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Thermal cross‐link between 2,5‐furandicarboxylic acid‐based polyimides and bismaleimide via Diels–Alder reaction
Author(s) -
Ma Kai,
Chen Guofei,
Zhang Yonggang
Publication year - 2020
Publication title -
journal of polymer science
Language(s) - English
Resource type - Journals
eISSN - 2642-4169
pISSN - 2642-4150
DOI - 10.1002/pol.20200538
Subject(s) - maleimide , polyimide , thermogravimetric analysis , furan , materials science , polymer chemistry , diels–alder reaction , condensation polymer , chemistry , organic chemistry , composite material , polymer , catalysis , layer (electronics)
A 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 T g values of 234–306 o C, tensile strengths of 82–98 MPa and moduli of 2.3–3.0 GPa.