含胆甾基偶氮液晶聚合物的合成与表征  

Synthesis and Characterization of Azobenzene Liquid Crystalline Polymers Containing Cholesteryl Groups

作　　者：姚丹姝[1] 段志娟[1] 张震[1] 孟凡宝[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）》2014年第12期1754-1757,共4页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金资助项目(51273035);中央高校基本科研业务费专项资金资助项目(N090505002)

摘　　要：将合成的含偶氮基团的液晶单体M与含胆甾基团的手性液晶单体N接枝到含氢甲基硅油上,得到系列手性偶氮类侧链液晶聚合物PY1-PY6.利用红外光谱（IR）、核磁共振谱（1HNMR）对其分子结构进行表征,采用差示扫描量热法（DSC）、偏光显微分析法（POM）、热重分析法（TG）对其介晶性能、相行为及热稳定性进行研究.结果表明,所合成的聚合物PY1-PY6为互变热致液晶,均呈现胆甾相的Grandjean织构.从PY1到PY6随着偶氮单体M含量的增加,tg呈先降后升的趋势,而ti则缓慢下降.该系列聚合物热稳定性良好,5%热失重温度在290℃以上,液晶区间在162-189℃之间.The azo monomer 4-（ allyloxybenzoyloxy ） azobenzene-4＇-ethyl formate （M） and chiral monomer 4- （allyloxybenzoyloxy） isopropionate cholesteryl （N） were grafted onto the backbone of polymethylhydrosiloxane. A new kind of azobenzene liquid crystalline polymers （PY1 - PY6 ） containing cholesteryl groups was prepared. Their chemical structures were confirmed by FT-IR and ^1 HNMR spectra, and mesomorphic properties, phase behavior and thermal stability were investigated by DSC, POM and TG. The results showed that PY1 -PY6 are thermotropic cholesteric liquid crystal and display Grandjean texture. With the increasing content of M, tg ascends after a decline, but ti descends slowly. The temperatures when 5% weight loss occurred are higher than 290 ℃ and the mesomorphic temperature ranges are 162 - 189 ℃, which reveal that PY1- PY6 have a high thermal stability and remarkable liquid crystal properties.

关 键 词：偶氮 手性 液晶聚合物 合成 

分 类 号：O631.1[理学—高分子化学]