Partially Bio-based Colorless and Transparent Poly(amide-imide)s Derived from 2,5-Furandicarboxylic Acid

Two series of partially bio-based colorless and transparent poly(amide-imide)s (CPAIs) derived from bio-based 2,5-furandicarboxylic acid (FDCA) were synthesized by a two-step condensation reaction. 4,4′-(Hexafluoroisopropylidene) diphthalic anhydride, 2,2′-bis(trifluoromethyl)benzidine, and terephthaloyl chloride were used as basic monomers for the CPAIs. The highest bio-based content of the CPAIs was 11.32%. With increasing contents of FDCA units in the CPAIs, their glass transition temperatures and mechanical properties decreased gradually due to the decreased intermolecular interactions, whereas their transparency and yellowness indices were not significantly affected. The overall properties of the CPAIs are believed to be suitable for applications in optoelectronic device industries.