全芳香族热致液晶聚合物与热塑性树脂聚砜的原位复合材料

IN SITU COMPOSITES OF WHOLLY AROMATIC THERMOTROPIC LIQUID CRYSTALLINE POLYMERS WITH THERMOPLASTIC POLYSULFONE

用自制的四种全芳香族热致液晶聚合物ＢＰＬＣＰ、ＢＰＭＬＣＰ、ＢＰＡＬＣＰ、ＢＰＳＬＣＰ与热塑性树脂聚砜（ＰＳＦ）熔融共混，制备了一系列原位复合材料．研究了所得材料的微观形态、热性能、力学性能等，结果显示：四种液晶聚合物中，ＢＰＬＣＰ，ＢＰＳＬＣＰ在所用加工条件下可在ＰＳＦ中取向成纤，而且这两种共混物断面上存在皮核效应；ＢＰＭＬＣＰ和ＢＰＡＬＣＰ未成纤，均以球状存在于ＰＳＦ中．这四种液晶聚合物与ＰＳＦ的相容性较差，各共混物的Ｔｇ均分别接近于二纯组分的Ｔｇ值，ＳＥＭ照片上明显的相界面也能说明以上问题．液晶聚合物对ＰＳＦ有增强作用，但增强效果不很显著。

A series of in situ composites were obtained by melt blending a thermoplastic resin polysulfone(PSF) and four kinds of whollyaromatic thermotropic liquid crystalline polymers which composed of terephthalic acid(TPA),m phthalic acid(MPA),p hydroxybenzoic acid (PHB) and a bisphenol monomer.There are four kinds of bisphenol monomers:4,4′ dihydroxy bisphenyl(BP),4,4′ dihydroxybisphenyl methane(BPM),bisphenol A (BPA),4,4′ dihydroxy bisphenylsulfone(BPS),corresponding liquid crystalline polymers (LCP) were represented by BP LCP,BPM LCP,BPA LCP,BPS LCP respectively.The morphology,thermal property and mechanical properties of these in situ composites were studied.The results showed that BP LCP and BPS LCP could form fibrous structure in PSF resin,and skin core effect appeared on their fracture surface.BPM LCP and BPA LCP only had spherical shape.The compatibility of these liquid crystalline polymers(LCPs) and PSF was poor.The mechanical properties of PSF were improved by adding these LCPs,especially by adding BP LCP.