含氟与胆甾醇基液晶聚合物的合成与表征  

Synthesis and Characterization of Liquid Crystalline Polymers Containing Fluorine and Cholesteryl Units

作　　者：廉娇[1] 柴国卫[1] 王宏光[1] 孟凡宝[1] 

机构地区：[1]东北大学理学院,辽宁沈阳110004

出　　处：《高分子材料科学与工程》2010年第11期1-4,共4页Polymer Materials Science & Engineering

基　　金：教育部新世纪优秀人才支持计划资助项目(NECT-08-0100)

摘　　要：将一种含胆甾醇基液晶单体、一种含氟单体与聚甲基含氢硅氧烷接枝共聚合成了一系列液晶聚合物。采用红外光谱(FT-IR)、核磁共振(1H-NMR)、偏光显微镜(POM)、X射线衍射(WXRD)与差示扫描量热分析(DSC)等测试手段,对单体及聚合物进行了结构与性能的表征。随着含氟基团组分含量逐渐增加,该系列液晶聚合物的玻璃化转变温度与清亮点都呈现降低趋势,并且液晶相由胆甾相转变为近晶相。由于含氟部分和聚合物中的碳氢部分极难相容,形成层状聚集,从而使胆甾相受到抑制,有利于近晶相的形成和稳定。Series of side-chain liquid-crystalline （LC） polymers were graft polymerized by use of cholesteryl 4-allyloxybenzoate,（3-trifluoromethyl）-phenyl 4-allyloxybenzoate and poly（methylhydrogeno）siloxane.The chemical structures,composition and LC properties of the monomers and polymers were characterized by use of various experimental techniques such as Fourier transform infrared spectrum（FT-IR）,1H nuclear magnetic resonance spectrum（1H-NMR）,polarization microscope（POM）,X-ray diffraction analysis.With increase of the fluorinated groups in the polymer systems,the temperatures of glass transition and clear point decreased,and the mesophases of the polymers changed from cholesteric phase to smectic phase.Due to the fluorinated groups and carbon hydrides are not compatible,laminated structrure should be formed easily,resulting in inhibiting cholesteric phases and stabilizing smectic phases.

关 键 词：液晶聚合物 氟化高分子 胆甾相 近晶相 

分 类 号：O631.1[理学—高分子化学]