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采用示差扫描量热法研究PP、PP/TPU、PP/TPU/纳米SiO2复合材料的非等温结晶动力学。采用Jeziorny法、Ozawa法和莫志深法研究结晶动力学参数。研究发现Ozawa法不适合处理PP及其复合材料的非等温结晶行为,而Jeziorny法和莫志深法则能很好处理。结果表明:TPU和纳米SiO2起到异相成核的作用,使PP的结晶峰温升高,结晶速率加快。TPU和纳米粒子的填充使PP的结晶活化能增大。
The non-isothermal crystallization kinetics of PP, PP / TPU and PP / TPU / nano-SiO2 composites were investigated by differential scanning calorimetry. Crystallization kinetics parameters were studied using the Jeziorny method, the Ozawa method, and the Morozai method. The study found that the Ozawa method is not suitable for the non-isothermal crystallization behavior of PP and its composites, while the Jeziorny method and Morozim’s law can be handled well. The results show that TPU and nano-SiO2 play the role of heterogeneous nucleation, and the crystallization peak temperature of PP is increased and the crystallization rate is accelerated. The filling of TPU and nanoparticles increases the crystallization activation energy of PP.