PET/分子筛复合材料的非等温结晶性能

Non-isothermal Crystallization Behavior of PET/Molecular Sieve Composite

采用原位聚合法制备了PET/分子筛复合材料并研究了其非等温结晶性能。结果表明 :分子筛的加入有明显的异相成核效应 ,加快了结晶速度 ,增加了结晶度 ,减小了晶粒粒径分布 ;PET及PET/分子筛体系的热结晶峰温随着降温速率的增加而移向低温 ,半结晶时间、结晶度随降温速率的增加而减小 ,晶粒粒径分布则增大 ;分子筛的加入降低了降温速率对PET半结晶时间的影响 ;随着分子筛用量的增加 ,半结晶时间t1/ 2 、结晶热焓ΔH、结晶峰半峰宽ΔW都能达到一个较佳值。

PET/molecular sieve composites were prepared by in-situ polymerization, and the non-isothermal crystallization kinetics of the composites were studied by means of DSC The results indicated that molecular sieve had obvious nucleating effect on the crystallization of PET, it could increase the crystallization rate, the crystallinity and narrow the distribution of the crystalline size.The thermal crystalline peak temperature of PET and PET/molecular sieve moved to low temperature with the increase of cooling rate,while the semi-crystalline time and crystallinity decreased with the increase of cooling rate.With the increase of the molecular sieve,the t 1/2,ΔH and ΔW would come to a better levels.