聚砜与热致液晶聚合物原位复合材料相变温度的研究

TRANSITION TEMPERATURES OF THERMOTROPIC LIQUID CRYSTALLINE POLYMERS AND POLYSULFONE IN SITU COMPOSITES

系统探讨了液晶聚合物的分子结构、热历史、增容剂等对聚砜和液晶聚合物原位复合体系相变温度的影响。结果表明，液晶聚合物与聚砜分子结构相似时，二者相容性较好；测试时升温速率越高，所得ＤＳＣ曲线的峰幅越大。第二次加热有利于测试玻璃化转变温度；加入增容剂，原位复合材料中二组分间相互作用增强。最后，研究了原位复合材料的热机械性能，纯聚合物的温度－形变曲线上只有一个转折点，而原位复合材料有两个分别对应于纯组分的转折点。

The effects of liquid crystalline polymers′structure, thermal history and compatibilizers on the transition temperatures of polysulfone with thermotropic liquid crystalline polymers′ in situ composites were studied. The compatibility of polysulfone and liquid crystalline polymers obeyed the similar structure rule, and it could be improved by adding block copolymers. High heating rate could get a big peak in DSC curve, and it is easy to obtain T g value by second heating. The thermal mechanical properties of these blends were also studied.