高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (9): 1380.

• 论文 • 上一篇    下一篇

有机环四硅氧烷液晶的合成及其相变行为

张先亮, 罗朝晖, 卓仁禧   

  1. 武汉大学化学系, 武汉, 430072
  • 收稿日期:1994-12-01 修回日期:1995-04-12 出版日期:1995-09-24 发布日期:1995-09-24
  • 通讯作者: 张先亮,男,57岁,教授.
  • 作者简介:张先亮,男,57岁,教授.
  • 基金资助:

    国家自然科学基金

Synthesis and Phase Behavior of 1-Mesogenic Group 1,3,3,5,5,7,7-Heptamethyl-Cyclotetrasiloxanes

ZHANG Xian-Liang, LUO Zhao-Hui, ZHUO Ren-Xi   

  1. Department of Chemistry, Wuhan University, Wuhan, 430072
  • Received:1994-12-01 Revised:1995-04-12 Online:1995-09-24 Published:1995-09-24

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摘要： 两种环四硅氧烷分别和6种液晶基元化合物(M1-6)反应,合成了6种仅含1个介晶侧基的环四硅氧烷(1-6).它们的化学结构已由1HNMR、IR和元素分析证实。借助DSC和偏光显微镜观察研究了12个(M1-6和1-6)化合物的相变行为。结果表明8个化合物(M3-6和3-6)均呈现液晶相变。实验结果证明在这类液晶化合物中存在环状结构的硅氧烷不仅扩大了液晶态的温度范围,而且还有利于液晶分子的取向。

关键词: 硅氧烷, 液晶, 合成, 相行为

Abstract: Six new cyclotetrasiloxanes(1-6) with only one mesogenic group in the molecule were obtained by reacting two organocyclotetrasiloxanes with six mesogenic compounds (M1-M6) respectively. Their chemical structures were confirmed by IR, 1HNMR and elemen tal analysis. Their phase behavior was also investigated by using differential scanning calorimetry and polarizing microscopy, The results show that eight compounds(M3-M6, 3-6) exhibit liquid crystalline phase transition. The experimental results also prove that the existence of the siloxane cyclic structure can not only enlarge the temperature range of mesomorphic state in the LCcompound, but also be favorable for the LCmolecular orientation.

Key words: Siloxane, Liquid crystal, Synthesis, Phase behavior

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