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Liquid crystalline thermosets from triaromatic ester group containing diepoxides and aromatic diamines
Author(s) -
Mormann Werner,
Bröcher Markus
Publication year - 1998
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/(sici)1521-3935(19980501)199:5<853::aid-macp853>3.0.co;2-s
Subject(s) - mesogen , liquid crystal , mesophase , monomer , thermosetting polymer , polymer chemistry , liquid crystalline , melting point , materials science , phenylene , chemistry , crystallography , organic chemistry , polymer , optoelectronics
Three novel triaromatic diepoxides, 1,4‐phenylene bis(4‐(2,3‐epoxypropoxy)benzoate) ( 1 ), methyl‐1,4‐phenylene bis(4‐(2,3‐epoxypropoxy)benzoate) ( 2 ), and chloro‐1,4‐phenylene bis(4‐(2,3‐epoxypropoxy)benzoate) ( 3 ), were synthesized and their mesogenic properties studied. 1 and 2 were reacted with 4,4′‐diaminobiphenyl ( 4 ), 4‐aminophenyl 4‐aminobenzoate ( 5 ), and 4,4′‐diaminodiphenylmethane ( 6 ) to investigate the formation of anisotropic networks. The influence of the curing conditions and of the structure of monomers and amines on the formation of liquid crystalline thermoset (LCT) networks has been studied. All combinations give nematic networks. The temperature range in which nematic melts and LCT are formed is determined by complete melting of the mixture and by its clearing point, which is in good agreement with the value calculated from the clearing points of the monomers. Orientation of initially liquid crystalline mixtures is better than the orientation of mixtures which form the mesophase starting from an isotropic melt.