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

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A novel BB'_ 2 ‐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 1H 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 °C and a 5 and 10% weight‐loss temperature above 482 and 559 °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. magnified image