SYNTHESIS AND CHARACTERIZATION OF NOVEL AROMATIC POLYAMIDES FROM 3,4-BIS(4-AMINOPHENYL)-2,5-DIPHENYLTHIOPHENE AND AROMATIC DICARBOXYLIC-ACIDS

A new highly phenylated diamine, 3,4-bis(4-aminophenyl)-2,5-diphenylthiophene, was synthesized in three steps starting from 4'-nitrodeoxybenzoin. New aromatic polyamides containing tetraphenylthiophene unit were prepared by the low temperature solution polycondensation of this diamine with various aromatic dicarboxylic acid chlorides. These polyamides had inherent viscosities of 0.20-0.35 dl g-1 and were generally soluble in various organic solvents such as N,N-dimethylacetamide, N-methyl-2-pyrrolidone, and dimethyl sulfoxide. The glass transition temperatures of the polyamides ranged from 285 to 327-degrees-C, and the 10% weight loss temperatures were observed above 530-degrees-C in nitrogen.