Process for making cation exchange membranes with enhanced electrochemical properties
First Claim
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1. A process for making a cation exchange membrane comprising:
- impregnating a film of highly fluorinated sulfonyl fluoride polymer with a compound having the formula R-SO2 F, wherein R is a straight chain, branched or cyclic, highly fluorinated alkyl group having 1 to 30 carbon atoms;
irradiating said film after impregnating with said compound, said irradiating being carried out to provide a radiation dose in the range of about 0.1 to about 15 MRad; and
hydrolyzing said film after said irradiating.
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Abstract
A process for making a cation exchange membranes includes impregnating a film of highly fluorinated sulfonic acid polymer in sulfonyl fluoride form with a compound selected from the group having the formula R-SO2 F, wherein R is a straight chain, branched or cyclic, highly fluorinated alkyl group having 1 to 30 carbon atoms. The impregnated film is irradiated with the radiation dose being in the range of 0.1 to 15 MRad. After irradiation, the film is hydrolyzed to form the membrane. The membranes have enhanced electrochemical properties when employed in electrochemical cells including improved performance under low humidity conditions.
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6 Claims
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1. A process for making a cation exchange membrane comprising:
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impregnating a film of highly fluorinated sulfonyl fluoride polymer with a compound having the formula R-SO2 F, wherein R is a straight chain, branched or cyclic, highly fluorinated alkyl group having 1 to 30 carbon atoms; irradiating said film after impregnating with said compound, said irradiating being carried out to provide a radiation dose in the range of about 0.1 to about 15 MRad; and hydrolyzing said film after said irradiating. - View Dependent Claims (2, 3, 4, 5, 6)
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