MEMBRANE-ELECTRODE ASSEMBLIES AND LONG-LIFE FUEL CELLS

摘要

Polymer with high molecular weight which can be obtained by a method, in which a composition is polymerised by free-radical polymerisation which, based on its total weight, comprises at least 80.0% by weight of ethylenically unsaturated compounds, characterized in that the composition contains at least one monomer comprising phosphonic acid groups and/or sulphonic acid groups. The polymer has a weight average of the degree of polymerisation of more than 300 and due to its chemical and physical properties, is particularly suitable for polymer electrolyte membranes (PEM) in so-called PEM fuel cells.