新型偶氮苯类树状液晶的合成及表征  

Synthesis and Characterization of a Novel Azobenzene Liquid Crystalline Dendrimer

作　　者：贺小华[1] 张晔[1] 颜德岳[1] 

机构地区：[1]上海交通大学化学化工学院,上海200240

出　　处：《功能高分子学报》2004年第4期570-574,共5页Journal of Functional Polymers

基　　金：国家自然科学基金(No.50233030)

摘　　要：采用酯化反应合成端基含8个甲氧基偶氮苯介晶基元的新型树状液晶分子,并用元素分析、核磁共 振(NMR)、红外光谱(IR)、差示扫描量热(DSC)和偏光显微镜(POM)表征树状液晶分子的结构与液晶性。 结果表明:树枝状液晶分子在76℃表现出近晶态(S)向向列态(N)转变;在137℃表现出向列态向各相同性态 转变;通过偏光显微镜观察到近晶态典型的焦锥织构,向列态典型的丝状织构。A novel liquid crystalline dendrimer with azobenzene mesogens was synthesized. The structure and properties of the liquid crystalline dendrimer were characterized by 1H-NMR, IR, element analysis, polarizing optical micrograph and DSC. The result show that the liquid crystalline dendrimer exhibited two phase transitions, one phase transition of a smectic phase to nematic phase at 76℃and the other phase transition of a nematic phase to isotropic phase at 137℃; The focal conic shaped texture during the smectic and the typic nematic schlieren texture during the nematic can be observed by using polarizing microscope.

关 键 词：偶氮苯 液晶分子 介晶基元 性态 表征 树枝状 甲氧基 新型 合成 并用 

分 类 号：O753.2[理学—晶体学] O627.41