Preparation and Properties of Novel Triphenylpyridine-Containing Hyperbranched Polyimides Derived from 2,4,6-Tris(4-aminophenyl)pyridine under Microwave Irradiation

A novel BB2'-type triamine was synthesized for the first time and employed to prepare a series of amine- and anhydride-terminated triphenylpyridine-containing hyperbranched polyimides under microwave irradiation. The structure of the triamine monomer and polymers were verified by FTIR and H-1 NMR spectroscopy. The predominantly amorphous polyimides were soluble in m-cresol, NMP, DMSO, DMAc and DMF at room temperature or upon heating. The polymers showed glass transition temperatures above 310 degrees C and a 5 and 10% weight-loss temperature above 482 and 559 degrees C. Tensile strength and modulus were higher than 53.1 MPa and 1.01 GPa, respectively. AM-HBPI-2 and AD-HBPI-2 showed UV-Vis absorptions in the region 200-400 and 200-350 nm and displayed strong purple and blue fluorescence.