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“Liquid crystalline” thermosets from 4,4′‐bis(2,3‐epoxypropoxy)biphenyl and aromatic diamines
Author(s) -
Mormann Werner,
Bröcher Markus
Publication year - 1996
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1996.021970606
Subject(s) - mesophase , liquid crystal , biphenyl , mesogen , thermosetting polymer , liquid crystalline , polymer chemistry , isothermal process , materials science , chemistry , organic chemistry , thermodynamics , physics , optoelectronics
Pure 4,4′‐bis(2,3‐epoxypropoxy)biphenyl ( 1 ) has been synthesized and its mesophase behaviour has been investigated. 1 forms a monotropic nematic mesophase with a virtual clearing temperature of 109°C. 1 has been cured with 2,4‐diaminotoluene ( 3 ), 4,4′‐diaminobiphenyl ( 4 ), and 4‐aminophenyl 4‐aminobenzoate ( 5 ) to investigate the possibility of formation of anisotropic networks. Virtual clearing temperatures of the diamines indicate that liquid crystalline thermosets (LCT's) might be obtained with 4 and 5 . Crystallization of oligomeric products from the isotropic melt of 1 with 3 or 4 , respectively, occurred on isothermal curing without formation of a mesophase, while a nematic LCT was obtained with 5 .