Polyaromatic ether‐ketone sulfonamides prepared from polydiphenyl ether‐ketones by chlorosulfonation and treatment with secondary amines

Polyaromatic ether‐ketone sulfonamides with potentially open structures of interest for membranes were prepared from polyaromatic ether‐ketones by sulfonation with chlorosulfonic acid, followed by amination with various amines. Various degrees of substitution were achieved by controlling the reaction conditions of sulfonation. These polymers are soluble in solvents like dimethylformamide, dimethylacetamide, and chloroform and can be cast into transparent films.