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Micro- and Nanocellulose in Polymer Composite Materials: A Review

Abdoulhdi A. Borhana Omran, Abdulrahman A. B. A. Mohammed, S. M. Sapuan and 4 more

Polymers · 2021 · Review · CC BY

doi:10.3390/polym13020231

Abstract

The high demand for plastic and polymeric materials which keeps rising every year makes them important industries, for which sustainability is a crucial aspect to be taken into account. Therefore, it becomes a requirement to makes it a clean and eco-friendly industry. Cellulose creates an excellent opportunity to minimize the effect of non-degradable materials by using it as a filler for either a synthesis matrix or a natural starch matrix. It is the primary substance in the walls of plant cells, helping plants to remain stiff and upright, and can be found in plant sources, agriculture waste, animals, and bacterial pellicle. In this review, we discussed the recent research development and studies in the field of biocomposites that focused on the techniques of extracting micro- and nanocellulose, treatment and modification of cellulose, classification, and applications of cellulose. In addition, this review paper looked inward on how the reinforcement of micro- and nanocellulose can yield a material with improved performance. This article featured the performances, limitations, and possible areas of improvement to fit into the broader range of engineering applications.

Full text

From PubMed Central, U.S. National Library of Medicine, as current on Oct 26, 2026. Paragraph numbers are ours, so an answer can point at one.

1. Introduction

Petroleum-based synthesis polymers are non-degradable, with production, recycling, and disposal releasing toxic emissions into the environment. Cellulose offers excellent properties to minimize this damage by utilization as a filler in the manufacturing of either a synthesis matrix or a natural starch matrix. Cellulose is the main substance of a plant’s cell walls, helping plants to remain stiff and upright, hence, it can be extracted from plant sources, agriculture waste, animals, and bacterial pellicle. It is composed of polymer chains consisting of unbranched β (1,4) linked D glucopyranosyl units (anhydroglucose unit, AGU). Cellulose also possesses excellent mechanical properties, such as tensile and flexural strengths, tensile and flexural moduli, and thermal resistance, as well as low cost, due to its availability from different resources and abundance in nature, and degradability which is not obtainable in synthetic fillers, that makes it an excellent bio-filler for both synthesis or natural polymer matrixes. Cellulose needs to be extracted to be a useful substance. Cellulose extraction can be achieved via three approaches; mechanical, chemical, and bacterial techniques. Mechanical cellulose extraction comprises of high-pressurized homogenization, grinding, crushing, and steam explosion methods. Chemical extraction methods include alkali treatment, acid retting, chemical retting, and degumming.

Cellulose can be extracted in different sizes, depending on the intended application. Micro- and nanocellulose are the common sizes of cellulose used in industrial applications. Nanocellulose is divided into three types, (1) nanofibrillated cellulose (NFC), also known as nanofibrils or microfibrils or macrofibrillated cellulose or nanofibrillated cellulose; (2) nanocrystalline cellulose (NCC), also known as crystallites, whiskers, or rod-like cellulose microcrystals, and (3) bacterial nanocellulose (BNC), also known as microbial cellulose or biocellulose. The difference between microfibrillated cellulose and nanocrystalline cellulose is the fiber size distributions that are wide in microfibrillated cellulose and narrow or drastically shorter in nanocrystalline cellulose. Figure 1 depicts the structural difference between nanofibrillated cellulose and nanocrystalline cellulose. Similar to microfibrillated cellulose, bacterial cellulose also has a narrow size distribution and high crystallinity, except for its source, which is bacteria. According to Alain Dufresne and Chirayil et al., NCC and NFC are renowned not only for their biodegradation, superb properties, unique structures, low density, excellent mechanical performance, high surface area and aspect ratio, biocompatibility, and natural abundance, but also for their possibility to modify their surfaces to enhance their nano-reinforcement compatibility with other polymers due to the presence of abundant hydroxyl groups. Nanocellulose-based materials, also known as a new ageless bionanomaterial, are non-toxic, recyclable, sustainable, and carbon-neutral. NCC and NFC have demonstrated numerous advanced applications, including in the automotive industry, optically transparent materials, drug supply, coating films, tissue technology, biomimetic materials, aerogels, sensors, three-dimensional (3D) printing, rheology modifiers, energy harvesters, filtration, textiles, printed and flexible electronics, composites, paper and board, packaging, oil and gas, medical and healthcare, and scaffolding. In addition, macro and mesoporous nanocellulose beads also are utilized in energy storage devices. The cellulose beads act as electrodes that serve as complements to conventional supercapacitors and batteries, and depend on the properties of the cellulose (e.g., origin, porosity, pore distribution, pore-size distribution, and crystallinity). In consequence, the number of patents and publications on nanocellulose over 20 years have increased significantly from 764 in 2000 to 18,418 in 2020. In addition, this increment of more than 2300% over 20 years indicates that nanocellulose has become the advanced emerging material in the 21st century.

Applications of cellulose are vast and interfere with many fields concentrated on mechanical, medical, and industrial applications. In industry, cellulose is used as a filler for matrixes in the manufacturing of a degradable polymer. Cellulose is also used in packaging applications, tissue engineering applications, electronic, optical, sensor, pharmaceutical applications, cosmetic applications, insulation, water filtration, hygienic applications, as well as vascular graft applications. For instance, in Li-ion battery application, cellulose has been applied along with carbon nanotubes (CNT) as current collectors. Previously, the current collector in the battery used the conventional aluminum foil. From this point of view, cellulose paper-CNTs-based electrodes showed ~17% improvement in areal capacity compared to commercial aluminum-based electrodes. Another renowned application of cellulose is the implementation of electrospun cellulose acetate nanofibers for antimicrobial activity as mentioned by Kalwar and Shen. Moreover, cellulose is highly efficient in antitumor drug delivery. In this case, the application of carboxymethyl cellulose-grafted graphene oxide drug delivery system has a huge potential in colon cancer therapy. The cellulose can also be implemented in the oil and gas industry due to its large surface areas and high volume concentrations along with unique mechanical, chemical, thermal, and magnetic properties. Cellulose can also be used as additive and reinforcement for cross arm application in transmission towers in order to improve their mechanical properties and electrical resistance performance. To increase the base of potential applications, cellulose’s properties need to be more flexible in terms of modification and improvement to match the required properties of various applications. In this paper, we focused on the techniques of extracting micro- and nanocellulose, treatment and modification of cellulose, classification, and applications of cellulose. Thus, the objective of this paper is to demonstrate the recent state of development in the field of micro and nanocellulose, explain the process of extracting and modifying different types of cellulose, and highlight the properties improvement of cellulose through examples.

2. Classification of Cellulose

Cellulose can be classified into two types based on size, microcellulose and nanocellulose, while nanocellulose can be classified in three types: (1) nano- or microfibrillated cellulose (NFC)/(MFC), (2) nanocrystalline cellulose (NCC), and (3) bacterial nanocellulose (BNC). The advantage of extracting or isolating cellulose is that the nanocellulose can be obtained from microcellulose, producing different cellulose sizes in a compatible procedure.

Nanocellulose can be categorized into the family in nanofibrillated cellulose (NFC), nanocrystalline cellulose (NCC), and bacterial nanocellulose (BNC). The size of nanocellulose ranges from 5 nm to 100 nm. The difference between nanofibrillated cellulose (NFC) and microfibrillated cellulose (MFC) is that NFC is usually produced using a chemical pretreatment followed by a high-pressurized homogenization, while MFC is commonly yielded from chemical treatment. The sources of NFC or MFC are wood, sugar beet, potato tuber, hemp, and flax. The average diameter is 20–50 nm. Meanwhile, for nanocrystalline cellulose (NCC), the average range of NCC diameter and length are 5–70 nm and 100 nm, respectively. NCC can be extracted from several sources like plants (wood, cotton, hemp, flax, wheat straw, mulberry bark, ramie, avicel, and tunicin), algae and bacteria, and animals (tunicates). Another type of nanocellulose that can be produced from non-plant sources is bacterial nanocellulose (BNC). Using microorganisms in the industry of biopolymers is vital because such microorganisms exhibit rapid growth, allowing for high yields and year-round availability of the product. There are two main methods for producing BNC using microorganisms: static culture and stirred culture. Static culture employs the accumulation of a thick, leather-like white BNC pellicle at the air-liquid interface. The stirred culture synthesizes cellulose in a dispersed manner in the culture medium, forming irregular pellets or suspended fibers.

It is better to produce bacterial cellulose by static culture because previous studies have shown that bacterial cellulose produced from a static culture has higher mechanical strength and yields than those obtained from stirred culture. Moreover, stirred culture has a higher probability of microorganism mutations, which might affect BNC production. The disadvantage of a static culture is that it takes more time and a larger area of cultivation.

3. Microcellulose and Nanocellulose Extraction, Treatment, and Modification

Lately, natural fiber biopolymers have been significantly used as alternatives to synthetic polymer which negatively affected the environment. Green composites can be enrolled in many applications, such as automobiles, packaging, construction, building materials, furniture industry, etc.. Cellulose is the main component of several natural fibers, such as sugarcane bagasse, cotton, cogon grass, flax, hemp, jute, and sisal, and it can also be found in sea animals, bacteria, and fungi. Cellulose can be extracted in microscale with an excessive amount of mineral acids, the crystalline phases at nanometer range, with sizes of 10–200 μm, and the mean diameter of approximately 44.28 μm. The structure of microcellulose can be divided into microfibrillated cellulose or microcrystalline cellulose; microcrystalline cellulose has higher strength than the microfibrillated cellulose. Cellulose can also be extracted as nanocellulose size of nanocellulose fiber, which generally contains less than 100 nm in diameter and several micrometers in length. Plant natural fiber consists of cellulose and non-cellulose materials such as lignin, hemicellulose, pectin, wax, and other extractives. Therefore, in order to extract cellulose either as micro or nano, the non-cellulose materials must be removed. There are two common methods to remove non-cellulosic materials that were used by researchers, (I) acid chlorite treatment and (II) alkaline treatment. Depending on the conditions of extraction process and extraction technique, the crystalline region of the cellulose can significantly vary in size and aspect ratio. This usually results in the types of fibrils, crystalline, and particle sizes (micro- or nano-size). However, they are normally anisometric.

3.1. Cellulose Extraction Techniques

There are several types of cellulose production techniques such as mechanical treatment, chemical treatment, combination of chemi-mechanical process, as well as bacterial production of cellulose.

3.1.1. Mechanical Extraction

High-pressurized homogenization is one of the mechanical extraction techniques. High-pressurized homogenization is used for large-scale nanocellulose production by forcing the material through a very narrow channel or orifice using a piston under high pressure of 50–2000 MPa. This is an environmentally friendly method for nanocellulose isolation. However, there is a possibility for the occurrence of mechanical damage to the crystalline structure using this method. Another mechanical technique is grinding. Grinding is used to separate nanocellulose from fiber by applying shear stress on the fiber by rotating grindstones at approximately 1500 rpm. The heat produced by friction during the fibrillation process leads to water evaporation, which improves the extraction process. In addition, crushing is also used to extract cellulose fiber. This method is used to produce microcellulose in frozen places. The size of the produced cellulose ranges between 0.1 and 1 μm. This process can be used as a pretreatment prior to high-pressurized homogenization to yield nanocellulose. Steam explosion is utilized for the extraction of cellulose, which uses a low energy consumption method to extract the cellulose. Although it does not completely remove lignin, it can be considered a pretreatment. After applying this method, the obtained fiber needs mechanical modification.

3.1.2. Chemical Extraction

Chemical extraction procedures extract cellulose by using alkali retting, acid retting, chemical retting, chemical assisted natural (CAN), or degumming to remove the lignin content in the fibers. These treatments also affect other components of the fiber microstructure, including pectin, hemicellulose, and other non-cellulosic materials. One of the examples using the chemical extraction method is alkali or acid retting. This extraction method causes less fiber damage, while mechanical extraction is less costly. It is performed by heating, cleaning, and soaking the fiber in alkali or acid solution. This method has the ability to improve some properties of the fiber. Degumming, which is one of the chemical extraction processes that is developed to hold the ramie fiber’s shape, works by eliminating the gummy and pectin content. Another chemical technique is chemical retting. This procedure is used to reduce the lignin and water content in fibers. Chemical retting is able to remove more lignin compared to alkali and acid retting but is less effective in terms of eliminating moisture. A combination of the chemical and mechanical extraction methods can be applied to guarantee higher efficiency of lignin removal, where the mechanical processes usually are done after chemical treatment. Figure 2 shows the extraction of nanocellulose from lignocellulosic biomass via mechanical and chemical methods.

