MEMBRANES MADE FROM 6FDA, DETDA, AND DABA-BASED POLYMERS

摘要

A polymeric membrane made of a polyimide polymer or copolymer essentially consisting of repeating units of dianhydride-derived units and diamine-derived units. At least some of the dianhydride-derived units are derived from 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane (6FDA). At least some of the diamine-derived units are derived from 2,5-diethyl-6-methyl-1,3-diamino benzene (DETDA). The balance of the diamine-derived units are derived from a diamino benzene ring with a carboxylic acid substituent.

主权项

1. A membrane comprising a polyimide polymer or copolymer having repeating units of dianhydride-derived units and diamine-derived units, at least some of, and as much as 100% of, the dianhydride-derived units being the dianhydride-derived moiety of formula (I) with a balance of the dianhydride-derived units, if any, being the dianhydride-derived moiety of formula (II)wherein:
each R is a molecular segment independently selected from the group consisting of formula (1), formula (2), formula (3), and formula (4) each Z is a molecular segment independently selected from the group consisting of formula (5), formula (6), formula (7), and formula (8) at least some of the diamine-derived units are the diamine-derived moiety of formula (A) at least some of the diamine-derived units are the diamine-derived moiety of formula (B) or formula (C):and
each Ra is a straight or branched C1 to C6 alkyl group having a terminal carboxylic acid group.