一个判别液晶聚合物状态的新方法

A New Method for Judging the Phase States of Liquid Crystalline Polymers

伴随液晶相转变而产生的转变焓、转变熵可提供有关各相的结构、状态及有序度等信息.本文从动力学、热力学角度分析了液晶聚合物从各向同性熔体冷却时系统的热熵变化,建立了液晶聚合物升降温过程中的热熵图,提出了定量判断液晶聚合物从各向同性熔体冷却后所处状态的新方法.

The phase states of thermotropic liquid crystalline polymers (LCPs) cooled from isotropic melt were analyzed on the basis of thermodynamics and kinetics. The thermal entropy scheme of LCPs on heating and cooling was established. And a new method for judging the phase states of LCPs was proposed. The method was applied to a series of polyesters, and the phase states of the polyesters cooled from isotropic melt were obtained.