含氟三环类液晶单体的介晶性研究  

Mesomorphism of Fluorine Substituted Liquid Crystals Containing Three Rings

作　　者：李娟利[1] 李建[1] 杜渭松[1] 邓登[1] 甘宁[1] 

机构地区：[1]西安近代化学研究所光电材料事业部,陕西西安710065

出　　处：《液晶与显示》2009年第1期9-14,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：西安近代化学研究所民品开发基金(No.08861)

摘　　要：利用差示扫描量热仪(DSC)、显微热分析仪和偏光显微镜(POM)对CCP和CPP两个系列液晶材料中含氟三环类液晶单体的介晶性进行了研究。结果表明,除CPP系列中的2CPPF3和4CPPF3外,其余所有化合物均有介晶性,在液晶态可观察到部分单体的近晶相和除2CPPF3和4CPPF3外所有单体的向列相的典型织构。探讨了烷基链碳原子数、环骨架结构以及氟原子取代数目对2个系列单体相变温度的影响规律。The mesomorphie properties of two series of fluorine substituted liquid crystals containing three rings were systematically characterized to investigate their phase transition behavior using differential scanning calorimetry（DSC）, microscopy heat analysis and polarizing optical microscopy（POM）. The results show that all the compounds except 2CPPF3 and 4CPPF3 possess mesomorphism. Typical textures of smectic and nematic phase were observed. The influence of terminal alkyl, core structure and the number of fluorine substituents on the temperature of phase transition was discussed.

关 键 词：液晶 介晶性 近晶相 向列相 织构 

分 类 号：O627.81[理学—有机化学] TN104.3[理学—化学]