Synthesis and characterization of new aromatic polyimides containing well-defined conjugation units

A series of aromatic polyimides composed of well-defined conjugation units were synthesized from 5,5'-bis(4-aminophenyl)-2,2'-bifuryl (PFDA) and 2.2'-bis(furyl) benzidine (FurylBZ) with various dianhydrides. The synthesized polyimides emit blue to green light with a quantum yield of 7.3-14.9%. depending on the polymer backbone. In particular. PFDA-based polymers exhibit extremely narrow photoluminescence. The structure, thermal stability, refractive index and dielectric properties of the polymer films were also determined.