LIQUID CRYSTALLINE BEHAVIOR OF AROMATIC COPOLYAMIDE IN CONCENTRATED SULPHURIC ACID  

作　　者：单国荣 潘智存 刘德山 周其庠 

机构地区：[1]Department of Chemical Engineering, Tsinghua University, Beijing 100084 Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027 [2]Department of Chemical Engineering, Tsinghua University, Beijing 100084

出　　处：《Chinese Journal of Polymer Science》1997年第2期114-122,共9页高分子科学（英文版）

摘　　要：The liquid crystalline behavior of anisotropic solutions in 100% sulphuric acid of aromatic copolyamide obtained by low-temperature solution copolycondensation of terephthalic acid chloride (TPC), p-phenylene diamine (PPD) and 4, 4'-diamino-diphenylether (DAPE) has been studied by optical microscopy and X-ray diffraction. The effects of inherent viscosity, concentration of copolyamide in sulphuric acid, the content of the third monomer (DAPE) and sequence distribution of copolyamide on the critical concentration, isotropic temperature, phase diagram and texture of liquid crystal were investigated. The schlieren texture was observed and the results of X-ray diffraction indicate that the concentrated solutions of copolyamide exhibit nematic liquid crystalline behavior.The liquid crystalline behavior of anisotropic solutions in 100% sulphuric acid of aromatic copolyamide obtained by low-temperature solution copolycondensation of terephthalic acid chloride (TPC), p-phenylene diamine (PPD) and 4, 4'-diamino-diphenylether (DAPE) has been studied by optical microscopy and X-ray diffraction. The effects of inherent viscosity, concentration of copolyamide in sulphuric acid, the content of the third monomer (DAPE) and sequence distribution of copolyamide on the critical concentration, isotropic temperature, phase diagram and texture of liquid crystal were investigated. The schlieren texture was observed and the results of X-ray diffraction indicate that the concentrated solutions of copolyamide exhibit nematic liquid crystalline behavior.

关 键 词：liquid crystalline behavior aromatic copolyamide 

分 类 号：O631.3[理学—高分子化学]