▎ 摘　　要

NOVELTY - An oxidized graphene crosslinked sulfonated polyimide proton-exchange membrane is formed by synthesizing amino-terminated sulfonated polyimide by controlling proportions of dianhydride and blocked diamine, introducing amino groups on main chain of sulfonated polyimide polymer, using oxidized graphene in epoxy and carboxyl and other functional groups and end of amino group of active hydrogen reaction to carry out crosslinking and film forming mixture. USE - Oxidized graphene crosslinked sulfonated polyimide proton-exchange membrane is used for polymer electrolyte membrane fuel cell. ADVANTAGE - The oxidized graphene crosslinked sulfonated polyimide proton-exchange membrane has excellent mechanical property, hydrolysis resistance, oxidation capacity, dimensional stability and proton conductivity. DETAILED DESCRIPTION - An oxidized graphene crosslinked sulfonated polyimide proton-exchange membrane is formed by synthesizing amino-terminated sulfonated polyimide by controlling proportions of dianhydride and blocked diamine, introducing amino groups on main chain of sulfonated polyimide polymer, using oxidized graphene in epoxy and carboxyl and other functional groups and end of amino group of active hydrogen reaction to carry out crosslinking and film forming mixture. The feedstock composition of synthetic amino-terminated blocked sulfonated polyimide comprises 1 mol part dianhydride, 0.05-0.95 mol part sulfonated diamine, 0.95-0.05 mol part blocked diamine, 0.025-0.2 mol part raw material for preparing crosslinked proton-exchange membrane, 1 mol part sulfonated polyimide, 0.001-0.02 mol part amino-terminated blocked graphene oxide and 50 mol part organic solvent. An INDEPENDENT CLAIM is included for preparation of oxidized graphene crosslinked sulfonated polyimide proton-exchange membrane, which involves mechanically stirring dianhydride, sulfonated diamine and blocked diamine with m-cresol as solvent at 80 degrees C for 4 hours, heating mixture at 180 degrees C for 20 hours, cooling to 120 degrees C, adding acetone, precipitating crude amino-terminated sulfonated polyimide, adding acetone, processing mixture at 80 degrees C for 24 hours and drying in vacuum oven to form amino-terminated sulfonated polyimide, dissolving amino-terminated sulfonated polyimide in organic solvent and filtering mixture through Buchner funnel, stirring mixture at room temperature for 4 hours, adding 0.8 g polyimide and 0.0008-0.016 g graphene oxide to solution, blowing solution to glass frame of desired size and drying in baking machine, coating 40 mL solution to 10 cmx 10 cm glass frame, baking at 90 degrees C for 12 hours to obtain crude acidified crosslinked proton-exchange membrane, removing dried crosslinked membrane, immersing dried crosslinked membrane in methanol at 80 degrees C for 3 hours to remove residual organic solvent, immersing in 1 mol/mL hydrochloric acid solution at room temperature for 24 hours and acidifying product, washing acidified membrane with deionized water to neutral and drying acidified membrane in oven at 80 degrees C.