“…In order to avoid insoluble network formation, halomethylation can be performed with ZnC1 2 at low temperature or in dilute conditions with a small amount of catalyst. By reacting chloromethylated polysulfones with various nucleophilic groups, polysulfones were successfully functionalized with aldehyde, ester, amine, quaternary ammonium salts, azomethine groups, phosphonic groups, mercapto, azide groups, imidazolium groups, cinnamic groups, the poly(2‐gluconamidoethyl methacrylate) group and aspartic acid (Scheme ).…”