Back to results
US 7,235,320 B2Granted
Proton-conducting membrane and use thereof
AssigneePEMEAS GmbH
InventorsGordon Calundann, Michael J. Sansone, Oemer Uensal, Joachim Kiefer
Life of this patent
Estimating the term…
Abstract
The present invention relates to a novel proton-conducting polymer membrane based on polyazoles which can, because of its excellent chemical and thermal properties, be used in a variety of ways and is particularly useful as polymer electrolyte membrane (PEM) to produce membrane electrode units for PEM fuel cells.
Claims40
A proton-conducting polymer membrane based on polyazoles which is obtained by a process comprising the steps
- A) Reacting one or more aromatic tetraamino compounds with one or more aromatic carboxylic acids or esters thereof which contain at least two acid groups per carboxylic acid monomer, or of one or more aromatic and/or heteroaromatic diaminocarboxylic acids in the melt at temperatures of up to 350° C.,
- B) Dissolution of the solid prepolymer obtained as described in step A) in polyphosphoric acid,
- C) Heating of the solution obtained as described in step B) to temperatures of up to 300° C., under inert gas to form the dissolved polyazole polymer,
- D) Formulating a membrane on a support using the solution of the polyazole polymer from step C), and
- E) Treating the membrane formed in step D) until it is self-supporting.
2 more elements
An electrode provided with a proton-conducting polymer coating based on polyazoles which is obtained by a process comprising the steps
- A) Reacting one or more aromatic tetraamino compounds with one or more aromatic carboxylic acids or esters thereof which contain at least two acid groups per carboxylic acid monomer, or of one or morn aromatic and/or heteroaromatic diaminocarboxylic acids in the melt at temperatures of up to 350° C.,
- B) Dissolution of the solid prepolymer obtained as described in step A) in polyphosphoric acid,
- C) Heating of the solution obtained as described in step B) to temperatures of up to 300°C., under inert gas to form the dissolved polyazole polymer,
- D) Application of a layer to an electrode using the solution of the polyazole polymer from step C), and
- E) Treating the layer formed in step D).
2 more elements
Dependencies are inferred from the claim text.