聚己内酯和乙基纤维素共混体系的环带球晶及液晶形态

聚己内酯（ＰＣＬ）中加入与其有一定混溶性的非晶组分乙基纤维素（ＥＣ），可明显影响其长环带球晶的行为．表明具有低混溶性及某种分子间相互作用的二元共混体系ＰＣＬ／ＥＣ仍能在一定温度范围内形成环带球晶；良好的混溶性，强的分子间相互作用并非是二元共混体系中ＰＣＬ长环带球晶不可缺少的因素．通过偏光显微镜发现ＰＣＬ的加入有利于乙基纤维素／二氯乙酸溶液中液晶相的形成，用Ｆｌｏｒｙ关于棒状分子无规线团溶剂三元体系的理论对其进行了讨论．

Ringed Spherulite and Lyotropic Liquid Crystal in Poly(caprolactone)/Ethyl Cellulose Blend

The compatibility, specific interaction and ringed spherulite morphology of PCL/EC blends have been studied by DSC, FTIR and optical microscopy. It is shown that the blend is characteristic of low compatibility and weak specific interaction. Distinct ringed spherulites in such a system suggest that high compatibility and strong interaction between components may not be an essential factor for their formation. Addition of PCL into the ethyl cellulose/dichloroacetic acid solution was favorable for the formation of cholesteric liquid crystalline mesophases. The results are explained in terms of Florys theory about stafflike moleculerandom chain moleculesolvent ternary system.