FILMS OF FLUORINATED POLYMER CONTAINING SULFONYL GROUPS WITH ONE SURFACE IN THE SULFONAMIDE OR SULFONAMIDE SALT FORM AND A PROCESS FOR PREPARING SUCH

摘要

A film useful as an ion exchange membrane of fluorinated polymer containing pendant side chains containing sulfonyl groups which are attached to carbon atoms which have at least one fluorine atom attached thereto; one surface of the film having a majority of the sulfonyl groups of the polymer in the -(SO2NH)mQ form wherein Q is H, NH4, cation of an alkali metal and/or cation of alkaline earth metal and m is the valence of Q and the other surface of the film having the sulfonyl groups in the -(SO3)nMe form wherein Me is a cation and n is the valence of the cation and processes for preparing the film.