Polymer electrolyte membrane and process for its manufacture

摘要

In order to produce a polymer electrolyte membrane from sulphonated aromatic polyether ketone, an aromatic polyether ketone of the formula (I) where Ar is a phenylene ring having p- and/or m-bonds, Ar' is a phenylene, naphthylene, biphenylene, anthrylene or another divalent aromatic unit, X, N and M, independently of one another, are 0 or 1, Y is 0, 1, 2 or 3, P is 1, 2, 3 or 4, is sulphonated, and the sulphonic acid is isolated. At least 5 % of the sulphonyl groups in the sulphonic acid are converted into sulphonyl chloride groups, and these are reacted with an amine which has at least one crosslinkable substituent or a further functional group, and unreacted sulphonyl chloride groups are subsequently hydrolysed. The resultant aromatic sulphonamide is isolated and dissolved in an organic solvent, the solution is converted into a film, and the crosslinkable substituents present in the film are then crosslinked. In specific cases, the crosslinkable substituents can be omitted. In this case, sulphonated polyether ketone is converted into a film from solution.