热致液晶聚酰胺的合成和液晶行为  

Synthesis and Liquid Crystalline Behaviour of Thermotropic Polyamides

作　　者：刘德山[1] 陈鸣飞[1] 周其痒 

机构地区：[1]化学工程系

出　　处：《清华大学学报（自然科学版）》1989年第6期1-6,共6页Journal of Tsinghua University(Science and Technology)

摘　　要：为了降低聚酰胺的熔融温度，运用分子设计的方法，采用芳香族和脂肪族两类二元胺共缩聚，成功地合成了三个系列的热致液晶聚酰胺。这些共聚酰胺具有３００℃以下的熔融温度１００℃以上液晶温度范围和稳定的液晶相。通过偏光显微镜、Ｘ光衍射分析和ＤＳＣ分析等手段，确认上述热致共聚酰胺液晶为向列型液晶。Three series of thermotropic aromatic-aliphatic copolyamide liquid crystals were synthesized by low temperature solution polycondensation. 1. 1, 10-decamethylenediamine (DMDA) -4, 4' (3, 3 '-dimethylbis-phenylenediamine ) (DMBPDA)--2,5-dichloroterephthal chloride(DCTPC);2. DMBP- DA-terephthalyl chloride(TPC); 3. 1,8-octamethylenediamine (OMDA)- DMBPDA-DCTPC. The range of the critical amount of aromatic diamine used should be 20%-40% (mol) for these thermotropic liquid crystalline copolyamides. The thermotropic liquid crystalline behaviour of these copolyamides was studied by polarizing microscope, X-ray diffraction and DSC. The results showed that the liquid crystalline temperature range of these copolyamides is more than 100℃ and the mesogenic phase is stable. These copolyamide liquid crystals are nematic.

关 键 词：热致液晶 聚酰胺 合成 液晶行为 向列型 分子设计 

分 类 号：O633.22[理学—高分子化学]