Non-Isothermal Crystallization Kinetics of Poly(ethylene terephalate) /BaSO4 Composites

摘要

Three kinds of poly (ethylene terephthalate) (PET)/BaSO4 composites were prepared by melt blending of PET and different surface characteristic BaSO4 of unmodified, organically modified with silane coupling agent, and inorganically coated with SiO2/Al2O3 compound. The crystallization behaviour of the composites and pure PET were studied using differential scanning calorimetry (DSC). The cooling scanning curves showed that the crystallization peak became narrow and melting crystallization temperature (Tmc) shifted largely to high temperature region after the addition of BaSO4. However, the melting temperatures(Tm) of pure PET and PET/BaSO4 composites were not obviously changed, which indicated from the second heating scanning curves. In this research, the Jeziorny method was also employed to describe the non-isothermal crystallization kinetics of pure PET and the PET/BaSO4 composites. The value of Zc increased largely and the half-time of crystallization obviously shortened for the PET/BaSO4 composites. All these results indicated that crystallization ability of PET/BaSO4 composites was remarkably improved in comparison with the pure PET and BaSO4 was a better nucleation agent,especially the inorganically modified one.