Kinetics of Crystallization and Thermal Degradation of an Isotactic Polypropylene Matrix Reinforced with Graphene/Glass-Fiber Filler

Molecules

GeorgeZ. Papageorgiou¹  DimitriosN. Bikiaris²  Evangelia Tarani³  Konstantinos Chrissafis³ 

[1] Chemistry Department, University of Ioannina, P.O. Box 1186, 45110 Ioannina, Greece;Laboratory of Polymer Chemistry and Technology, Department of Chemistry, Aristotle University of Thessaloniki, GR541 24 Thessaloniki, Greece;X-ray, Optical Characterization and Thermal Analysis Laboratory, Physics Department, Aristotle University of Thessaloniki, GR541 24 Thessaloniki, Greece;

关键词: polypropylene;    graphene nanoplatelets;    glass fibers;    crystallization;    kinetics;    activation energy;   

DOI  :  10.3390/molecules24101984

来源: DOAJ

【 摘 要 】

Polypropylene composites reinforced with a filler mixture of graphene nanoplatelet-glass fiber were prepared by melt mixing, while conventional composites containing graphene nanoplatelet and glass fiber were prepared for comparative reasons. An extensive study of thermally stimulated processes such as crystallization, nucleation, and kinetics was carried out using Differential Scanning Calorimetry and Thermogravimetric Analysis. Moreover, effective activation energy and kinetic parameters of the thermal decomposition process were determined by applying Friedman’s isoconversional differential method and multivariate non-linear regression method. It was found that the graphene nanoplatelets act positively towards the increase in crystallization rate and nucleation phenomena under isothermal conditions due to their large surface area, inherent nucleation activity, and high filler content. Concerning the thermal degradation kinetics of polypropylene graphene nanoplatelets/glass fibers composites, a change in the decomposition mechanism of the matrix was found due to the presence of graphene nanoplatelets. The effect of graphene nanoplatelets dominates that of the glass fibers, leading to an overall improvement in performance.

【 授权许可】

Unknown