Patent ID: 8486579

Claim:
A method for manufacturing a polymer blend proton exchange membrane comprising the following steps: a) dissolving a soluble polymer in an organic solvent and obtaining a uniform solution, wherein the soluble polymer is at least one polymer selected from the group consisting of polysulfone, polyethersulfone and polyvinylidene fluoride; b) dissolving a sulfonated polymer in the solution obtained in step a) and obtaining a polymer blend membrane forming solution, wherein the sulfonated polymer is at least one polymer selected from the group consisting of sulfonated poly(ether-ether-ketone), sulfonated poly(ether-ketone-ether-ketone-ketone), sulfonated poly(phthalazinone ether ketone), sulfonated phenolphthalein poly (ether sulfone), sulfonated polyimide, sulfonated polyphosphazene and sulfonated polybenzimidazole, wherein the sulfonated polymer is prepared by directly dissolving an unsulfonated polymer in concentrated sulfuric acid, Nordhausen acid, or chlorosulfonic acid and sulfonating the unsulfonated polymer, wherein the sulfonated polymer is prepared by two steps: the first step is to carry out reaction for 3 to 5 hours at 20 to 40° C.; the second step is to carry out reaction for 1 to 4 hours at 70 to 100° C., and wherein the degree of sulfonation of the sulfonated polymer is in the range of 96% to 118%; and c) forming a polymer blend proton exchange membrane by tape casting the polymer blend membrane forming solution, then removing the polymer blend proton exchange membrane after being dried and heat-treated.