【摘要】 设计与合成含胆甾醇基的液晶单体(4-烯丙氧基苯丙酸胆甾醇酯(M1)与含氰基的液晶单体(4-十一烯酰氧基联苯氰酯(M2)),并将其以一定比例投料与聚甲基含氢硅氧烷(PMHS)接枝共聚,合成了一系列含吸电子基的手性侧链液晶聚合物.通过热分析、偏光显微分析、旋光仪等测试手段研究了单体M1,M2和手性液晶聚合物液晶性能.结果表明M1为胆甾型液晶单体,M2为向列液晶单体.聚合物P1为近晶相液晶聚合物,P2~P8为手性近晶A相液晶聚合物.随着M1含量的增加,聚合物的玻璃化转变温度、清亮点温度均呈现增大趋势,液晶相范围较宽.更多还原

【Abstract】 The liquid crystalline monomers:M1(4-allyloxy-phentylpropionyloxycholesterol ester) and M2(4-undecanoyloxy-4-cyanogen-biphenyl ester) were synthesized.Then,a series of chiral liquid crystalline polymers containing electron withdrawing groups were prepared via graft copolymerization with the dosages of M1,M2 and PMHS(polymethylhydrosiloxane) as backbone in a certain proportion.The chemical structures of both the monomers and polymers thus obtained were confirmed by FT-IR and 1H NMR spectra,and the mesomorphic properties were investigated by DSC,POM,TG and X-ray.Experiment results showed that M1 and M2 are cholesteric and nematic liquid crystal monomers,respectively,and polymer P1 smectic but P2~P8 are chiral smectic A polymers.Furthermore,the glass transition and clearing points of the polymers tend to increase with the increasing content of M1,with a wide range of liquid crystalline phase provided.更多还原