胆甾侧链聚硅氧烷高分子液晶的合成与相行为研究

SYNTHESIS AND PHASE BEHAVIOUR OF LIQUID CRYSTALLINE POLYSILOXANE WITH CHOLESTERIC GROUP IN SIDE CHAIN

本工作利用双键与Si-H键的加成反应合成了以丙烯酸胆甾醇酯为侧链的硅氧烷梳状聚合物液晶ECS.聚合物的结构得到了核磁与红外分析的证明.偏光显微镜和DSC对ECS的相态转变研究表明,ECS在一定的温度范围内能够形成液晶相,液晶相的存在范围与聚合物的结构密切相关.

Liquid crystalline(LC) polysiloxane with cholesteric group in side chain has been prepared by a polyhydrosilylation reaction of poly(hydrogenmethylsiloxane) with a terminal alkenic cholesteric group. The structure of these polymers were confirmed by analysis of IR and NMR. Its phase transfomation was studied by optical microscope and DSC. The results showed that the polymers form a LC phase in certain temperature range, and the temperature range depends not only on the flexibility of the flexible spacer, but also the content of cholesteric side chain units. Therefore the temperature range of LC phase can be controlled by changing the content of the cholesteric side chain units and the structure of the flexible spacer.