硅氧烷胆甾接枝聚合物液晶PHECS和PHPCS的红外光谱研究

IR SPECTRA OF LIQUID CRYSTALLINE POLYSILOXANES WITH CHOLESTERIC GROUP IN SIDE CHAIN

利用变温红外(IR)光谱分析技术研究了硅氧烷胆甾接枝聚合物液晶 PHECS 和 PHPCS.PHECS 和 PHPCS 的 IR 光谱随其相态的转变而发生变化,分析了特征峰强度随温度的变化规律,讨论了聚合物的组成对形成液晶相和结晶相的作用。结果表明,液晶相和结晶相的不同在于胆甾基团的不同排列。

Liquid crystalline(LC)polysiloxane with cholesteric group inside chain has been prepared by a polyhydrosilylation reaction of poly(hydro-genmethylsiloxane)with a terminal alkenic cholesteric group.IR spectra incrystalline,liquid-crystalline and fluid isotropic phases were studied.By ana-lyzing the temperature dependence of the spectra intensity,the effect of thecholesteric side chain on the crystalline and liquid-crystalline statcs were exam-ined.The results show that the cholesteric group plays an important role in therealization of the crystallinc and liquid-crystalline phase,and the differencebetween the crystal and the liquid-crystal is determined by the different orien-tational arrangement of the cholesteric group.