Hybrid films of novel fluorinated polyimides and hyperbranched cyclotriphosphazene polymer for enhanced flame retardancy, thermomechanical properties, and reduced dielectric constant

This study synthesizes novel polyimide (B2FO PI) films using 4,4'-(1,4-phenyleneisopropylidene)diphenoxy bis(2-(trifluoromethyl)-4-aminobenzene) (B2FDA) and 4,4'-oxydiphthalic anhydride (ODPA), as well as polyimide (PI) hybrid films incorporating a hyperbranched fluorinated cyclotriphosphazene polymer. The findings indicate that incorporating the hyperbranched cyclotriphosphazene significantly enhances the hybrid films' performance by increasing the cross-linking density of the polyimide chains. Moreover, the hybrid PI films demonstrate excellent water resistance, superior thermomechanical properties, enhanced flame-retardant characteristics, and a low dielectric constant.