Proton-conducting membrane and use thereof

A proton-conducting polymer membrane based on polyazoles which is obtained by a process comprising the steps of

• A) reacting one or more aromatic tetramino compounds with one or more aromatic carboxylic acids or their esters which contain at least two acid groups per carboxylic acid monomer, or one or more aromatic and/or heteroaromatic diaminocarboxylic acids in the melt at temperatures of up to 350° C.,
• B) dissolving the solid prepolymer obtained in accordance with step A) in an organic phosphonic anhydrides with formation of a solution and/or dispersion,
• C) heating the solution obtainable in accordance with step B) under inert gas to temperatures of up to 300° C. with formation of the dissolved polyazole polymer,
• D) forming a membrane using the solution of the polyazole polymer in accordance with step C) on a support and
• E) treating the membrane formed in step D) until it is self-supporting.

An electrode having a proton-conducting polymer coating based on polyazoles which can be obtained by a process comprising the steps of

• A) reacting one or more aromatic tetramino compounds with one or more aromatic carboxylic acids or their esters which contain at least two acid groups per carboxylic acid monomer, or one or more aromatic and/or heteroaromatic diaminocarboxylic acids in the melt at temperatures of up to 350° C.,
• B) dissolving the solid prepolymer obtained in accordance with step A) in an organic phosphonic anhydrides with formation of a solution and/or dispersion,
• C) heating the solution obtainable in accordance with step B) under inert gas to temperatures of up to 300° C. with formation of the dissolved polyazole polymer,
• D) forming a layer using the solution of the polyazole polymer in accordance with step C) on an electrode and
• E) treating the layer formed in step D).

A process to produce a proton-conducting polymer membrane which comprises the steps of

• A) reacting one or more aromatic tetramino compounds with one or more aromatic carboxylic acids or their esters which contain at least two acid groups per carboxylic acid monomer, or one or more aromatic and/or heteroaromatic diaminocarboxylic acids in the melt at temperatures of up to 350° C.,
• B) dissolving the solid prepolymer obtained in accordance with step A) in an organic phosphonic anhydrides with formation of a solution and/or dispersion,
• C) heating the solution obtainable in accordance with step B) under inert gas to temperatures of up to 300° C. with formation of the dissolved polyazole polymer,
• D) forming a membrane using the solution of the polyazole polymer in accordance with step C) on a support and
• E) treating the membrane formed in step D) until it is self-supporting.