▎ 摘　　要

NOVELTY - Fused graphene cross-linked polyimide semi-interpenetrating network-type composite film comprises 1 pts. wt. amino-terminated polyimide, 2-50 pts. wt. perfluorosulfonic acid resin film, 0.005-0.05 pts. wt. graphene oxide and 20-100 pts. wt. organic solvent. USE - Used as fused graphene cross-linked polyimide semi-interpenetrating network-type composite film. ADVANTAGE - The composite film has high mechanical strength, good size stability, good controllability of the preparation technique, wide raw material source, mild technical condition, and can effectively save production cost. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing composite film, comprising (a) taking the above raw materials; (b) adding organic solvent and diamine into the reaction vessel, introducing the inert gas into the reaction vessel, stirring the mixture, adding the organic solvent and the diamine to the reaction vessel, after the reaction is completed, the product is slowly added to the acetone to precipitate, and the precipitate is extracted with acetone to remove the residual solvent, the catalyst and the small molecular weight material, and then the product vacuum drying, to obtain amino-terminated polyimide; (c) reacting amino-terminated polyimide with perfluorosulfonic acid resin film, graphene oxide, organic solvent; (d) perfluorosulfonic acid resin film was immersed in an alkaline solution, 22-26 hours after the removal, drying to constant weight, and then dissolved in a portion of the organic solvent at 140-180 degrees C, to obtain perfluorosulfonic acid resin organic solution; (e) amino-terminated polyimide is dissolved in the remaining organic solvent, mixing perfluorosulfonic acid resin organic solution at room temperature, adding graphene oxide, stir evenly, to obtain a film-forming solution; (f) film-forming solution was cast into a membrane frame at 75-90 degrees C, insulation for 4-8 hours, heated to 140-180 degrees C, so that the cross-linking reaction is complete, cooling, film is soaked in deionized water, alcohol, and then dried at 50-70 degrees C, to obtain composite film containing the semi-interpenetrating network structure; and (g) composite film containing the semi-interpenetrating network structure prepared is immersed in dilute hydrochloric acid solution for 12-48 hours, removing water, drying to constant weight.