Preparation and characterization of sulfonated polyethersulfone membranes by a facile approach

► An ease method for fabricate sulfonated polyethersulfone (SPES) was provided. ► The side reactions and degradation reactions could be avoidable in this approach. ► The obtained SPES could be directly blended with PES in a large range of ratios. ► The anticoagulant activity of the membranes was significantly improved. ► The method employed in this study can be used to modify other polymeric membranes.