作　　者： ; ; ; ;

机构地区： 郑州大学化学与分子工程学院

出　　处： 《高分子学报》 1990年第1期51-59,共9页

摘　　要： 以4,4′-(烷撑二酰氧)二苯甲酰氯和2,5-二羟基-1,4-苯撑双-(对乙氧基苯甲酸酯)为单体,采用低温缩聚方法,合成了含X-型液晶基元和不同柔性链长度的主链型液晶聚合物。聚合物的液晶行为用DSC、偏光显微镜和X-光衍射进行了表征。对于样品升温消光后又重新出现双折射的异常现象,初步认为是加热过程中分子量提高的结果。 The main chain liquid cryatal polymers with X-shaped mesogens and different flexible spacers were synthesized by solution polycondensations using the monomers 4, 4'-(alkylen-edioyldioxy) dibenzoyl dichloride and 2, 5-dihydroxyl-1, 4-phenylene di-p-ethoxybenzoate. The liquid-crystalline behaviour of the polymers was characterized by DSC, polyarizing microscope and X-ray diffractometre. It was found that at a temperature not much higher than the clearing point of the polymer melts the birefringence will reccur in a few minutes, This unusual behaviour of these polymers is explained as the result of molecular weight increase in the heating process.

关 键 词： 液晶 液晶高分子 型液晶基元

领　　域： [理学]