▎ 摘　　要

NOVELTY - Preparing modified phthalonitrile resin-based composite material comprises mixing phthalonitrile resin with graphene oxide, modifying to obtain modified phthalonitrile resin, mixing modified phthalonitrile resin with bismaleimide to obtain a prepreg, disposing carbon fibers in the prepreg for impregnation to obtain prepregs layering prepregs and laid, pressing and curing are performed in sequence. USE - Used as modified phthalonitrile resin base composite material. ADVANTAGE - The preparation improves the mechanical property and thermal stability of the phthalonitrile resin, bismaleimide resin is replaced by toxic and low melting point solvent, which avoids the environment pollution. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for modified phthalonitrile resin-based composite material prepared by the preparation method.