3.1.3. Bacterial Production of Cellulose

Bacterial cellulose is of similar molecular formula to plant origin cellulose, characterized by a crystalline nanofibrillar structure which creates a large surface area that can retain a large amount of liquid. There are many methods for bacterial cellulose preparation, including static, agitated/shaking, and bioreactor cultures. The results of macroscopic morphology, microstructure, mechanical properties of bacterial cellulose are different, depending on the preparation method. The static culture method enhances the accumulation of a gelatinous membrane of cellulose at the surface of the nutrition solution, whereas the agitated/shaking culture affects the asterisk-like, sphere-like, pellet-like, or irregular masses. The required properties and the applications dictate the selection of the appropriate preparation method. Producing cellulose-based bacterial resources gives higher critical surface tension and higher thermal degradation temperature while the cellulose extracted from plants via combination of the chemical and mechanical extraction methods has a hierarchical organization and semi-crystalline nature.

3.2. Cellulose Surface Treatment and Modification

Cellulose is the most abundant component that can be found almost exclusively in plant cell walls; it can also be produced by some algae and bacteria. The applications of natural biopolymers have extended in last recent years due to the improvement in the processes of surface treatment and modifications; these applications involve automobiles, construction, building materials like nano building blocks in composites, furniture industry, and optical applications. The cellulose fiber has two main drawbacks, (1) high number of hydroxyl groups that makes the product’s structure gel-like and (2) high hydrophilicity, which limit its uses in several applications. The purpose of the modification is to improve these two drawbacks to enhance the cellulose’s properties and broaden the applications of natural fiber.

To reduce energy consumption during cellulose manufacturing and to extract cellulose in an effective way, pretreatment needs to be carried out. The pretreatment can be either enzymatic pretreatment or TEMPO (2,2,6,6-tetramethylpiperidine-1-oxyl) pretreatment. Enzymatic pretreatment can be divided into cellobiohydrolases and endoglucanases, which show strong synergistic effects. TEMPO-mediated oxidation pretreatment is a treatment that must be performed in solution. TEMPO-mediated oxidation pretreatment improves the reactivity of cellulose, and the C6 primary hydroxyl groups of cellulose are converted to carboxylate groups via the C6 aldehyde groups. The main cellulose modifications are presented in the following subsections.

3.2.1. Molecule Chemical Grafting

The reaction mechanism in this technique is to improve the structure and properties of cellulose, and only happens on the cellulose chains located on the surface of the cellulose. The limitation on the extent of acetylation (ester bonds are formed between cellulose and cyclodextrins) lies in the susceptibility and ease to maintain the surface; however, this technique does not make the cellulose fully dissolved because of the complex network formation.

3.2.2. Surface Adsorption on Cellulose

The adsorption on the surface of cellulose is usually done by using surfactants. There are many types of surfactants, such as fluorosurfactant, e.g., perfluorooctadecanoic acid used to coat cellulose, cationic surfactant, and polyelectrolyte solution. Surfactants improve hydrophobic behavior; however, they might also change the physical properties and produce some cracks that possibly make absorption of water and moisture occur.

3.2.3. Direct Chemical Modification Methods

The properties of cellulose, such as its hydrophilic or hydrophobic character, elasticity, water sorbency, adsorptive or ion exchange capability, resistance to microbiological attack, and thermal resistance are usually modified by chemical treatments. The main methods of cellulose chemical modification are esterification, etherification, halogenations, oxidation, and alkali treatment. The chemical modifications methods of cellulose are the best methods to achieve adequate structural durability and an efficient adsorption capacity.

3.2.4. Cellulose Grafting

Grafting on cellulose by attaching or adding the particles of molecules covalently to the cellulose can be done by either using coupling agents or activating the cellulose substrates. Vinyl monomers grafting on cellulose can be performed in homogeneous or heterogeneous medium. When polyhydroxybutyrate (PHB) is grafted with cellulose, it improves the properties of the cellulose in terms of crystallinity, flexibility, and the chemically linking of the fibers with the matrix. Figure 3 illustrates the general mechanism of peroxide radical initiated grafting of PHB onto cellulose. Polyethylene glycol (PEG) and aminosilane are also used as grafting materials, where these materials increase the cellulose polarity to have better compatibility with the polymer.

4. Mechanical Properties of Microcellulose and Nanocellulose

Developing eco-friendly, sustainable, and easily available materials has gained great attention in recent years, due to environmental issues and the depletion of petroleum. Exploring alternatives for petroleum-based polymers by extracting cellulose from natural resources like plants, animals, and bacteria provides us with an excellent opportunity to save the environment. Nevertheless, this natural cellulosic polymer has some property shortages. Improving its properties extends the abilities of using natural fiber in wider applications. Usually, improving mechanical properties results in enhancements in the other properties, such as thermal and chemical properties. This is due to the modifications applied to the natural fiber improving the homogeneity between the particles, hence creating a good chemical bonding. The important mechanical tests to assess the enhancements resulted from the modifications are tensile strength, tensile modulus, flexural strength, flexural modulus, elongation, and stiffness.

4.1. Tensile Strength

It is essential to know the maximum load that the material can withstand before failure prior to application in any field. Adding microcellulose to polymers has improved the tensile strength of many polymers, e.g., adding microcrystalline cellulose (MCC) prepared from cotton fabric waste to poly(vinyl chloride) film enhanced the tensile strength with the increase of MCC content. When MCC was added to poly(vinyl alcohol), the tensile strength continued to increase with MCC addition. The maximum tensile strength was achieved with 10% of MCC load; beyond that value, the tensile strength started to drop gradually. The composite of polypropylene (PP)/MCC revealed an insignificant decrease in the tensile strength; this problem can be solved by using coupling agents, such as aminopropyltriethoxysilane and maleic anhydride-grafted polypropylene (MAPP). In the case of using coupling agents, the tensile strength was improved, giving a chance to add more MCC. The composite of hydroxypropyl starch/MCC showed improvement in the tensile strength, where the maximum load was 6% of MCC, and the tensile strength started to decrease when adding more MCC. MCC-reinforced polypropylene composites using maleic anhydride polypropylene (MAPP) as a coupling agent improved the tensile strength by 27% higher than that of the composite containing only MAPP. Reinforcing nano-clay with MCC improved the tensile strength of the composite at 7.5 wt% nano-clay. Incorporation of nano-cellulose into gelatin and starch matrices showed that increasing nanocellulose composition to 10% led to increasing the tensile strength. In the composite of poly(vinyl alcohol)/NCC and nanosilica, the addition of NCC and nanosilica to poly(vinyl alcohol) improved the tensile strength. Nanocellulose reinforced unsaturated polyester (UPR) revealed significant increment of tensile strength with the addition of 0.5–3 wt% of NCC with maximum tensile strength obtained for 0.5 wt%. In another study, the composite of chitosan reinforced with NCC improved the tensile strength result until it reached 245 MPa.

4.2. Flexural Strength

Flexural strength is defined as the maximum bending stress that the material can withstand before yield. Adding modified MCC to cement mortar was found to improve the flexural strength by double. The composite of MCC and cementitious improved the cementitious by 19.2% with 1% of MCC addition. Using nutshell with MCC to fill high-density polyethylene also made remarkable improvements in the flexural strength of the high-density polyethylene. In the composite of polymethylmethacrylate (PMMA) and nanocrystalline cellulose (NCC), the addition of NCC improved the flexural strength to around 3 MPa. The addition of NCC to cement paste showed 20–30% improvement in flexural strength, with only 0.2% of NCC. The composite of NCC to epoxy nanocomposites exhibited a 20% enhancement in the flexure strength.

4.3. Elastic Modulus (Young’s Modulus)

To measure the stiffness of a material, we need to measure the tensile modulus. The addition of MCC to commercial acrylic adhesive increased the modulus of the composition. Solution casting of MCC and organophilic silica (R972) applied as a filler to poly(lactic acid) (PLA) revealed an improvement in the tensile modulus. Polycaprolactone/MCC/wood flour composites exhibited lower tensile modulus, and the maximum tensile modulus was gained from polycaprolactone/wood flour without MCC.

When the NCC was extracted from MCC and added to polyamide 6, the tensile modulus of the composite increased for almost 10 times that of the polyamide 6′s. The montmorillonite (MMT)/NCC reinforcing polylactic acid (PLA) hybrid showed an improvement in the tensile modulus by increasing the load of NCC. When NCC was coated on woven jute/green epoxy composite, enhancement in the tensile modulus occurred.

4.4. Flexural Modulus

Like all materials, we need to test the resistance of bending of the newly developed material. When microcrystalline cellulose (MCC) was used as a filler to nylon 6, the filler loading improved the flexural modulus from 2.6 GPa with neat nylon 6 to 3.8 GPa with 20% of MCC loading. MCC was also used as reinforcement material to cementitious composites and revealed 106% enhancement in the flexural modulus as a result of adding MCC. The addition of epoxidized citric acid to polylactide/MCC showed the highest result of flexural modulus (4.7 MPa) at 3% of MCC, which was 3.3 MPa before adding MCC. For nanocellulose used as reinforcement of epoxy composite, the addition of NCC increased the flexural modulus until it reached 3.1 GPa at 0.75% of NCC; adding more NCC resulted in the drop of the flexural strength. Poly(lactic acid) (PLA) reinforced with NCC exhibited 106% improvement in terms of flexural strength.

4.5. Elongation at Break

The deformation that occurs before a material eventually breaks needs to be measured to know the ductility of the material. The addition of MCC extracted from waste-cotton fabric to the hybrid of poly(lactic acid), poly(butylene succinate) revealed acceptable elongation while the other properties were improved. When regenerated MCC was added to epoxidized natural rubber blend film, the elongation was improved by 39% at 20 wt% loading of MCC. Adding NCC extracted from MCC to poly(lactic acid) for packaging applications showed improvement in elongation, reaching 205%. Phosphorylated nanocellulose fibrils added to PVA nanocomposites showed a significant drop in elongation at break encountered with general improvements in the other properties.

5. Cellulose Aging Resistance

It is known that polymer and plastic materials tend to age under the interaction of oxygen and heat; this aging leads to scrapping. Therefore, resistance to aging is an essential feature of cellulose. The importance of aging resistance depends on the applications that the materials will be used for. Usually, when the thermal and mechanical properties are improved, the aging resistance will also be improved. Enrolling cellulose in polymers gives excellent potential to enhance the polymer’s aging resistance. Under normal conditions, the aging resistance can be assessed by tracking the changes in their interfacial shear strength (IFSS) results.

It is clear that adding ash and other non-cellulosic components to the biopolymer reduces the properties of the material, whether these properties are mechanical or thermal, but it has been found that adding ash to the biopolymer improves the aging resistance of the biopolymer. Using cellulose ash as contribution filler improved the aging resistance of the asphalt mixtures from 45.3% to 48.6%. Adding charcoal ash coconut shell to bitumen also improved the aging resistance of the bitumen.

The composite of polylactic acid (PLA)/linear low-density polyethylene (LLDPE)/microcrystalline cellulose (MCC) fiber revealed a good aging resistance. The bacterial cellulose used to make electrical insulating paper enhanced its aging resistance. The addition of nanocrystalline cellulose/attapulgite (AT) to polypropylene (PP) improves aging resistance, thermal stability, and gas barrier properties. However, the addition of NCC/AT to PP decreased the mechanical properties and the degradation degree of PP. The composition of nanocrystalline cellulose and potato starch showed improvement in the aging resistance after bleaching the pulps. Comparing the aging resistance of aramid nanofiber (ANF) and nanocrystalline cellulose revealed that ANF has better aging resistance than NCC. The NCC boosted the carbon in ionic liquid supercapacitors and improved the aging resistance of the carbon/NCC. This improved the composite’s stability even after three months. Removing moisture and water content exhibited enhancement in the aging resistance of the biopolymer. The nanocrystalline cellulose with copper-based dye-sensitized solar cells demonstrated great improvement in the percentage of aging resistance of the composite.

