Title:
METHOD FOR PRODUCING A MEMBRANE MADE OF BRIDGED POLYMER AND A FUEL CELL
Document Type and Number:
WIPO Patent Application WO2002070592
Kind Code:
A3
Abstract:
The invention relates to a membrane made of a bridged polymer produced by a method comprising the following steps: a) production of a solution comprising an alkaline polymer that contains at least one amino acid in a repeat unit and at least one bridging reagent in a suitable solvent, b) pouring of a film using the solution obtained in step a), c) accomplishment of the bridging reaction in the film obtained according to step c), d) doping of the film obtained according to step d) with a strong acid. The method is characterised in that in step a) an alkaline catalyst is also added. The inventive membrane displays visibly improved fracture toughness (elongation at rupture/tension) with near unaltered swelling behaviour. The inventive membranes are suitable for producing membrane-electrode-units for fuel cells.
Inventors:
UENSAL OEMER (DE)
KIEFER JOACHIM (DE)
KIEFER JOACHIM (DE)
Application Number:
PCT/EP2002/002215
Publication Date:
December 27, 2002
Filing Date:
March 01, 2002
Export Citation:
Assignee:
CELANESE VENTURES GMBH (DE)
UENSAL OEMER (DE)
KIEFER JOACHIM (DE)
UENSAL OEMER (DE)
KIEFER JOACHIM (DE)
International Classes:
C08J5/22; H01M8/1246; (IPC1-7): C08J5/22; H01M8/10
Domestic Patent References:
| WO2000044816A1 | 2000-08-03 |
Foreign References:
| US5599639A | 1997-02-04 |
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