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

Abstract

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.