Fluorinated aromatic polyimide, polyamide and polyamide-imide gas separation membranes
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United States of America Patent
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Jun 14, 1994
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N/A
app pub date -
May 4, 1993
filing date -
May 4, 1993
priority date (Note) -
Expired
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Abstract
Novel fluorinated aromatic polyimide, polyamide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides, polyamides and polyamide-imides are formed from diamines of the formula ##STR1## where Ar' is any aromatic diol moiety and X is independently fluorinated alkyl groups having 1 to 6 carbon atoms, most preferably a trifluoromethyl group, m is an integer from 1 to 4, preferably 1.
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