SYNTHESIS AND CHARACTERIZATION OF N-PHENYLATED AROMATIC POLYAMIDES FROM N-SILYLATED DIANILINO COMPOUNDS AND AROMATIC DIACID CHLORIDES

N-Phenylated aromatic polyamides of high molecular weights were synthesized by the high-temperature solution polycondensation of N,N prime -di(trimethylsilyl)-substituted dianilino compounds derived from p-dianilinobenzene, bis(4-anilinophenyl) ether, and alpha , alpha prime -dianilino-p-xylene, with isophthaloyl and terephthaloyl chloride. Almost all of the N-phenylated polyamides were amorphous, and soluble in a variety of organic solvents including dimethylformamide, m-cresol, and chloroform. Transparent and flexible films of these polymers could be cast from the dimethylformamide solutions. Four wholly aromatic polyamides had glass transition temperatures in the range of 195-255 degree C, and began to lose weight around 400 degree C in air.