There are three methods to improve aging resistance; these methods are (1) polyhedral oligomeric silsesquioxane, in which some materials can be used to improve the fiber’s resistance, such as modified polyhedral oligomeric silsesquioxane. When poly(p-phenylene benzobisoxazole) nanocomposite fiber was modified by using polyhedral oligomeric silsesquioxane, the aging resistance of poly(p-phenylene benzobisoxazole) was improved. (2) Polyhedral oligomeric silsesquioxanes (POSS) grafting, using 3 aminopropyltrimethoxysilane (APTMS) as a bridging agent. Polyhedral oligomeric silsesquioxanes and silane agent used to graft ZnO nanowires (NWs) onto poly(p-phenylene benzobisoxazole) (PBO) fibers enhanced the aging resistance of the PBO and improved the other properties. (3) Polyhedral oligomeric silsesquioxane (POSS) derivatives in an ionic liquid 1-allyl-3-methylimidazolium chloride (AmimCl). The dispersion of POSS (both aminophenyl or nitrophenyl groups (POSS-AN, NH2:NO2 = 2:6)) in cellulose matrix, POSS-AN nanoparticles were uniformly dispersed in cellulose at nanoscale, the POSS-AN provided better compatibility in both the AmimCl and cellulose/POSS nanocomposite films and increased the aging resistance.

6. Comparison between Plant-Derived Nanocellulose and Bacterial Nanocellulose Fibers

There are differences between plant-based and bacteria-derived nanocellulose fibers. Bacterial nanocellulose possesses higher critical surface tension and higher thermal degradation temperature while the cellulose extracted from plant has hierarchical organization and semi-crystalline nature. The cellulose-based plant is available while the bacterial cellulose is limited, and the bacterial cellulose has a higher purity and crystallinity degree than the plant cellulose. Cellulose from plants takes a longer time to be harvested, depending on the plants’ growing duration. Other factors, e.g., plant and soil types, nutrients, climate conditions, and susceptibility to insect pest infestation, also contribute to variances between plant-originated cellulose fibers and bacteria-derived cellulose fibers. The plant-derived cellulose compositions are cellulose, lignin, hemicellulose, and ash, where the nanocellulose extraction process requires energy for harvesting and lignin removal. The drawback of harvesting is that it might cause damage to the environment rather than saving it. On the other hand, the cellulose extracted from bacteria usually needs only days to grow. After cell removal, the cellulose can be extracted in a pure mode. This method demonstrates energy consumption in the sterilization of nutrients and bacterial cellulose and the cell removal processes, which negatively impacts the environment by increasing the air pollution. Figure 4 illustrates the relationship between different kinds of nanocelluloses.

7. Applications of Nanocellulose

Applications of any material depend on the appropriateness between the properties of the material and the application specifications and standards. Whenever the properties of any material are improved and are easy to modify, the material will cover more applications. In this case, the improvement in the properties of nanocellulosic materials will extend their applications, where the nanocelluloses applications can be divided by their types. Bacterial nanocellulose’s main applications in the medical field are wound, burn, and ulcer dressings. It is also used in packaging, tissue engineering, electronic, optical, sensor, and catalysis applications; whereas NFC and MFC are used as additives in the paper-making process, coating, medical, pharmaceutical, cosmetic, hygienic, barrier material, high-temperature thermal insulation, and chronic wound healing applications. Because of the small diameter of NCC, it is useful in the medical field applications, especially in the vascular graft, electronics, catalysis, packaging applications, synthetic plastic or polymers, fuel cells, filtration, catalysis, tissue engineering, solar cells, and lithium-ion batteries. The NCC bionanocomposites can also be implemented in fire extinguishers and automotive components due to their high thermal stability and tensile strength. The applicability of any composites is decided by its controlled durability under the circumstances it is being used. Nanocellulose has a great developing direction on flexible electronics, 3D printing technologies, and smart materials, as well as the medical and energy field applications. Moreover, microcrystalline cellulose is used in many applications, such as abrasives in cosmetics, absorbent, anti-caking, bulking, and aqueous viscosity increasing agents, binder, emulsion stabilizer, slip modifier, and texturizer.

Designing biocomposite-based cellulose has numerous challenges due to the large variety of cellulosic fibers, polymers, and manufacturing processes, since there are a wide variety of types of reinforcements, dissimilar fiber geometry, and many possibilities for the orientation and fiber arrangement being used especially in large scale design. The sustainability of the environment directly affects the economic development. By increasing the area of cellulose application, the agriculture of cellulose sources will improve, which improves other industries such as agriculture machines industry. Moreover, the development of a growing industry like biocomposites creates more jobs and sub-industries.

8. Cellulose Fiber for Injection Molding

Injecting molding is the processing technique (co-extrusion and melt processing techniques) that is used for natural fiber, similar to the synthesis polymers injection methods. This method is able to produce parts with very precise dimensions at very low cycle times. The approach used with cellulose is usually the foam injection mold, because it can be used with many different-sized parts and densities to produce a high strength and lightweight molded parts. Many applications require thicker walls of mold than standard injection molding due to producing products effectively. However, the structural foam process allows for a quicker process and lower cycle time on thicker parts and is able to produce complex three-dimensional geometries. Polymeric foams can be prepared by different techniques, such as extrusion, batch, and bead foaming, as well as foam injection molding. Microcellular injection molding technology, also known as the (MuCell) process, is a type of foam injection molding technique that produces parts with excellent dimensional stability using a lower injection pressure, which means lower cost. This technique is typically used to produce nanocellulose. Injecting cellulose nanocrystals with biodegradable poly(lactic acid) foam improved the composite properties at a low cost. Microcellular injection molding technology can also be used with cellulose nanofibers. This technique that inject-molded polypropylene foams by introducing hydrophobic-modified cellulose nanofibers has improved the dispersion of cellulose nanofibers in the composite. There are three types of foaming processing technologies.

8.1. Batch Foaming Processing

Batch-foaming is a discontinuous foaming process that shows good reproducibility due to the precise process control. It is qualified to be employed to investigate the foaming behavior of polymers and polymer systems and is also used in industrial applications. In this method, the polymer is placed in a high-pressure chamber saturated with inert gas, then, the polymer sample is put under heat and pressure to lower the gas solubility of the polymer.

8.2. Extrusion Foaming Processing

Foam extrusion is a continuous process of high industrial relevance. It allows producing semi-finished products with foam densities below 50 kg/m3. The temperature must be minimized in this method to avoid emissions during the extrusion foaming processing. This method can be performed with either chemical foaming agents (chemical blowing agents (CBAs)) or physical blowing agents (PBAs).

8.3. Injection Foam Molding Process

Foam injection molding processing is a composite material produced when a polymer, usually thermoset or thermoplastic, is combined with either an inert physical gas, such as nitrogen, or a chemical blowing agent during the molding process. This method is used to fabricate three-dimensional shapes of polymers using either chemical foaming agents (chemical blowing agents (CBAs)) or physical blowing agents (PBAs).

9. Nanocellulose Reinforcing Polymer Composite

In general, nanocellulose can be reinforced with synthetic polymer with significantly different chemical and or physical properties when reinforced. Later, the combination of both materials would produce a material with characteristics different from the individual components. The term is usually referred to nanocomposites, which are generally divided into nanocrystalline cellulose (NCC) filled synthetic polymers and nanofabrillated cellulose (NFC) filled synthetic polymers. The addition of nanocellulose has significantly improved synthetic polymer properties, such as tensile strength and thermal conductivity. Synthetizing metal-organic framework (MOF) powders on nanocellulose template offered conventional with excellent mechanical flexibility and porosities as well as shifted the balance of growth and nucleation for synthesizing MOF microcrystals. This low-cost production pathway is capable of transforming MOF into flexible and shapeable form and thus range their applications in more wide fields. Table 1 exhibits some examples of nanocrystalline cellulose-filled synthetic polymer and the effect of nanocellulose reinforcement.

The issue of reinforcement of nanocrystalline cellulose with synthetic polymer has received considerable critical attention. Roohani et al. studied the influence of NCC contents on the morphological, dynamic mechanical, and tensile properties of cotton NCC reinforced with copolymers of polyvinyl alcohol and polyvinyl acetate. For dynamic mechanical analysis results, glass transition temperature rose significantly with the addition of cotton NCC due to the formation of a water layer at the interface, which caused its matrix to become less plasticized by water. On top of that, the tensile strength and Young’s modulus seemed to increase with the addition of cotton NCC. However, the humidity elevation caused a significant decrease in the tensile modulus due to the glass transition temperature changes towards lower values, below the room temperature. Cao et al. also looked at the effect of NCC content but with differences in NCC sources and its polymer matrix. They studied the NCC contents of flax fillers and tested for tensile, dynamic mechanical, and thermal gravimetric properties of flax NCC to reinforce nitrile composites. The composites performed an increase of tensile strength and storage modulus with the increase of filler content. Moreover, the rise in flax NCC also resulted in glass transition temperature (Tg) of the composites that was shifted from 10.8 to 17.2 °C. In terms of thermal gravimetric analysis, the degradation temperature corresponding to flax NCC in nanocomposites was significantly higher than pure flax NCC.

In addition, Mahendra et al. carried out a study on the effect of oil palm NCC and TEMPO-oxidized nanocellulose on the compatibility of polypropylene/cyclic natural rubber (PP/CNR) blends. The result showed that the addition of NCC enhanced the mechanical properties of the polymer nanocomposites compared to the neat polymer. Moreover, the improvement of NCC nanocomposites was also observed as the result of interphase surface tension and thermal stability. A recent study was carried out by Dai et al. on the potential of the green method to fabricate green pH/magnetic sensitive hydrogels based on pineapple peel crystalline nanocellulose (rPPNc) and polyvinyl alcohol. The rPPNc improved the thermal stability, swelling ability, naringin loading, and entrapment efficiency of the hydrogels. A study conducted by Jain and Pradhan stressed that the mechanical properties of sisal NCC-rubber composites stress strain graphs displayed a ductile fracture behavior, where a peak yield stress occurred followed by necking and cold drawing. The increase of sisal NCC fillers within 5–10% in the nanocomposites would increase about 0.365 to 0.360 MPa compared to pure rubber. The process of extraction of NCC fillers from sisal leaves in this research is the acid hydrolysis method. However, the tensile strength of sisal nanocomposite was less than the sisal fiber composite due to the lack of homogeneity in mixing sisal NCC in latex and weak bonding between cellulose and latex.

There have been several investigations into the causes of the effect of nanofibrillated cellulose when reinforced with polymer. Karmaker et al. implemented solution casting to fabricate PVA-gelatin films with the addition of NCC fillers from softwood kraft pulp. The addition of nanofiller showed drastic changes with its mechanical and thermal properties. Those tensile moduli and strength were significantly increased as gelatin and NCC fillers were added in the nanocomposite, which contributed to low elongation at break. Moreover, the addition of NCC filler in the PVA-gelatin nanocomposites reduced the moisture absorption as their thermal properties was improved. The surface morphology of the nanocomposite permitted better crystallinity due to the existence of glycosidic bonds in cellulose structure. Another study executed by Xu et al. found that tunicin cellulose had potent effects in terms of mechanical and thermal properties in epoxy nanocomposites. The storage modulus and Tg of the nanocomposites were significantly enhanced when the increase of tunicin NCC filler. For instance, with 15 wt% of tunicin NCC fillers, the storage modulus was increased by 100% relative to pure epoxy, while their Tg increased to 75.5 °C. Moreover, the inclusion of NCC in epoxy nanocomposites tremendously increased the tensile strength up to 60 MPa due to good surface adhesion NCC filler with epoxy matrix. In addition to that, another well-known nanofiller is nanofibrillated cellulose (NFC). It is commonly used in packaging and automotive applications due to its enhanced thermal, mechanical, and crystallinity properties. Table 2 summarizes the effect of NFC in synthetic polymer matrix composites.

As mentioned by Zhang et al., bagasse pulp NFC was blended with γ-aminopropyltriethoxysilane treated aluminum nitride nanosheets (TAlN). The results found that dispersibility of the AlN nanosheets in the NFC substrate was enhanced because of the silane treatment. This happened due to the treatment that lowered scattering between the AlN and NFC interfaces, which induced better thermal conductivity. The new material has shown enhancement of the mechanical properties of nanocellulose reinforced synthetic polymer composites. Pandurangan and Kanny evaluated morphological and curing properties of banana NFC-filled epoxy composites. They stressed that the banana NFC fillers acted as a catalytic curing agent by increasing the cross-link density during gelation of epoxy. Moreover, good dispersion of the banana NFC particles in the matrix contributed to 10% increase in tensile strength and 26% increase in elongation at 3 wt% of NFC filled epoxy nanocomposite. Along with the mechanical properties, nanocomposite film’s dynamic mechanical properties were improved, especially at 2–3 wt% of NFC filler. Water uptake results suggested that the water uptake of the NFC filled epoxy nanocomposites was reduced as with higher concentration of NFC particles. The same study was also conducted by Nair et al. by using western red cedar NFC with high residual lignin. They found a significant increase in terms of mechanical, thermal, and water barrier properties of the high residual lignin NFCs nanocomposite.

