东北大学学报:自然科学版 ›› 2014, Vol. 35 ›› Issue (12): 1754-1757.DOI: 10.12068/j.issn.1005-3026.2014.12.019

• 材料与冶金 • 上一篇    下一篇

含胆甾基偶氮液晶聚合物的合成与表征

姚丹姝, 段志娟, 张震, 孟凡宝   

  1. (东北大学 理学院, 辽宁 沈阳110819)
  • 收稿日期:2014-01-15 修回日期:2014-01-15 出版日期:2014-12-15 发布日期:2014-09-12
  • 通讯作者: 姚丹姝
  • 作者简介:姚丹姝(1965-),女,吉林长春人,东北大学教授.
  • 基金资助:
    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).

Synthesis and Characterization of Azobenzene Liquid Crystalline Polymers Containing Cholesteryl Groups

YAO Dan-shu, DUAN Zhi-juan, ZHANG Zhen, MENG Fan-bao   

  1. School of Sciences, Northeastern University, Shenyang 110819, China.
  • Received:2014-01-15 Revised:2014-01-15 Online:2014-12-15 Published:2014-09-12
  • Contact: YAO Dan-shu
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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.

关键词: 偶氮, 手性, 液晶聚合物, 合成

Abstract: 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 1HNMR 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.

Key words: azobenzene, chirality, liquid crystalline polymer, synthesis

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