含吸电子基的手性液晶聚合物合成和性能  

Synthesis and Properties of Chiral Liquid Crystal Polymers Containing Electron-Withdrawing Group

作　　者：何晓智[1] 穆强[1] 赵静[1] 张宝砚[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2011年第1期110-113,共4页Journal of Northeastern University(Natural Science)

基　　金：中央高效基本科研业务费专项资金资助项目(N090405005);沈阳市科技基金资助项目(F10-205-1-30);辽宁省博士科研启动基金资助项目(20101033)

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.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.

关 键 词：手性 胆甾相 聚合物 合成 油丝织构 

分 类 号：O631.1[理学—高分子化学]