Recently, studies on nanocellulose reinforced epoxy have been performed by researchers in many fields such as aerospace, automotive, and marine construction. Vu et al. carried out a study on the influence of micro/nano white bamboo fibrils on the physical characteristics of epoxy resin reinforced composites. They found that the inclusion of the NFCs increased the flexural and tensile behaviors, fracture toughness, and thermal properties of the nanocomposite. The presence of white bamboo NFCs enhanced the tensile and flexural moduli, which exhibited improvement in the nanocomposite’s stiffness. Another study by Junior et al. also looked at the impact of the nanofibrillation of bamboo pulp but with a slight difference in focus from Vu et al.. They studied the nanocomposite based on starch/PVA blend and tested for thermal, structural, and mechanical properties. The results indicated that the higher NFC filler encouraged better homogeneity, cohesion, and more compact structure, which promoted larger crystals in the nanocomposite. In addition, the tensile strength and elongation at break improved at 24 and 15% as compared to the control blend.

10. Nanocellulose Reinforcing Biopolymer Composite

As nanocellulose is used to reinforce synthesis polymer, it is also employed to reinforce biopolymer from natural resources to improve the properties of the natural polymer, such as polylactic acid (PLA), polyhydroxy acids (PHA), polyhydroxybutyrate (PHB), polybutylene succinate (PBS), and starch biopolymer. Table 3 and Table 4 illustrate some examples of NCC and NFC reinforced biopolymer and show the effects of NCC as well as NFC fillers.

Vaezi et al. evaluated the effect of coatings on bionanocomposites of cationic starch/cotton NCC in the application of paper packaging. They discovered that the increase in NCC nanoparticle loading increased the tensile strength, oil resistance, and air resistance of the coated paper, with the optimized amount of 5 wt% of NCC nanoparticles. In terms of physical properties, the water absorption of the coated paper decreased by 50% at 5 wt% NCC concentration. Jiang et al. performed a study regarding the impact of eggshell NCC filler on the overall properties of corn starch films. They showed that the inclusion of the fillers noteworthily boosted the tensile behavior, thermal stability, oxygen, and water vapor barrier properties compared to the pure corn starch film. This happened due to the inductive effect between the C–C bonds on cornstarch skeleton and the O–C–O bond on calcium carbonate in the eggshell nanofiller, which later contributed to strong interaction and biocompatibility between the two components.

Another well-known source of NCC filler reinforced in biocomposites is orange peel. It has been widely used in the packaging industry in order to develop high durability biofilm. A study conducted by Fath et al. found that orange peel NCC filler had good dispersion in their matrix. The filler also acted as a compatibilizer, which improved the physical interaction between NCC filler-starch films. The inclusion of the fillers also decreased the water vapor transmission rate, especially at 2 wt% concentration. A research study carried out by Nasution et al. measured the effect of filler loading and co-plasticizer addition on rattan NCC-filled sago starch bionanocomposite. They stressed that the lowest water absorption rate was 9.37% at an additional of 3 wt% rattan NCC filler and 10 wt% acetic acid as compared to pure films.

For the effect of acetyl treatment of starch NCC filler to overall properties of the PLA based nanocomposites, the nanocomposites of 1 and 3 wt% fiber loadings of untreated and treated fiber as well as control were tested for the morphological, barrier, and mechanical properties. It was observed that the PLA nanocomposites with treated starch NCC filler provided better filler dispersion and interaction with the matrix. Moreover, it also had a high potential to improve the oxygen barrier and tensile properties of PLA nanocomposite. Syafri et al. studied the influence of sonication time on thermal stability, biodegradation, and moisture absorption performance of water hyacinth NCC/bengkuang starch bionanocomposites. The result showed that the bionanocomposite vibrated for 60 min had the highest thermal stability and presented with low moisture absorption capability. Furthermore, the 60 min-vibrated nanobiocomposite had low porosity formation and a coarse surface. The bionanocomposite also had a slow biodegradation rate, which is highly suitable for the application of food packaging bags. As well as NCC-filled bionanocomposites, NFC filler can be implemented in a biopolymer matrix to form durable composite films. Table 4 illustrates some examples of NFC-filled biopolymer composite and shows the effect of NFC fillers.

A study conducted by Lomelí-Ramírez et al. studied the mechanical properties of dried and hydrated Agave tequilana Weber NFC filled in corn starch bionanocomposite. It showed tremendous improvement in terms of tensile, flexural, and impact performance due to a small amount of 1 wt% of NFC filler. This could be attributed to an increase of stiffness caused by NFC filler in the bionanocomposite. Pitiphatharaworachot et al. evaluated the bamboo holocellulose NFC fillers reinforced in thermoplastic starch (TPS) bionanocomposites. The NFC filler was prepared from bamboo holocellulose powder using TEMPO-mediated oxidation. They established that bamboo NFC filler was individually dispersed with TPS matrix, which subsequently contributed to less water uptake, high transparency, better tensile strength, and better modulus as compared to pure TPS films. The optimum concentration of NFC filler was 1.5 wt%.

In accordance with Huang et al., they carried out research to compare the effects of various modification methods (silane and malic acid treatment) on physical and chemical properties of cassava-filled cassava starch bionanocomposites. In their findings, modified NFC filler significantly improved dispersibility with those fibrils that were detached from each other. Morphologically, they formed three-dimensional network structures with no occurrence of coarse fiber aggregation. The inclusion of modified cassava NFC filler improved the tensile strength, hydrophobicity, and water vapor transmission coefficient of the bionanocomposite films by 1034%, 129.4%, and 35.95%, respectively.

Furthermore, De Almeida et al. performed a study on thermal, physical, and mechanical behaviors of regular and waxy corn starch films reinforced with eucalyptus NFC filler. The moisture content, water solubility, and water vapor permeability were significantly reduced by the presence of NFC filler for both regular and waxy starch films. It was possible to observe that the addition of NFC filler enhanced the thermal and tensile properties of the bionanocomposite since only 1% of the suspension was added. Balakrishnanan et al. studied the effect of filler loading on morphological, transport property, and viscoelastic polymer chain confinement of pineapple leaf NFC filled in thermoplastic potato starch bionanocomposites. They confirmed that the polymer chain confinement around the NFC filler has excellent dispersion and superior interaction between matrix and NFC filler. The bionanocomposites obey the pseudo-fickian property. In terms of barrier properties, the addition of NFC filler at 3 wt% concentration also resulted in its enhancement. However, further increased filler content would depreciate the properties due to the agglomeration of fiber.

Another study by Tajik et al. evaluated the impact of cationic starch in the presence of NFC filler on the structural, optical, and strength properties of paper. They found retention and reinforcing effects of the additives on the paper network. In this manner, the mechanical properties such as tensile and burst strengths were drastically increased as the increasing levels of the additives were up to 33% and 23%, respectively, for 0.6 CS/2% NFCs filler paper bionanocomposites. The bagasse NFCs filler also contributed to the improvement of retention and drainage of pulp at lower levels because of the interaction between filler and starch polymer. In addition, a higher concentration of the nanofillers improved the brightness of paper. Research work by Soni et al. blended TEMPO-oxidized NFCs fillers inside three modified starches, namely hydroxypropyl starch (HPS), acetyl starch (AS), and acetyl oxidized starch (AOS), to evaluate their mechanical strength and durability in water. They discovered that TNFC/acetyl oxidized starch biofilm displayed less water swelling and improved wet tensile properties due to the formation of hemiacetal between nanofiller and starch polymer. TNFC/HPS biofilm illustrates the highest wet stiffness with the minimum swelling in water.

11. Conclusions

There is no escape from stopping or at least minimizing the usage of non-degradable petroleum-sourced materials to protect the environment. Micro- and nanocellulose are good alternatives to manufacture composites with either natural starch or synthetic matrix. The cellulose classification and extraction methods have been highlighted. The development of composite materials containing cellulose has improved in terms of mechanical, thermal, and aging resistance. Further improvements to enhance the dispersion and compatibility of cellulose have been discussed. These advancements have been highlighted to reveal the high potential of cellulose-based composite for a large number of applications. The increment of using plastic materials in the world requires more development in bioplastic materials to replace petroleum-based synthesis polymers. Processes of extracting, isolating, and injecting cellulose require more studies and adjustments to improve the properties of the biopolymers and to have broader applications.

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    Jeon S., Yoo Y.M., Park J.W., Kim H.J., Hyun J. Electrical conductivity and optical transparency of bacterial cellulose based composite by static and agitated methods. Curr. Appl. Phys. 2014;14:1621-1624.

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    Tyagi N., Suresh S. Production of cellulose from sugarcane molasses using Gluconacetobacter intermedius SNT-1: Optimization & characterization. J. Clean. Prod. 2016;112:71-80.

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    Huang X., Netravali A. Biodegradable green composites made using bamboo micro/nano-fibrils and chemically modified soy protein resin. Compos. Sci. Technol. 2009;69:1009-1015.

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    Mohammed L., Ansari M.N.M., Pua G., Jawaid M., Islam M.S. A Review on Natural Fiber Reinforced Polymer Composite and Its Applications. Int. J. Polym. Sci. 2015;2015:243947.

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    Nurazzi N.M., Khalina A., Sapuan S.M., Ilyas R.A. Mechanical properties of sugar palm yarn/woven glass fiber reinforced unsaturated polyester composites: Effect of fiber loadings and alkaline treatment. Polimery. 2019;64:12-22.

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    Mazani N., Sapuan S.M., Sanyang M.L., Atiqah A., Ilyas R.A. Design and fabrication of a shoe shelf from kenaf fiber reinforced unsaturated polyester composites. Lignocellulose for Future Bioeconomy. 2019;315-332.

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    Nurazzi N.M., Khalina A., Sapuan S.M., Ilyas R.A., Rafiqah S.A., Hanafee Z.M. Thermal properties of treated sugar palm yarn/glass fiber reinforced unsaturated polyester hybrid composites. J. Mater. Res. Technol. 2020;9:1606-1618.

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    Norizan M.N., Abdan K., Ilyas R.A., Biofibers S.P. Effect of fiber orientation and fiber loading on the mechanical and thermal properties of sugar palm yarn fiber reinforced unsaturated polyester resin composites. Polimery. 2020;65:34-43.

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    Ayu R.S., Khalina A., Harmaen A.S., Zaman K., Isma T., Liu Q., Ilyas R.A., Lee C.H. Characterization Study of Empty Fruit Bunch (EFB) Fibers Reinforcement in Poly(Butylene) Succinate (PBS)/Starch/Glycerol Composite Sheet. Polymers. 2020;12:1571.

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    Morán J.I., Alvarez V.A., Cyras V.P., Vázquez A. Extraction of cellulose and preparation of nanocellulose from sisal fibers. Cellulose. 2008;15:149-159.

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    Jumaidin R., Khiruddin M.A.A., Asyul Sutan Saidi Z., Salit M.S., Ilyas R.A. Effect of cogon grass fibre on the thermal, mechanical and biodegradation properties of thermoplastic cassava starch biocomposite. Int. J. Biol. Macromol. 2020;146:746-755.

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    Sari N.H., Pruncu C.I., Sapuan S.M., Ilyas R.A., Catur A.D., Suteja S., Sutaryono Y.A., Pullen G. The effect of water immersion and fibre content on properties of corn husk fibres reinforced thermoset polyester composite. Polym. Test. 2020;91:106751.

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    Jumaidin R., Saidi Z.A.S., Ilyas R.A., Ahmad M.N., Wahid M.K., Yaakob M.Y., Maidin N.A., Rahman M.H.A., Osman M.H. Characteristics of Cogon Grass Fibre Reinforced Thermoplastic Cassava Starch Biocomposite: Water Absorption and Physical Properties. J. Adv. Res. Fluid Mech. Therm. Sci. 2019;62:43-52.

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    Aisyah H.A., Paridah M.T., Sapuan S.M., Khalina A., Berkalp O.B., Lee S.H., Lee C.H., Nurazzi N.M., Ramli N., Wahab M.S., et al. Thermal Properties of Woven Kenaf/Carbon Fibre-Reinforced Epoxy Hybrid Composite Panels. Int. J. Polym. Sci. 2019;2019:5258621.

