噻二唑类弯曲型液晶分子的合成和性能研究  

Synthesis and Property of Bent-Core Liquid Crystals with Thiadiazole

作　　者：李双全[1] 沈冬[1] 

机构地区：[1]华东理工大学理学院化学物理研究室,上海200237

出　　处：《液晶与显示》2011年第4期421-426,共6页Chinese Journal of Liquid Crystals and Displays

基　　金：国家自然科学基金(No.60878047)

摘　　要：合成了两个系列以1,3,4-噻二唑为中心基团的弯曲型分子,结合偏光显微熔点仪(POM)观察和差示量热扫描法(DSC)研究了它们的液晶性能。研究发现,这两类弯曲型分子都会出现N相。其中,对称型五环酯类噻二唑弯曲型分子的熔点都较高,清亮点均超过360℃;含烯丙基非对称噻二唑类弯曲型分子熔点和清亮点温度大幅度降低,N相的温区较宽,以庚基为端基链的弯曲型分子出现N相的温度区间超过120℃。Two series of bent-core liquid crystals with 1,3,4- thiadiazole as the center unit were synthesized, their liquid crystalline properties were studied by POM and DSC. It is found that both of these two serie thiadiazole compounds exhibite N phase. Among them, the symmetric five benzene ring thiadiazole ester compounds have rather high melting points, the clearing temperatures are more than 360 °C. The melting points and clearing temperatures of the asymmetric thiadiazole molecules with allyl terminal chains are significantly reduced, and the bent-core molecule with heptyl as terminal groups shows N phase at a very wide temperature range （〉120 °C）.

关 键 词：1  3  4-噻二唑 弯曲型分子 向列相 

分 类 号：O753.2[理学—晶体学]