Syntheses and properties of 1,4-bis[4-(2-amino-5-phenyl)thiazoleyl] benzene and its polyimides

1,4-Bis[4-(2-amino-4-phenyl)thiazoleyl] benzene was first synthesized from 1,4-bis(benzeneacetyl) benzene. The synthetic routes are shown in the following equations: [GRAPHICS] The structure of 1,4-bis[4-(2-amino-4-phenyl)thiazoleyl] benzene was confirmed by IR, H-1-NMR, C-13-NMR and elemental analysis. The novel polyimide(TIB) and copolyimide(TIBO) containing thiazole ring were prepared by reacting 1,4-bis[4-(2-amino-5-phenyl)thiazoleyl] benzene or/and 4,4'-diaminodiphenyl ether with 3,3',4,4'-benzophenone tetracarboxylic dianhdride. Their films exhibited good thermal oxidative stability. The decomposition temperatures in air and in nitrogen were 499, 488 degrees C (for polyimide) and 510, 498 degrees C copolyimide, respectively. The copolyimide(TIBO) film was converted into electrical conductor by pyrolysis at 1200 degrees C in nitrogen atmosphere. The room temperature conductivity for pyrolyzed TIBO was as high as 64S/m and it was very stable in air.