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    Jumaidin R., Ilyas R.A., Saiful M., Hussin F., Mastura M.T. Water Transport and Physical Properties of Sugarcane Bagasse Fibre Reinforced Thermoplastic Potato Starch Biocomposite. J. Adv. Res. Fluid Mech. Therm. Sci. 2019;61:273-281.

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    Trache D., Hussin M.H., Hui Chuin C.T., Sabar S., Fazita M.R.N., Taiwo O.F.A., Hassan T.M., Haafiz M.K.M. Microcrystalline cellulose: Isolation, characterization and bio-composites application—A review. Int. J. Biol. Macromol. 2016;93:789-804.

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    Kargarzadeh H., Ioelovich M., Ahmad I., Thomas S., Dufresne A. Methods for Extraction of Nanocellulose from Various Sources. Handb. Nanocellulose Cellul. Nanocompos. 2017;1-51.

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    Kian L.K., Jawaid M., Ariffin H., Alothman O.Y. Isolation and characterization of microcrystalline cellulose from roselle fibers. Int. J. Biol. Macromol. 2017;103:931-940.

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    Phanthong P., Reubroycharoen P., Hao X., Xu G., Abudula A. Nanocellulose: Extraction and application. Carbon Resour. Convers. 2018;1:32-43.

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    Haafiz M.K.M., Hassan A., Zakaria Z., Inuwa I.M. Isolation and characterization of cellulose nanowhiskers from oil palm biomass microcrystalline cellulose. Carbohydr. Polym. 2014;103:119-125.

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    Sabaruddin F.A., Tahir P.M., Sapuan S.M., Ilyas R.A., Lee S.H., Abdan K., Mazlan N., Roseley A.S.M., Abdul Khalil H.P.S. The Effects of Unbleached and Bleached Nanocellulose on the Thermal and Flammability of Polypropylene-Reinforced Kenaf Core Hybrid Polymer Bionanocomposites. Polymers. 2021;13:116.

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    Saelee K., Yingkamhaeng N., Nimchua T., Sukyai P. An environmentally friendly xylanase-assisted pretreatment for cellulose nanofibrils isolation from sugarcane bagasse by high-pressure homogenization. Ind. Crops Prod. 2016;82:149-160.

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    Rebouillat S., Pla F. State of the Art Manufacturing and Engineering of Nanocellulose: A Review of Available Data and Industrial Applications. J. Biomater. Nanobiotechnol. 2013;04:165-188.

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    Siró I., Plackett D. Microfibrillated cellulose and new nanocomposite materials: A review. Cellulose. 2010;17:459-494.

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    Jonoobi M., Harun J., Tahir P.M., Zaini L.H., SaifulAzry S., Makinejad M.D. Characteristics of nanofibers extracted from kenaf core. BioResources. 2010;5:2556-2566.

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    Alemdar A., Sain M. Isolation and characterization of nanofibers from agricultural residues—Wheat straw and soy hulls. Bioresour. Technol. 2008;99:1664-1671.

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    Deshpande A.P., Bhaskar Rao M., Lakshmana Rao C. Extraction of bamboo fibers and their use as reinforcement in polymeric composites. J. Appl. Polym. Sci. 2000;76:83-92.

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    Kushwaha P.K., Kumar R. The studies on performance of epoxy and polyester-based composites reinforced with bamboo and glass fibers. J. Reinf. Plast. Compos. 2010;29:1952-1962.

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    Kushwaha P.K., Kumar R. Studies on performance of acrylonitrile-pretreated bamboo-reinforced thermosetting resin composites. J. Reinf. Plast. Compos. 2010;29:1347-1352.

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    Abral H., Ariksa J., Mahardika M., Handayani D., Aminah I., Sandrawati N., Sapuan S.M., Ilyas R.A. Highly transparent and antimicrobial PVA based bionanocomposites reinforced by ginger nanofiber. Polym. Test. 2019;81:106186.

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    Hyojin K., Kazuya O., Toru F., Kenichi T. Influence of fiber extraction and surface modification on mechanical properties of green composites with bamboo fiber. J. Adhes. Sci. Technol. 2013;27:1348-1358.

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    Zakikhani P., Zahari R., Sultan M.T.H., Majid D.L. Extraction and preparation of bamboo fibre-reinforced composites. Mater. Des. 2014;63:820-828.

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    Rao K.M.M., Rao K.M. Extraction and tensile properties of natural fibers: Vakka, date and bamboo. Compos. Struct. 2007;77:288-295.

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    Phong N.T., Fujii T., Chuong B., Okubo K. Study on How to Effectively Extract Bamboo Fibers from Raw Bamboo and Wastewater Treatment. J. Mater. Sci. Res. 2011;1:144-155.

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    Sharma A., Thakur M., Bhattacharya M., Mandal T., Goswami S. Commercial application of cellulose nano-composites—A review. Biotechnol. Rep. 2019;21:e00316.

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    Kalia S., Boufi S., Celli A., Kango S. Nanofibrillated cellulose: Surface modification and potential applications. Colloid Polym. Sci. 2014;292:5-31.

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    Ling S., Chen W., Fan Y., Zheng K., Jin K., Yu H., Buehler M.J., Kaplan D.L. Biopolymer nanofibrils: Structure, modeling, preparation, and applications. Prog. Polym. Sci. 2018;85:1-56.

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    Nishiyama Y. Structure and properties of the cellulose microfibril. J. Wood Sci. 2009;55:241-249.

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    Nanofibrillated Cellulose Surface Modification: A Review · 2013
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    Andberg M., Penttilä M., Saloheimo M. Swollenin from Trichoderma reesei exhibits hydrolytic activity against cellulosic substrates with features of both endoglucanases and cellobiohydrolases. Bioresour. Technol. 2015;181:105-113.

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    Long L., Tian D., Hu J., Wang F., Saddler J. A xylanase-aided enzymatic pretreatment facilitates cellulose nanofibrillation. Bioresour. Technol. 2017;243:898-904.

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    Henriksson M., Henriksson G., Berglund L.A., Lindström T. An environmentally friendly method for enzyme-assisted preparation of microfibrillated cellulose (MFC) nanofibers. Eur. Polym. J. 2007;43:3434-3441.

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    Fraschini C., Chauve G., Bouchard J. TEMPO-mediated surface oxidation of cellulose nanocrystals (CNCs). Cellulose. 2017;24:2775-2790.

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    Gamelas J.A.F., Pedrosa J., Lourenço A.F., Mutjé P., González I., Chinga-Carrasco G., Singh G., Ferreira P.J.T. On the morphology of cellulose nanofibrils obtained by TEMPO-mediated oxidation and mechanical treatment. Micron. 2015;72:28-33.

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    Medronho B., Andrade R., Vivod V., Ostlund A., Miguel M.G., Lindman B., Voncina B., Valente A.J.M. Cyclodextrin-grafted cellulose: Physico-chemical characterization. Carbohydr. Polym. 2013;93:324-330.

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    Aulin C., Shchukarev A., Lindqvist J., Malmström E., Wågberg L., Lindström T. Wetting kinetics of oil mixtures on fluorinated model cellulose surfaces. J. Colloid Interface Sci. 2008;317:556-567.

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    Kaboorani A., Riedl B. Surface modification of cellulose nanocrystals (CNC) by a cationic surfactant. Ind. Crops Prod. 2015;65:45-55.

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    Eyley S., Thielemans W. Surface modification of cellulose nanocrystals. Nanoscale. 2014;6:7764-7779.

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    Larsson E., Sanchez C.C., Porsch C., Karabulut E., Wågberg L., Carlmark A. Thermo-responsive nanofibrillated cellulose by polyelectrolyte adsorption. Eur. Polym. J. 2013;49:2689-2696.

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    Hokkanen S., Bhatnagar A., Sillanpää M. A review on modification methods to cellulose-based adsorbents to improve adsorption capacity. Water Res. 2016;91:156-173.

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    Kalia S., Sabaa M.W. Polysaccharide Based Graft Copolymers. 2013;Volume 9783642365.

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    Wei L., McDonald A.G., Stark N.M. Grafting of Bacterial Polyhydroxybutyrate (PHB) onto Cellulose via In Situ Reactive Extrusion with Dicumyl Peroxide. Biomacromolecules. 2015;16:1040-1049.

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    Tee Y.B., Talib R.A., Abdan K., Chin N.L., Basha R.K., Md Yunos K.F. Thermally Grafting Aminosilane onto Kenaf-Derived Cellulose and Its Influence on the Thermal Properties of Poly(Lactic Acid) Composites. BioResources. 2013;8:4468-4483.

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    Cheng D., Wen Y., Wang L., An X., Zhu X., Ni Y. Adsorption of polyethylene glycol (PEG) onto cellulose nano-crystals to improve its dispersity. Carbohydr. Polym. 2015;123:157-163.

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    Alves Fidelis M.E., Pereira T.V.C., Gomes O.D.F.M., De Andrade Silva F., Toledo Filho R.D. The effect of fiber morphology on the tensile strength of natural fibers. J. Mater. Res. Technol. 2013;2:149-157.

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    Papageorgiou D.G., Kinloch I.A., Young R.J. Mechanical properties of graphene and graphene-based nanocomposites. Prog. Mater. Sci. 2017;90:75-127.

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    Chuayjuljit S., Su-Uthai S., Charuchinda S. Poly(vinyl chloride) film filled with microcrystalline cellulose prepared from cotton fabric waste: Properties and biodegradability study. Waste Manag. Res. 2010;28:109-117.

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    Sun X., Lu C., Liu Y., Zhang W., Zhang X. Melt-processed poly(vinyl alcohol) composites filled with microcrystalline cellulose from waste cotton fabrics. Carbohydr. Polym. 2014;101:642-649.

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    Samat N., Marini C.D., Maritho M.A., Sabaruddin F.A. Tensile and impact properties of polypropylene/microcrystalline cellulose treated with different coupling agents. Compos. Interfaces. 2013;20:497-506.

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    Chen J., Long Z., Wang J., Wu M., Wang F., Wang B., Lv W. Preparation and properties of microcrystalline cellulose/hydroxypropyl starch composite films. Cellulose. 2017;24:4449-4459.

    Not in our library10.1007/s10570-017-1423-6

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    Suzuki K., Sato A., Okumura H., Hashimoto T., Nakagaito A.N., Yano H. Novel high-strength, micro fibrillated cellulose-reinforced polypropylene composites using a cationic polymer as compatibilizer. Cellulose. 2014;21:507-518.

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    Gabr M.H., Phong N.T., Abdelkareem M.A., Okubo K., Uzawa K., Kimpara I., Fujii T. Mechanical, thermal, and moisture absorption properties of nano-clay reinforced nano-cellulose biocomposites. Cellulose. 2013;20:819-826.

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    Noorbakhsh-Soltani S.M., Zerafat M.M., Sabbaghi S. A comparative study of gelatin and starch-based nano-composite films modified by nano-cellulose and chitosan for food packaging applications. Carbohydr. Polym. 2018;189:48-55.

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  113. 113.

    Ching Y.C., Rahman A., Ching K.Y., Sukiman N.L., Chuah C.H. Preparation and characterization of polyvinyl alcohol-based composite reinforced with nanocellulose and nanosilica. BioResources. 2015;10:3364-3377.

    Not in our library10.15376/biores.10.2.3364-3377

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    Chirayil C.J., Mathew L., Hassan P.A., Mozetic M., Thomas S. Rheological behaviour of nanocellulose reinforced unsaturated polyester nanocomposites. Int. J. Biol. Macromol. 2014;69:274-281.

    Not in our library10.1016/j.ijbiomac.2014.05.055

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    Dehnad D., Emam-Djomeh Z., Mirzaei H., Jafari S.M., Dadashi S. Optimization of physical and mechanical properties for chitosan- nanocellulose biocomposites. Carbohydr. Polym. 2014;105:222-228.

    Not in our library10.1016/j.carbpol.2014.01.094

  116. 116.

    Anju T.R., Ramamurthy K., Dhamodharan R. Surface modified microcrystalline cellulose from cotton as a potential mineral admixture in cement mortar composite. Cem. Concr. Compos. 2016;74:147-153.

    Not in our library10.1016/j.cemconcomp.2016.09.003

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    Parveen S., Rana S., Ferreira S., Filho A., Fangueiro R. Ultrasonic dispersion of micro crystalline cellulose for developing cementitious composites with excellent strength and stiffness. Ind. Crops Prod. 2018;122:156-165.

