PROTON-CONDUCTING POLYMER MEMBRANE COMPRISING PHOSPHONIC ACID GROUPS CONTAINING POLYAZOLES AND THE USE THEREOF IN FUEL CELLS

摘要

The invention relates to proton-conducting polymer membranes comprising phosphonic acid groups containing polyazoles, which can be obtained accordin g to a method comprising the following steps: A) one or several aromatic and/o r heteroaromatic tetra amino compounds are mixed with one or several several aromatic and/or heteroaromatic carboxylic acids or the derivatives thereof containing at least two acidic groups per carboxylic monomer, wherein at lea st one part of the tetra amino compounds and/or carboxylic acids comprises at least one phosphonic acid group, or one or several aromatic and/or heteroaromatic diaminocarboxylic acids, of which at least one part comprises phosphonic acid groups, are mixed in polyphosphonic acid to form a solution and/or dispersion, B) the solution and/or dispersion obtained according to step A is heated in an inert gas to temperatures of up to 350 ~C to form polyazole polymers, C) a layer is applied to a carrier, using the mixture according to step A and/or B, the membrane formed in step C is treated until it becomes self-supporting.