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Abstract

A membrane obtainable by

A) mixing: (vii) aromatic tetraamino compounds and(viii) aromatic carboxylic acids or esters thereof which contain at least two acid groups per carboxylic acid monomer,or(ix) aromatic and/or heteroaromatic diaminocarboxylic acids, in polyphosphoric acid to form a solution and/or dispersion B) heating the mixture from step A), and polymerizing until an intrinsic viscosity of at least 0.8 dl/g, is obtained for the polymer being formed,C) adding polyazole polymers,D) heating the mixture from step C),E) applying a membrane layer using the mixture according to step D) on a carrier or an electrode,F) treating the membrane formed in the presence of water and/or moisture,G) removing the membrane from the carrier;wherein the content of all polyazole polymers in the membrane is between 5% to 25% by weight and wherein the membrane has a Young Modulus is at least 2.0 MPa.

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First Claim