    Not in our library10.1016/j.indcrop.2018.05.060

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    Boran S., Dizman Tomak E., Dönmez Çavdar A. Biological properties of nutshell and microcrystalline cellulose (MCC) filled high density polyethylene composites. Arch. Mater. Sci. Eng. 2016;78:71-77.

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    Erbas Kiziltas E., Kiziltas A., Bollin S.C., Gardner D.J. Preparation and characterization of transparent PMMA-cellulose-based nanocomposites. Carbohydr. Polym. 2015;127:381-389.

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  120. 120.

    Cao Y., Zavaterri P., Youngblood J., Moon R., Weiss J. The influence of cellulose nanocrystal additions on the performance of cement paste. Cem. Concr. Compos. 2015;56:73-83.

    Not in our library10.1016/j.cemconcomp.2014.11.008

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    Fu T., Montes F., Suraneni P., Youngblood J., Weiss J. The influence of cellulose nanocrystals on the hydration and flexural strength of Portland cement pastes. Polymers. 2017;9:424.

    Not in our library10.3390/polym9090424

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    Gabr M.H., Phong N.T., Okubo K., Uzawa K., Kimpara I., Fujii T. Thermal and mechanical properties of electrospun nano-celullose reinforced epoxy nanocomposites. Polym. Test. 2014;37:51-58.

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    Cataldi A., Dorigato A., Deflorian F., Pegoretti A. Thermo-mechanical properties of innovative microcrystalline cellulose filled composites for art protection and restoration. J. Mater. Sci. 2014;49:2035-2044.

    Not in our library10.1007/s10853-013-7892-6

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    Dos Santos F.A., Tavares M.I.B. Development and characterization of hybrid materials based on biodegradable PLA matrix, microcrystalline cellulose and organophilic silica. Polimeros. 2014;24:561-566.

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    Sabo R., Jin L., Stark N., Ibach R.E. Effect of environmental conditions on the mechanical properties and fungal degradation of polycaprolactone/microcrystalline cellulose/wood flour composites. BioResources. 2013;8:3322-3335.

    Not in our library10.15376/biores.8.3.3322-3335

  126. 126.

    Lee J.A., Yoon M.J., Lee E.S., Lim D.Y., Kim K.Y. Preparation and characterization of cellulose nanofibers (CNFs) from microcrystalline cellulose (MCC) and CNF/polyamide 6 composites. Macromol. Res. 2014;22:738-745.

    Not in our library10.1007/s13233-014-2121-y

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    Arjmandi R., Hassan A., Eichhorn S.J., Mohamad Haafiz M.K., Zakaria Z., Tanjung F.A. Enhanced ductility and tensile properties of hybrid montmorillonite/cellulose nanowhiskers reinforced polylactic acid nanocomposites. J. Mater. Sci. 2015;50:3118-3130.

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  128. 128.

    Jabbar A., Militký J., Wiener J., Kale B.M., Ali U., Rwawiire S. Nanocellulose coated woven jute/green epoxy composites: Characterization of mechanical and dynamic mechanical behavior. Compos. Struct. 2017;161:340-349.

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    Kiziltas A., Gardner D.J., Han Y., Yang H.S. Mechanical Properties of Microcrystalline Cellulose (MCC) Filled Engineering Thermoplastic Composites. J. Polym. Environ. 2014;22:365-372.

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    Parveen S., Rana S., Fangueiro R., Paiva M.C. A novel approach of developing micro crystalline cellulose reinforced cementitious composites with enhanced microstructure and mechanical performance. Cem. Concr. Compos. 2017;78:146-161.

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    Dai X., Xiong Z., Ma S., Li C., Wang J., Na H., Zhu J. Fabricating highly reactive bio-based compatibilizers of epoxidized citric acid to improve the flexural properties of polylactide/microcrystalline cellulose blends. Ind. Eng. Chem. Res. 2015;54:3806-3812.

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    Saba N., Mohammad F., Pervaiz M., Jawaid M., Alothman O.Y., Sain M. Mechanical, morphological and structural properties of cellulose nanofibers reinforced epoxy composites. Int. J. Biol. Macromol. 2017;97:190-200.

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    Zhang Y., Wu J., Wang B., Sui X., Zhong Y., Zhang L., Mao Z., Xu H. Cellulose nanofibril-reinforced biodegradable polymer composites obtained via a Pickering emulsion approach. Cellulose. 2017;24:3313-3322.

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    Chaiwutthinan P., Pimpan V., Chuayjuljit S., Leejarkpai T. Biodegradable Plastics Prepared from Poly(lactic acid), Poly(butylene succinate) and Microcrystalline Cellulose Extracted from Waste-Cotton Fabric with a Chain Extender. J. Polym. Environ. 2015;23:114-125.

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    Soheilmoghaddam M., Wahit M.U., Ibrahim Akos N. Regenerated cellulose/epoxidized natural rubber blend film. Mater. Lett. 2013;111:221-224.

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    El-Hadi A.M. Increase the elongation at break of poly (lactic acid) composites for use in food packaging films. Sci. Rep. 2017;7:46767.

    Not in our library10.1038/srep46767

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    Niazi M.B.K., Jahan Z., Berg S.S., Gregersen Ø.W. Mechanical, thermal and swelling properties of phosphorylated nanocellulose fibrils/PVA nanocomposite membranes. Carbohydr. Polym. 2017;177:258-268.

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    Gu J., Chen W.J., Lin L., Luo Y.F., Jia D.M. Effect of nanocrystalline cellulose on the curing characteristics and aging resistance properties of carbon black reinforced natural rubber. Chin. J. Polym. Sci. Engl. Ed. 2013;31:1382-1393.

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  139. 139.

    Dai L., Wang L.Y., Yuan T.Q., He J. Study on thermal degradation kinetics of cellulose-graft-poly(l-lactic acid) by thermogravimetric analysis. Polym. Degrad. Stab. 2014;99:233-239.

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    Fiore V., Scalici T., Badagliacco D., Enea D., Alaimo G., Valenza A. Aging resistance of bio-epoxy jute-basalt hybrid composites as novel multilayer structures for cladding. Compos. Struct. 2017;160:1319-1328.

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    Movilla-Quesada D., Raposeiras A.C., Muñoz O., Castro-Fresno D. Reduction in the use of mineral aggregate by recycling cellulose ashes to decrease the aging of hot asphalt mixtures. Constr. Build. Mater. 2017;143:547-557.

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    Abdullah M.E., Rosni N.N.M., Jaya R.P., Yaacob H., Hassan N.A. Agussabti Effect of charcoal ash coconut shell from waste material at different size on the physical properties of bitumen. Key Eng. Mater. 2017;744:121-125.

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    Bhasney S.M., Bhagabati P., Kumar A., Katiyar V. Morphology and crystalline characteristics of polylactic acid [PLA]/linear low density polyethylene [LLDPE]/microcrystalline cellulose [MCC] fiber composite. Compos. Sci. Technol. 2019;171:54-61.

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    Zhuravleva N., Reznik A., Kiesewetter D., Stolpner A., Khripunov A. Possible applications of bacterial cellulose in the manufacture of electrical insulating paper. J. Phys. Conf. Ser. 2018;1124:031008.

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    Liu Y., Zhang S., Wang X., Pan Y., Zhang F., Huang J. Mechanical and aging resistance properties of polypropylene (PP) reinforced with nanocellulose/attapulgite composites (NCC/AT). Compos. Interfaces. 2020;27:73-85.

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    Morán J.I., Vázquez A., Cyras V.P. Bio-nanocomposites based on derivatized potato starch and cellulose, preparation and characterization. J. Mater. Sci. 2013;48:7196-7203.

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    Yang B., Zhang M., Lu Z., Tan J., Luo J.J., Song S., Ding X., Wang L., Lu P., Zhang Q. Comparative study of aramid nanofiber (ANF) and cellulose nanofiber (CNF). Carbohydr. Polym. 2019;208:372-381.

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    Balakrishnan P., Gopi S., Sreekala M.S., Thomas S. UV resistant transparent bionanocomposite films based on potato starch/cellulose for sustainable packaging. Starch-Stärke. 2018;70:1700139.

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    Li Z., Liu J., Jiang K., Thundat T. Carbonized nanocellulose sustainably boosts the performance of activated carbon in ionic liquid supercapacitors. Nano Energy. 2016;25:161-169.

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    Le Bras D., Strømme M., Mihranyan A. Characterization of dielectric properties of nanocellulose from wood and algae for electrical insulator applications. J. Phys. Chem. B. 2015;119:5911-5917.

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    Willgert M., Boujemaoui A., Malmström E., Constable E.C., Housecroft C.E. Copper-based dye-sensitized solar cells with quasi-solid nano cellulose composite electrolytes. RSC Adv. 2016;6:56571-56579.

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    Zhao Y., Dang W., Lu Z., Deng J., Hao Y., Su Z., Zhang M. Fabrication of mechanically robust and UV-resistant aramid fiber-based composite paper by adding nano-TiO2 and nanofibrillated cellulose. Cellulose. 2018;25:3913-3925.

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    Jang Y.W., Min B.G., Yoon K.H. Enhancement in compressive strength and UV ageing-resistance of poly(p-phenylene benzobisoxazole) nanocomposite fiber containing modified polyhedral oligomeric silsesquioxane. Fibers Polym. 2017;18:575-581.

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    Chen L., Hu Z., Wu Z., Wu G., Ma L., Zhang C., Huang Y. POSS-bound ZnO nanowires as interphase for enhancing interfacial strength and hydrothermal aging resistance of PBO fiber/epoxy resin composites. Compos. Part A Appl. Sci. Manuf. 2017;96:1-8.

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    Feng Y., Zhang J., He J., Zhang J. Transparent cellulose/polyhedral oligomeric silsesquioxane nanocomposites with enhanced UV-shielding properties. Carbohydr. Polym. 2016;147:171-177.

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    De Amorim J.D.P., de Souza K.C., Duarte C.R., da Silva Duarte I., de Assis Sales Ribeiro F., Silva G.S., de Farias P.M.A., Stingl A., Costa A.F.S., Vinhas G.M., et al. Plant and bacterial nanocellulose: Production, properties and applications in medicine, food, cosmetics, electronics and engineering. A review. Environ. Chem. Lett. 2020;18:851-869.

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    Pacheco G., de Mello C.V., Chiari-Andréo B.G., Isaac V.L.B., Ribeiro S.J.L., Pecoraro É., Trovatti E. Bacterial cellulose skin masks—Properties and sensory tests. J. Cosmet. Dermatol. 2018;17:840-847.

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    Reiniati I., Hrymak A.N., Margaritis A. Recent developments in the production and applications of bacterial cellulose fibers and nanocrystals. Crit. Rev. Biotechnol. 2017;37:510-524.

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    Wei H., Rodriguez K., Renneckar S., Vikesland P.J. Environmental science and engineering applications of nanocellulose-based nanocomposites. Environ. Sci. Nano. 2014;1:302-316.

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    De Oliveira Barud H.G., da Silva R.R., da Silva Barud H., Tercjak A., Gutierrez J., Lustri W.R., de Oliveira O.B., Ribeiro S.J.L. A multipurpose natural and renewable polymer in medical applications: Bacterial cellulose. Carbohydr. Polym. 2016;153:406-420.

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    Azeredo H.M.C., Rosa M.F., Mattoso L.H.C. Nanocellulose in bio-based food packaging applications. Ind. Crops Prod. 2017;97:664-671.

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    Gama M., Dourado F., Bielecki S. Bacterial NanoCellulose: From Biotechnology to Bio-Economy. 2016.

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    Boufi S., González I., Delgado-Aguilar M., Tarrès Q., Pèlach M.À., Mutjé P. Nanofibrillated cellulose as an additive in papermaking process: A review. Carbohydr. Polym. 2016;154:151-166.

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    Grüneberger F., Künniger T., Zimmermann T., Arnold M. Rheology of nanofibrillated cellulose/acrylate systems for coating applications. Cellulose. 2014;21:1313-1326.

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    Naderi A., Lindström T., Sundström J. Carboxymethylated nanofibrillated cellulose: Rheological studies. Cellulose. 2014;21:1561-1571.

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    Missoum K., Martoïa F., Belgacem M.N., Bras J. Effect of chemically modified nanofibrillated cellulose addition on the properties of fiber-based materials. Ind. Crops Prod. 2013;48:98-105.

