Composite ionomeric membrane
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United States of America Patent
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Oct 20, 2015
Grant Date -
May 24, 2012
app pub date -
Feb 2, 2012
filing date -
Mar 17, 2005
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Abstract
A composite ionomeric membrane comprising a layer or film of a porous inert material on which a (per) fluorinated sulphonic ionomer is deposited wherein the sulphonic groups are at the end of short side chains (SSC), said ionomer having:
- equivalent weight comprised between 280 and 1,700 g/eq;side chains of formula: —O—CF2—CF2—S03−M+, wherein M is hydrogen or an alkaline metal;said membrane having in each of the two orthogonal directions xy of the plane, after dipping in demineralized water at 100° C. for 30 minutes and preliminary drying at 105° C. under vacuum for one hour, the following size variations:in one direction, size variation lower than 25%;in the other direction, size variation lower than 20%.
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