Abstract
AbstractA series of cross‐linked polyimides (PIs) were prepared via two‐step solution polycondensation from 2,2‐bis[4‐(3,4‐dicarboxyphenoxy)phenyl]propane dianhydride (BPADA) and 2,5‐furandicarboxylic acid‐based diamines, N,N′‐bis(4‐amino‐2‐(trifluoromethyl)phenyl)furan‐2,5‐dicarboxamide (TFFDA) and N,N′‐bis(4‐aminophenyl)furan‐2,5‐dicarboxamide (p‐FDDA), followed by thermal crosslinking reaction with bismaleimide. The thermal crosslinking reaction and its mechanism were studied by FTIR spectra and model reaction analysis, which showed Diels–Alder reaction between furan group and maleimide group played a main role in the thermal treatment. The properties of cross‐linked PIs were characterized using dynamic mechanical thermal analysis, thermogravimetric analyses, tensile testing, ultraviolet‐visible spectra, and wide‐angle X‐ray diffraction. The cross‐linked polyimide film showed improved solvent‐resistance, thermal and mechanical properties with Tg values of 234–306oC, tensile strengths of 82–98 MPa and moduli of 2.3–3.0 GPa.
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