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    Gupta P., Singh B., Agrawal A.K., Maji P.K. Low density and high strength nanofibrillated cellulose aerogel for thermal insulation application. Mater. Des. 2018;158:224-236.

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    Wang X., Cheng F., Liu J., Smått J.H., Gepperth D., Lastusaari M., Xu C., Hupa L. Biocomposites of copper-containing mesoporous bioactive glass and nanofibrillated cellulose: Biocompatibility and angiogenic promotion in chronic wound healing application. Acta Biomater. 2016;46:286-298.

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    Brown E.E., Hu D., Abu Lail N., Zhang X. Potential of nanocrystalline cellulose-fibrin nanocomposites for artificial vascular graft applications. Biomacromolecules. 2013;14:1063-1071.

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    George J., Sabapathi S.N. Cellulose nanocrystals: Synthesis, functional properties, and applications. Nanotechnol. Sci. Appl. 2015;8:45-54.

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    Yang S., Tang Y., Wang J., Kong F., Zhang J. Surface Treatment of Cellulosic Paper with Starch-Based Composites Reinforced with Nanocrystalline Cellulose. Ind. Eng. Chem. Res. 2014;53:13980-13988.

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    Jawaid M., Boufi S., Abdul Khalil H.P.S. Cellulose-Reinforced Nanofibre Composites: Production, Properties and Applications. 2017.

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    Lalia B.S., Samad Y.A., Hashaikeh R. Nanocrystalline cellulose-reinforced composite mats for lithium-ion batteries: Electrochemical and thermomechanical performance. J. Solid State Electrochem. 2013;17:575-581.

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    Ilyas R.A., Sapuan M.S., Norizan M.N., Norrrahim M.N.F., Ibrahim R., Atikah M.S.N., Huzaifah M.R.M., Radzi A.M., Izwan S., Azammi A.M.N., Sapuan M.S., Ilyas R.A., et al. Macro to nanoscale natural fiber composites for automotive components: Research, development, and application. Biocomposite and Synthetic Composites for Automotive Applications. 2020.

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    Ilyas R.A., Sapuan S.M., Asyraf M.R.M., Atikah M.S.N., Ibrahim R., Dele-Afolabia T.T., Sapuan S.M., Jumaidin R., Hanafi I. Introduction to biofiller reinforced degradable polymer composites. Biofiller Reinforced Biodegradable Polymer Composites. 2020.

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    Lynch M. Decorative Skin and Hair Cosmetics Containing Microcrystalline Cellulose As Enhancing Agent. U.S. Patent. 2004.

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    Norrrahim M.N.F., Norizan M.N., Ilyas R.A., Sapuan M.S., Jenol M.A., Sapuan M.S., Ilyas R.A. Performance Evaluation of Cellulose Nanofiber Reinforced Polypropylene Biocomposites for Automotive Applications. Biocomposite and Synthetic Composites for Automotive Applications. 2020.

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    Miao C., Hamad W.Y. In-situ polymerized cellulose nanocrystals (CNC)—poly(L-lactide) (PLLA) nanomaterials and applications in nanocomposite processing. Carbohydr. Polym. 2016;153:549-558.

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    Dufresne A. Cellulose nanomaterial reinforced polymer nanocomposites. Curr. Opin. Colloid Interface Sci. 2017;29:1-8.

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    Kuboki T. Mechanical properties and foaming behavior of injection molded cellulose fiber reinforced polypropylene composite foams. J. Cell. Plast. 2014;50:129-143.

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    Zhang W., He X., Li C., Zhang X., Lu C., Zhang X., Deng Y. High performance poly (vinyl alcohol)/cellulose nanocrystals nanocomposites manufactured by injection molding. Cellulose. 2014;21:485-494.

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    Shokrieh M.M. Residual Stresses in Composite Materials. 2014.

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    Heim H.P., Tromm M. General aspects of foam injection molding using local precision mold opening technology. Polymer. 2015;56:111-118.

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    Wang L., Okada K., Hikima Y., Ohshima M., Sekiguchi T., Yano H. Effect of cellulose nanofiber (CNF) surface treatment on cellular structures and mechanical properties of polypropylene/CNF nanocomposite foams via core-back foam injection molding. Polymers. 2019;11:249.

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    Peng J., Walsh P.J., Sabo R.C., Turng L.S., Clemons C.M. Water-assisted compounding of cellulose nanocrystals into polyamide 6 for use as a nucleating agent for microcellular foaming. Polymer. 2016;84:158-166.

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    Borkotoky S.S., Dhar P., Katiyar V. Biodegradable poly (lactic acid)/Cellulose nanocrystals (CNCs) composite microcellular foam: Effect of nanofillers on foam cellular morphology, thermal and wettability behavior. Int. J. Biol. Macromol. 2018;106:433-446.

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    Wang L., Ishihara S., Hikima Y., Ohshima M., Sekiguchi T., Sato A., Yano H. Unprecedented Development of Ultrahigh Expansion Injection-Molded Polypropylene Foams by Introducing Hydrophobic-Modified Cellulose Nanofibers. ACS Appl. Mater. Interfaces. 2017;9:9250-9254.

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    Standau T. Batch Foaming and Foam Extrusion. University of Bayreuth. 2010;1.

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    Kuboki T., Park C.B. Chapter 13 Foaming Technology of Wood Fiber/Plastic Composites. Mater. Energy. 2014;197-218.

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    Li Q., Matuana L.M. Foam Extrusion of High Density Polyethylene/Wood-Flour Composites Using Chemical Foaming Agents. J. Appl. Polym. Sci. 2003;88:3139-3150.

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    Yang Z., Peng H., Wang W., Liu T. Crystallization behavior of poly(ε-caprolactone)/layered double hydroxide nanocomposites. J. Appl. Polym. Sci. 2010;116:2658-2667.

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    Romeo RIM. What Is Structural Foam Molding? Romeorim Reaction Injection Molding. 2020;1.

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    Bledzki A.K., Faruk O. Influence of processing temperature on microcellular injection-moulded wood-polypropylene composites. Macromol. Mater. Eng. 2006;291:1226-1232.

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    Yoon J.D., Kuboki T., Jung P.U., Wang J., Park C.B. Injection molding of wood-fiber/plastic composite foams. Compos. Interfaces. 2009;16:797-811.

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    Ilyas R.A., Sapuan S.M. Biopolymers and Biocomposites: Chemistry and Technology. Curr. Anal. Chem. 2020;16:500-503.

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    Zhu L., Zong L., Wu X., Li M., Wang H., You J., Li C. Shapeable Fibrous Aerogels of Metal–Organic-Frameworks Templated with Nanocellulose for Rapid and Large-Capacity Adsorption. ACS Nano. 2018;12:4462-4468.

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    Roohani M., Habibi Y., Belgacem N.M., Ebrahim G., Karimi A.N., Dufresne A. Cellulose whiskers reinforced polyvinyl alcohol copolymers nanocomposites. Eur. Polym. J. 2008;44:2489-2498.

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    Cao X., Xu C., Wang Y., Liu Y., Liu Y., Chen Y. New nanocomposite materials reinforced with cellulose nanocrystals in nitrile rubber. Polym. Test. 2013;32:819-826.

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    Mahendra I.P., Wirjosentono B., Tamrin T., Ismail H., Mendez J.A., Causin V. The effect of nanocrystalline cellulose and TEMPO-oxidized nanocellulose on the compatibility of polypropylene/cyclic natural rubber blends. J. Thermoplast. Compos. Mater. 2020.

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    Dai H., Zhang H., Ma L., Zhou H., Yu Y., Guo T., Zhang Y., Huang H. Green pH/magnetic sensitive hydrogels based on pineapple peel cellulose and polyvinyl alcohol: Synthesis, characterization and naringin prolonged release. Carbohydr. Polym. 2019;209:51-61.

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    Jain M., Pradhan M.K. Morphology and mechanical properties of sisal fiber and nano cellulose green rubber composite: A comparative study. Int. J. Plast. Technol. 2016;20:378-400.

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    Karmaker N., Islam F., Islam M.N., Razzak M., Koly F.A., Chowdhury A.M.S., Khan R.A. Fabrication and Characterization of PVA-Gelatin-Nano Crystalline Cellulose based Biodegradable Film: Effect of Gamma Radiation. J. Res. Updates Polym. Sci. 2019;8:7-14.

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    Xu S., Girouard N., Schueneman G., Shofner M.L., Meredith J.C. Mechanical and thermal properties of waterborne epoxy composites containing cellulose nanocrystals. Polymer. 2013;54:6589-6598.

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    Zhang K., Lu Y., Hao N., Nie S. Enhanced thermal conductivity of cellulose nanofibril/aluminum nitride hybrid films by surface modification of aluminum nitride. Cellulose. 2019;26:8669-8683.

    Not in our library10.1007/s10570-019-02694-5

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    Pandurangan M.T., Kanny K. Study of curing characteristics of cellulose nanofiber-filled epoxy nanocomposites. Catalysts. 2020;10:831.

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    Khan A., Asiri A.M., Jawaid M., Saba N. Inamuddin Effect of cellulose nano fibers and nano clays on the mechanical, morphological, thermal and dynamic mechanical performance of kenaf/epoxy composites. Carbohydr. Polym. 2020;239:116248.

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    Nair S.S., Kuo P.-Y., Chen H., Yan N. Investigating the effect of lignin on the mechanical, thermal, and barrier properties of cellulose nanofibril reinforced epoxy composite. Ind. Crops Prod. 2017;100:208-217.

    Not in our library10.1016/j.indcrop.2017.02.032

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    Vu C.M., Sinh L.H., Choi H.J., Pham T.D. Effect of micro/nano white bamboo fibrils on physical characteristics of epoxy resin reinforced composites. Cellulose. 2017;24:5475-5486.

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    Guimarães Junior M., Teixeira F.G., Tonoli G.H.D. Effect of the nano-fibrillation of bamboo pulp on the thermal, structural, mechanical and physical properties of nanocomposites based on starch/poly(vinyl alcohol) blend. Cellulose. 2018.

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    Ilyas R.A., Sapuan S.M. The Preparation Methods and Processing of Natural Fibre Bio-polymer Composites. Curr. Org. Synth. 2020;16:1068-1070.

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    Nazrin A., Sapuan S.M., Zuhri M.Y.M., Ilyas R.A., Syafiq R., Sherwani S.F.K. Nanocellulose Reinforced Thermoplastic Starch (TPS), Polylactic Acid (PLA), and Polybutylene Succinate (PBS) for Food Packaging Applications. Front. Chem. 2020;8:213.

    Not in our library10.3389/fchem.2020.00213

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    Takkalkar P., Griffin G., Kao N. Enhanced Mechanical and Barrier Performance of Poly (Lactic Acid) Based Nanocomposites Using Surface Acetylated Starch Nanocrystals. J. Polym. Environ. 2019;27:2078-2088.

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    Blaker J.J., Lee K.-Y., Walters M., Drouet M., Bismarck A. Aligned unidirectional PLA/bacterial cellulose nanocomposite fibre reinforced PDLLA composites. React. Funct. Polym. 2014;85:185-192.

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    Dhar P., Tarafder D., Kumar A., Katiyar V. Thermally recyclable polylactic acid/cellulose nanocrystal films through reactive extrusion process. Polymer. 2016;87:268-282.

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    Sung S.H., Chang Y., Han J. Development of polylactic acid nanocomposite films reinforced with cellulose nanocrystals derived from coffee silverskin. Carbohydr. Polym. 2017;169:495-503.

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    Kale R.D., Gorade V.G., Madye N., Chaudhary B., Bangde P.S., Dandekar P.P. Preparation and characterization of biocomposite packaging film from poly(lactic acid) and acylated microcrystalline cellulose using rice bran oil. Int. J. Biol. Macromol. 2018;118:1090-1102.

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    Zhang P., Gao D., Zou P., Wang B. Preparation and thermomechanical properties of nanocrystalline cellulose reinforced poly(lactic acid) nanocomposites. J. Appl. Polym. Sci. 2017;134.

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    Rahmat M., Karrabi M., Ghasemi I., Zandi M., Azizi H. Silane crosslinking of electrospun poly (lactic acid)/nanocrystalline cellulose bionanocomposite. Mater. Sci. Eng. C. 2016;68:397-405.

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    Mukherjee T., Tobin M.J., Puskar L., Sani M.-A., Kao N., Gupta R.K., Pannirselvam M., Quazi N., Bhattacharya S. Chemically imaging the interaction of acetylated nanocrystalline cellulose (NCC) with a polylactic acid (PLA) polymer matrix. Cellulose. 2017;24:1717-1729.

