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. References: 28
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