Patent ID: 7326736
Filing Date: 2008-02-05
Classification: B01D,C08J,H01M,Y02E,Y02P

Abstract:
1. A method of preparing a composite membrane, said method comprising the steps of: (a) providing a proton exchange membrane; (b) introducing a cationic monomer into one or more desired areas of the proton exchange membrane, wherein the cationic monomer is a quaternary salt monomer that includes a cationic component and an anionic component, said cationic component being selected from the group consisting of acrylic, methacrylic and ethynyl esters of quaternary ammonium alkanes and acrylic, methacrylic and ethynyl esters of quaternary ammonium heterocycles, and wherein the quaternary salt monomer is of the formula wherein R 1 is selected from the group consisting of F and H, R 2 is selected from the group consisting of H, a methyl group and a halide, R 3 is selected from the group consisting of a methyl group and an ethyl group, n is 0-3, and A − is an anion with which the cation exhibits solubility in water; and (c) effecting the polymerization of the cationic monomer.