Citation: SHAN Guorong, PAN Zhicun, LIU Deshan, ZHOU Qixiang. LIQUID CRYSTALLINE BEHAVIOR OF AROMATIC COPOLYAMIDE IN CONCENTRATED SULPHURIC ACID[J]. Chinese Journal of Polymer Science, ;1997, 15(2): 114-122. shu

LIQUID CRYSTALLINE BEHAVIOR OF AROMATIC COPOLYAMIDE IN CONCENTRATED SULPHURIC ACID

SHAN Guorong ^{**，潘智存} ,
PAN Zhicun ,
LIU Deshan ,
ZHOU Qixiang

Received Date: 5 December 1995

The liquid crystalline behavior of anisotropic solutions in 100% sulphuric acid ofaromatic copolyamide obtained by low-temperature solution copolycondensation of tere-phthalic acid chloride (TPC), p-phenylene diamine (PPD) and 4, 4'-diamino-diphenylether(DAPE) has been studied by optical microscopy and X-ray diffeaction. The effects ofinherent viscosity, concentration of copolyamide in sulphuric acid, the content of the thirdmonomer (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.
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