Fluorooxidized polymeric membranes for gas separation and process for preparing them
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United States of America Patent
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Dec 17, 1991
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N/A
app pub date -
Aug 9, 1988
filing date -
Aug 9, 1988
priority date (Note) -
Expired
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Abstract
The present invention provides a surface modified polymeric gas separation membrane having improved selectivity, particularly for oxygen/nitrogen gas mixtures, prepared by forming a membrane of a polymer having the structural formula ##STR1## wherein R and R' can be the same or different linear, branched or cyclic alkyl group having one to twelve carbon atoms, or R can be H, with the proviso that both R and R' cannot be methyl, and n is at least 100, and treating the surface of the membrane with a fluoro-oxidizing agent at conditions sufficient to fluoro-oxidize the membrane surface.
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