中国塑料 ›› 2015, Vol. 29 ›› Issue (03): 38-44 .

• 材料与性能 • 上一篇    下一篇

纳米CaCO3对FEP非等温结晶动力学的影响

沈剑辉,林海波,向艳慧,刘富,薛立新   

  1. 中国科学院宁波材料技术与工程研究所
  • 收稿日期:2014-10-08 修回日期:2015-01-14 出版日期:2015-03-26 发布日期:2015-03-26
  • 通讯作者: 沈剑辉

Influence of Nano-CaCO3 on Nonisothermal Crystallization Kinetics of FEP

  • Received:2014-10-08 Revised:2015-01-14 Online:2015-03-26 Published:2015-03-26

摘要: 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。

关键词: 聚全氟乙丙烯, 纳米碳酸钙, 非等温结晶动力学

Abstract: 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.

Key words: poly(tetrafluoroethylene-co-hexafluoropropylene), nano calcium carbonate, nonisothermal crystallization kinetics