Alpha, beta, beta-trifluorostyrene-based composite membranes
AssigneeBallard Power Systems Inc.
InventorsAlfred E. Steck, Charles Stone
Life of this patent
Estimating the term…
Abstract
A composite membrane is provided in which a porous substrate is impregnated with a polymeric composition comprising various combinations of α,β,β-trifluorostyrene, substituted α,β,β-trifluorostyrene and ethylene-based monomeric units. Where the polymeric composition includes ion-exchange moieties, the resultant composite membranes are useful in electrochemical applications, particularly as membrane electrolytes in electrochemical fuel cells.
Claims5
A composite membrane comprising a porous substrate impregnated with one or more polymeric compositions selected from the group consisting of:
- (a) a sulfonated copolymer of 60 ,β,β-trifluorostyrene and m-trifluoromethyl-60 ,β,β-trifluorostyrene;
- (b) a sulfonated polymer of 60 ,β,β-trifluorostyrene;
- (c) a copolymer of 60 ,β,β-trifluorostyrene, m-trifluoromethyl-60 ,β,β-trifluorostyrene and p-sulfonyl fluoride-60 ,β,β-trifluorostyrene;
- (d) a sulfonated copolymer of 60 ,β,β-trifluorostyrene and p-fluoro-60 ,β,β-trifluorostyrene;
- (e) a copolymer of 60 ,β,β-trifluorostyrene, p-fluoro-60 ,β,β-trifluorostyrene and p-sulfonyl fluoride-60 ,β,β-trifluorostyrene.
A composite membrane consisting essentially of a porous substrate impregnated with one or more polymeric compositions selected from the group consisting of:
- (a) a sulfonated copolymer of 60 ,β,β-trifluorostyrene and m-trifluoromethyl-60 ,β,β-trifluorostyrene;
- (b) a sulfonated polymer of 60 ,β,β-trifluorostyrene;
- (c) a copolymer of 60 ,β,β-trifluorostyrene, m-trifluoromethyl-60 ,β,β-trifluorostyrene and p-sulfonyl fluoride-60 ,β,β-trifluorostyrene;
- (d) a sulfonated copolymer of 60 ,β,β-trifluorostyrene and p-fluoro-60 ,β,β-trifluorostyrene;
- (e) a copolymer of 60 ,β,β-trifluorostyrene, p-fluoro-60 ,β,β-trifluorostyrene and p-sulfonyl fluoride-60 ,β,β-trifluorostyrene.
Dependencies are inferred from the claim text.