Synthesis and Characterization of High-Temperature Fluorine-Containing PMR Polyimides

Abstract

The synthesis and characterization of novel fluorine-containing PMR polyimides derived from the diethyl ester of 4,4‘-(2,2,2-trifluoro-1-phenylethylidene)diphthalic acid, p -phenylenediamine, and the monoethyl ester of cis -5-norbornene- endo -2,3-dicarboxylic acid in low boiling solvents were described. The fluoropolyimide resin solutions are stable for several weeks at room temperatures and can easily impregnate carbon fibers to prepare prepregs. The molded resins exhibit outstanding thermal and thermooxidative stabilities at temperatures as high as 350 °C.