Ionomeric membrane
AssigneeSolvay Solexis S.p.A.
InventorsAlessandro Ghielmi, Paola Vaccarono, Vincenzo Arcella
Life of this patent
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Abstract
An ionomeric membrane formed of a sulphonic (per)fluorinated ionomer wherein the sulphonic groups are at the end of short side chains (SSC), said ionomer having: equivalent weight between 700 and 1600 g/eq; side chains of formula: —O—CF2—CF2—SO331 M+, wherein M is hydrogen or an alkaline metal; said membrane having the following combination of properties: size variations, for both the orthogonal directions xy of the plane, lower than 15%, measured after dipping of the ionomeric membrane, dried at 105° C. under vacuum for one hour, in demineralized water at 100° C. for 30 minutes; the membrane, dipped at the temperature of 50° C. for 22 hours in a water/ethanol mixture containing 40% by weight of alcohol, remains integral.
Claims14
An ionomeric membrane formed of a sulphonic (per) fluorinated ionomer with sulphonic groups at the end of short side chains (SSC), having:
- equivalent weight from 700 to 1,600 g/eq, preferably from 750 to 1,200 g/eq;
- side chains of formula:
- —O—CF2—CF2—SO3−M+, wherein M is hydrogen or an alkaline metal;
- size variations, in both orthogonal directions xy of the plane, lower than 15%, more preferably lower than 10%, measured after dipping of the ionomeric membrane, dried at 105° C. under vacuum for one hour, in demineralized water at 100° C. for 30 minutes;
- remaining integral after dipping at the temperature of 50° C. for 22 hours in a water/ethanol mixture containing 40% by weight of alcohol.
Dependencies are inferred from the claim text.