邻位取代基对芳-脂族共聚酰胺热致液晶性能的影响  

EFFECT OF ORTHO SUBSTITUTED GROUPS ON THERMOTROPIC LIQUID CRYSTALLINE PROPERTIES OF AROMATIC ALIPHATIC COPOLYAMIDES

作　　者：刘德山[1] 王慧芬[1] 陈鸣飞[1] 周其庠[1] 

机构地区：[1]清华大学化学工程系

出　　处：《高分子材料科学与工程》1997年第1期57-60,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金

摘　　要：通过芳香二酰氯邻位取代基和芳香二元胺邻位取代基对所生成的大分子链的酰胺基的空间阻碍作用和脂肪族二胺与芳香族二胺的适宜配合，使大分子链的刚性和大分子链之间由酰胺基团所形成的氢键减弱，从而降低了熔融温度。Because of the steric hindrance effect of the ortho substituent of amide groups on the hydrogen bond of amide groups between the copolymer chains the melting temperature of these aromatic aliphatic copolyamides synthesized from ortho substituted aromatic diamines and aromatic diacid chloride, for example dimethylbenzidine and 2,5 dichloroterephthalyl chloride, was lower than that of nonsubstituted copolyamides. Another factor for decreasing the melting temperature of the aromatic aliphatic copolyamides was that the amount of aromatic diamine used in copolycondensation had to be reasonable accordance with the amount of the aliphatic diamine used. Three kinds of these copolyamides synthesized were thermotropic liquid crystals.

关 键 词：共聚 熔融温度 聚酰胺 热致液晶 邻位取代基 

分 类 号：O633.22[理学—高分子化学]