Effects of MXene on Nonisothermal Crystallization Kinetics of Isotactic Polypropylene

High Resolution Image Download MS PowerPoint Slide MXenes, a family of two-dimensional transition-metal carbides/nitrides, have attracted great attention and shown promising application in polymer composites. In this study, a typical MXene Ti 3 C 2 T x was prepared by selective etching. The structure and morphology of Ti 3 C 2 T x were studied by X-ray diffraction (XRD), scanning electron microscopy, and transmission electron microscopy, and the results proved that Ti 3 C 2 T x was successively fabricated. Then, Ti 3 C 2 T x /isotactic polypropylene composites with different Ti 3 C 2 T x dosages were fabricated, and the nonisothermal crystallization kinetics and melting behavior of the composites were investigated. The results indicated that when a small amount of Ti 3 C 2 T x was added, the crystallization parameters including the crystallization peak temperature and the crystallization rate increased, suggesting that crystallization was promoted. When the weight percentage of Ti 3 C 2 T x exceeded 1%, the crystallization parameters showed a reverse trend, suggesting that crystallization was hindered. The activation energy of composites with 0, 0.25, 0.5, and 1 wt % Ti 3 C 2 T x were calculated to be −164.5, −196.5, −193.8, and −147.95 kJ/mol, respectively, revealing that the crystallization of composites is concentration-dependent. The impact of Ti 3 C 2 T x dosage on the crystalline structure of the composites was studied using XRD. The related mechanism was proposed.

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