Novel organosoluble polyimide based on an asymmetric bis(ether amine):3, 4'-Bis(4-aminophenoxy)-benzophenone

A new kind of asymmetrical ether diamine, 3, 4'-bis(4-aminophenoxy)benzophenone (BABP), was synthesized from the nucleophilic substitution reaction of 4-chloronitrobenzene and 3, 4'-dihydroxybenzophenone in the presence of potassium carbonate, followed by catalytic reduction with SnCl2·6H₂O and concentrated hydrochloric acid. The prepared diamine was employed in the preparation of a novel polyimide containing asymmetrical diaryl ether segments via the polycondensation of it with BTDA by a two-step method. The resulting polyimide exhibits excellent solubility, film-forming capability and high thermal resistance.