纳米CaCO3对FEP非等温结晶动力学的影响

采用熔融共混法制备了聚全氟乙丙烯（FEP）/纳米碳酸钙（nano-CaCO3）复合材料，利用差示扫描量热法研究了FEP及其复合材料的非等温结晶行为，并通过Avrami方程修正的Jeziorny法、Ozawa法以及Mo法对其非等温结晶动力学进行了处理分析。结果表明，Jeziorny法及Mo法均适用于处理FEP和FEP/nano-CaCO3的非等温结晶过程，但Ozawa法不合适；在同一降温速率下，FEP/nano-CaCO3复合材料的初始结晶温度、最大结晶温度均比相应的纯FEP高，且半结晶时间延长，这说明nano-CaCO3对FEP具有一定的诱导和促进成核的作用，但由于FEP/nano-CaCO3复合材料的长链分子结构及大的空间位垒导致FEP的结晶总速率下降。

Influence of Nano-CaCO3 on Nonisothermal Crystallization Kinetics of FEP

Poly(tetrafluoroethylene-co-hexafluoropropylene)/nano calcium carbonate (FEP/nano-CaCO3) composites were prepared by melt blending method. The non isothermal crystallization behavior of the FEP and FEP/nano-CaCO3 composites were investigated by differential scanning calorimetry (DSC). Moreover, the non isothermal crystallization kinetics was carried out and analyzed by Jeziorny, Ozawa, and Mo methods. It was confirmed that the non isothermal crystallization of FEP and FEP/nano-CaCO3 could be described by the above kinetic equation except Ozawa method. The analysis showed that the initial and maximum crystallization temperatures of FEP/nano-CaCO3 composites were higher than those of neat FEP at the same cooling rate, and the addition of nano-CaCO3 extended the crystallization half time. The nano-CaCO3 promoted the nucleation of FEP, however, decreased the overall crystallization rate of the FEP.