Diamine monomer containing isoindigo structure and black polyimide synthesized by diamine monomer

The invention belongs to the technical field of organic polymer materials, and discloses a diamine monomer containing an isoindigo structure and black polyimide synthesized by the diamine monomer. According to the invention, halogenated indolone, halogenated isatin, alkyl halide (or acylating agent) and aminophenylboronic acid pinacol ester (or nitrophenylboronic acid pinacol ester) are used as raw materials to synthesize the dark red or black diamine monomer containing the isoindigo structure. Condensation polymerization is conducted on the synthesized diamine monomer (other diamines can be added) and aromatic dianhydride to obtain a polyamide acid solution, and thermal or chemical imidization is performed to prepare black polyimide. According to the invention, the intrinsic black polyimide is prepared from the diamine monomer containing the large-plane conjugated strong electron-withdrawing isoindigo structure, a method is simple to operate and efficient in reaction, and the black polyimide can be prepared