一类含不饱和侧链的氟代甾类液晶的合成和相变研究  

Synthesis and Mesomorphic Properties of Novel Fluorinated Steroidal Liquid Crystals Containing Unsaturated Terminal Chains

作　　者：王侃[1] 沈悦海[1] 韩腾[1] 闻建勋[1] 

机构地区：[1]中国科学院上海有机化学研究所,上海200032

出　　处：《液晶与显示》2001年第4期279-284,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金资助项目(29974038)

摘　　要：设计并合成了一类新型的甾体２，３－二氟－４－丁烯氧基苯甲酸酯液晶，其相变性质通过偏光显微镜和ＤＳＣ进行了测量和观察。结果表明末端的双键和芳香环上的氟原子取代都能降低甾体液晶的熔点和清亮点，增加中介相的温度区域，但是没有观察到手性近晶Ｃ相或其他铁电相。A series of stearyl 2, 3-difluoro-4-but-3'-ene-oxybenzoates liquid crystals were synthe- sized. Their phase transition behaviours were observed and measured by optical polarizing microscopy and DSC, respectively. The results show that both of double bonds at the end of terminal chains and fluorosubstituents on aromatic rings can decrease the melting points and viscosity and increase the range of mesophases.

关 键 词：不饱和侧链 合成 相变性质 氟代甾类液晶 甾体2 3-二氟-4-丁烯氧基苯甲酸酯液晶 

分 类 号：TN104.3[电子电信—物理电子学] O753.2[理学—晶体学]