Preparation of solvent-resistant anion-exchange membranes

Solvent-resistant anion-exchange membranes with a crosslinking matrix were prepared with the reaction of chloromethylated polysulfone in N, N-dimethyl formamide with diamine, such as N, N-dimethyl-1,3-propanediamine, or N, N, N', N'-tetramethyl-1, 6-hexanediamine. The electrical resistances of the me mbrane were 1.28-12.5 Omega. The permselectivities were in the range of 93. 1-98.5%. The solvent-resistant performances of the anion membrane were veri fied by making a bipolar membrane. It is shown that the bipolar membrane ca n operate at a higher current density because the crosslinked matrix of the anion membrane limited the degree of interpenetration from the sulfonated polysulfone solution in DMF on it to the extent necessary to produce qualit y bipolar membranes.