Synergistic regulation of dual monomers for constructing high bandgap and high-polarity polyimide with high-temperature capacitive energy storage performance

Employing a dual-monomer synergistic strategy, a wide-bandgap, high- polarity polyimide is constructed. The derived film achieves a discharge energy density of 2.68 J cm −3 with >90% efficiency at 200 °C, showing superior thermal-dielectric stability.