    Not in our library10.1007/s10570-017-1217-x

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    Mármol G., Gauss C., Fangueiro R. Potential of Cellulose Microfibers for PHA and PLA Biopolymers Reinforcement. Molecules. 2020;25:4653.

    Not in our library10.3390/molecules25204653

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    Hazwan Hussin M. Physicochemical Studies of Kenaf Nanocrystaline Cellulose and Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate) as Filler for Lithium Perchlorate based Polymer Electrolyte. Int. J. Electrochem. Sci. 2019;14:1620-1633.

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    Zhang B., Huang C., Zhao H., Wang J., Yin C., Zhang L., Zhao Y. Eects of cellulose nanocrystals and cellulose nanofibers on the structure and properties of polyhydroxybutyrate nanocomposites. Polymers. 2019;11:2063.

    Not in our library10.3390/polym11122063

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    Zheng T., Zhang Z., Shukla S., Agnihotri S., Clemons C.M., Pilla S. PHBV-graft-GMA via reactive extrusion and its use in PHBV/nanocellulose crystal composites. Carbohydr. Polym. 2019;205:27-34.

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    Xu J., Manepalli P.H., Zhu L., Narayan-Sarathy S., Alavi S. Morphological, barrier and mechanical properties of films from poly (butylene succinate) reinforced with nanocrystalline cellulose and chitin whiskers using melt extrusion. J. Polym. Res. 2019;26:188.

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    Zhang X., Zhang Y. Reinforcement effect of poly(butylene succinate) (PBS)-grafted cellulose nanocrystal on toughened PBS/polylactic acid blends. Carbohydr. Polym. 2016;140:374-382.

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    Vaezi K., Asadpour G., Sharifi S.H. Effect of coating with novel bio nanocomposites of cationic starch/cellulose nanocrystals on the fundamental properties of the packaging paper. Polym. Test. 2019;80:106080.

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    Jiang B., Li S., Wu Y., Song J., Chen S., Li X., Sun H. Preparation and characterization of natural corn starch-based composite films reinforced by eggshell powder. CYTA J. Food. 2018;16:1045-1054.

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    Al Fath M.T., Nasution H., Harahap H., Ayu G.E. Biocomposite of pectin and starch filled with nanocrystalline cellulose (NCC): The effect of filler loading and glycerol addition. AIP Conf. Proc. 2019;2175:020012.

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    Nasution H., Harahap H., Al Fath M.T., Afandy Y. Physical properties of sago starch biocomposite filled with Nanocrystalline Cellulose (NCC) from rattan biomass: The effect of filler loading and co-plasticizer addition. IOP Conf. Ser. Mater. Sci. Eng. 2018;309:012033.

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    Syafri E., Sudirman, Mashadi, Yulianti E., Deswita, Asrofi M., Abral H., Sapuan S.M., Ilyas R.A., Fudholi A. Effect of sonication time on the thermal stability, moisture absorption, and biodegradation of water hyacinth (Eichhornia crassipes) nanocellulose-filled bengkuang (Pachyrhizus erosus) starch biocomposites. J. Mater. Res. Technol. 2019;8:6223-6231.

    Not in our library10.1016/j.jmrt.2019.10.016

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    Ilyas R.A., Sapuan S.M., Ishak M.R., Zainudin E.S. Sugar palm nanocrystalline cellulose reinforced sugar palm starch composite: Degradation and water-barrier properties. IOP Conf. Ser. Mater. Sci. Eng. 2018;368:012006.

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    Ilyas R.A., Sapuan S.M., Ishak M.R., Zainudin E.S. Development and characterization of sugar palm nanocrystalline cellulose reinforced sugar palm starch bionanocomposites. Carbohydr. Polym. 2018;202:186-202.

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    Zainuddin S.Y.Z., Ahmad I., Kargarzadeh H. Cassava starch biocomposites reinforced with cellulose nanocrystals from kenaf fibers. Compos. Interfaces. 2013;20:189-199.

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    Barkoula N.M., Alcock B., Cabrera N.O., Peijs T. Flame-Retardancy Properties of Intumescent Ammonium Poly(Phosphate) and Mineral Filler Magnesium Hydroxide in Combination with Graphene. Polym. Polym. Compos. 2008;16:101-113.

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    Zarina S., Ahmad I. Biodegradable composite films based on κ-carrageenan reinforced by cellulose nanocrystal from kenaf fibers. BioResources. 2015;10:256-271.

    Not in our library10.15376/biores.10.1.256-271

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    Slavutsky A.M., Bertuzzi M.A. Water barrier properties of starch films reinforced with cellulose nanocrystals obtained from sugarcane bagasse. Carbohydr. Polym. 2014;110:53-61.

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    Chen D., Lawton D., Thompson M.R., Liu Q. Biocomposites reinforced with cellulose nanocrystals derived from potato peel waste. Carbohydr. Polym. 2012;90:709-716.

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    Asrofi M., Sujito, Syafri E., Sapuan S.M., Ilyas R.A. Improvement of Biocomposite Properties Based Tapioca Starch and Sugarcane Bagasse Cellulose Nanofibers. Key Eng. Mater. 2020;849:96-101.

    Not in our library10.4028/www.scientific.net/kem.849.96

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    Ahsan Q., Carron T.S.S., Mustafa Z. On the use of nano fibrillated kenaf cellulose fiber as reinforcement in polylactic acid biocomposites. J. Mech. Eng. Sci. 2019;13:4970-4988.

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    Farid T., Herrera V.N., Kristiina O. Investigation of crystalline structure of plasticized poly (lactic acid)/Banana nanofibers composites. IOP Conf. Ser. Mater. Sci. Eng. 2018;369:012031.

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    Hervy M., Blaker J.J., Braz A.L., Lee K.-Y. Mechanical response of multi-layer bacterial cellulose nanopaper reinforced polylactide laminated composites. Compos. Part A Appl. Sci. Manuf. 2018;107:155-163.

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    Ghasemi S., Behrooz R., Ghasemi I., Yassar R.S., Long F. Development of nanocellulose-reinforced PLA nanocomposite by using maleated PLA (PLA-g-MA). J. Thermoplast. Compos. Mater. 2018;31:1090-1101.

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    Jonoobi M., Harun J., Mathew A.P., Oksman K. Mechanical properties of cellulose nanofiber (CNF) reinforced polylactic acid (PLA) prepared by twin screw extrusion. Compos. Sci. Technol. 2010;70:1742-1747.

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    Cherpinski A., Torres-Giner S., Vartiainen J., Peresin M.S., Lahtinen P., Lagaron J.M. Improving the water resistance of nanocellulose-based films with polyhydroxyalkanoates processed by the electrospinning coating technique. Cellulose. 2018;25:1291-1307.

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    Widiyanti P., Amali M.A. Aminatun Poly(ethylene glycol)dimethacrylate—Nanofibrillated cellulose bionanocomposites as injectable hydrogel for therapy of herniated nucleus pulposus patients. J. Mater. Res. Technol. 2020;9:12716-12722.

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    Srithep Y., Ellingham T., Peng J., Sabo R., Clemons C., Turng L.S., Pilla S. Melt compounding of poly (3-hydroxybutyrate-co-3-hydroxyvalerate)/nanofibrillated cellulose nanocomposites. Polym. Degrad. Stab. 2013;98:1439-1449.

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    Yeng L.C. Characterization and Properties of Sodium Hydroxide/Urea Regenerated Cellulose Reinforced Poly(3 Hydroxybutyrate) Biocomposites. 2016.

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    Wang Y., Uetani K., Liu S., Zhang X., Wang Y., Lu P., Wei T., Fan Z., Shen J., Yu H., et al. Multifunctional Bionanocomposite Foams with a Chitosan Matrix Reinforced by Nanofibrillated Cellulose. ChemNanoMat. 2017;3:98-108.

    Not in our library10.1002/cnma.201600266

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    Doench I., Tran T., David L., Montembault A., Viguier E., Gorzelanny C., Sudre G., Cachon T., Louback-Mohamed M., Horbelt N., et al. Cellulose Nanofiber-Reinforced Chitosan Hydrogel Composites for Intervertebral Disc Tissue Repair. Biomimetics. 2019;4:19.

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    Lomelí Ramírez M.G., Satyanarayana K.G., Iwakiri S., De Muniz G.B., Tanobe V., Flores-Sahagun T.S. Study of the properties of biocomposites. Part I. Cassava starch-green coir fibers from Brazil. Carbohydr. Polym. 2011;86:1712-1722.

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    Pitiphatharaworachot S., Chitbanyong K., Sungkaew S., Pisutpiched S., Khantayanuwong S., Puangsin B. Starch nanocomposites reinforced with TEMPO-oxidized cellulose nanofibrils derived from bamboo holocellulose. BioResources. 2019;14:2784-2797.

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    Huang L., Zhao H., Yi T., Qi M., Xu H., Mo Q., Huang C., Wang S., Liu Y. Reparation and properties of cassava residue cellulose nanofibril/cassava starch composite films. Nanomaterials. 2020;10:755.

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    De Almeida V.S., Barretti B.R.V., Ito V.C., Malucelli L., da Silva Carvalho Filho M.A., Demiate I.M., Pinheiro L.A., Lacerda L.G. Thermal, Morphological, and Mechanical Properties of Regular and Waxy Maize Starch Films Reinforced with Cellulose Nanofibers (CNF). Mater. Res. 2020;23.

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    Balakrishnan P., Sreekala M.S., Kunaver M., Huskić M., Thomas S. Morphology, transport characteristics and viscoelastic polymer chain confinement in nanocomposites based on thermoplastic potato starch and cellulose nanofibers from pineapple leaf. Carbohydr. Polym. 2017;169:176-188.

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    Tajik M., Torshizi H.J., Resalati H., Hamzeh Y. Effects of cationic starch in the presence of cellulose nanofibrils on structural, optical and strength properties of paper from soda bagasse pulp. Carbohydr. Polym. 2018;194:1-8.

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    Soni R., Asoh T.A., Uyama H. Cellulose nanofiber reinforced starch membrane with high mechanical strength and durability in water. Carbohydr. Polym. 2020;238:116203.

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    Babaee M., Jonoobi M., Hamzeh Y., Ashori A. Biodegradability and mechanical properties of reinforced starch nanocomposites using cellulose nanofibers. Carbohydr. Polym. 2015;132:1-8.

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    Karimi S., Tahir P., Dufresne A., Karimi A., Abdulkhani A. A comparative study on characteristics of nanocellulose reinforced thermoplastic starch biofilms prepared with different techniques. Nord. Pulp Pap. Res. J. 2014;29:41-45.

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    Llanos J.H.R., Tadini C.C. Preparation and characterization of bio-nanocomposite films based on cassava starch or chitosan, reinforced with montmorillonite or bamboo nanofibers. Int. J. Biol. Macromol. 2018;107:371-382.

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    Nasri-Nasrabadi B., Behzad T., Bagheri R. Preparation and characterization of cellulose nanofiber reinforced thermoplastic starch composites. Fibers Polym. 2014;15:347-354.

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    Ilyas R.A., Sapuan S.M., Ishak M.R., Zainudin E.S. Water transport properties of bio-nanocomposites reinforced by sugar palm (arenga pinnata) nanofibrillated cellulose. J. Adv. Res. Fluid Mech. Therm. Sci. 2018;51:234-246.

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    Effect of sugar palm nanofibrillated cellulose concentrations on morphological, mechanical and physical properties of biodegradable films based on agro-waste sugar palm (Arenga pinnata (Wurmb.) Merr) starch · 2019
    Not checked
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    Atikah M.S.N., Ilyas R.A., Sapuan S.M., Ishak M.R., Zainudin E.S., Ibrahim R., Atiqah A., Ansari M.N.M., Jumaidin R. Degradation and physical properties of sugar palm starch/sugar palm nanofibrillated cellulose bionanocomposite. Polimery. 2019;64:27-36.

    Not in our library10.14314/polimery.2019.10.5

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    Rozilah A., Jaafar C.N.A., Sapuan S.M., Zainol I., Ilyas R.A. The Effects of Silver Nanoparticles Compositions on the Mechanical, Physiochemical, Antibacterial, and Morphology Properties of Sugar Palm Starch Biocomposites for Antibacterial Coating. Polymers. 2020;12:2605.

    Not in our library10.3390/polym12112605

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