液晶离聚物的合成及其原位复合纤维形态研究

SYNTHESIS OF LIQUID CRYSTALLINE IONOMERS AND THE MORPHOLOGY OF THEIR IN-SITU COMPOSITE FIBERS

以 PET、PET磺酸型离聚物 (SPET)和对乙酰氧基苯甲酸 (PABA)为原料合成了一系列共聚酯离聚物 ,经表征表明产物是热致液晶聚合物 (TL CP)。不同离子含量的液晶离聚物与不同极性的热塑性聚合物基体共混纺丝得到原位复合纤维 ,经形态分析表明 ,液晶离聚物分子中的离子和基体分子中的偶极之间的相互作用改善了两相间的相容性 ,使液晶分散相分布均匀且形成长径比更大的微纤 ;离子含量越高 ,基体极性越强 ,这种效应越明显 ;但微纤细到一定程度时容易破裂而使分散相成球粒状分布 。

A series of copolyester ionomers were synthesized with PET, Sulphonated PET ionomer and PABA. They were thermotropic liquid crystalline polymers(TLCP), which was characterized. These liquid crystalline ionomers containing various contents of ionic group were blended with two matrixes of different molecular polarity and co extruded into in situ composite fibers. It is indicated by analysis of morphology and mechanical property of the fibers that the ion dipole interaction between two phases excites their compatibility, then the TLCP phase disperses more uniformly as fibrils with larger L/D ratio. The interaction is more effective in the case of higher ion content and stronger polar matrix. However, when the fibrils are too thin to avoid breakuping into small droplets, the reinforcement will be destroyed.