Synthesis of amphiphilic tri-block copolymerpoly（vinylpyrrolidone）-b-poly（methyl methacrylate）-b-poly（vinylpyrrolidone） for the modification of polyethersulfone membrane

Well-defined amphiphilic tri-block copolymer PVP-b-PMMA-b-PVP was prepared for the first time via successive reversible addition fragmentation chain transfer（RAFT） polymerization using carboxyl-terminated trithiocarbonate as the RAFT agent.The structure of the copolymer was characterized using FTIR,GPC and ~1H NMR.The block copolymer could be directly blended with polyethersulfone（PES） as a macromolecule additive using N-methyl-2-pyrrolidone（NMP） as the solvent to prepare membranes. The water contact angles for the modified membranes decreased obviously,and therefore,the protein adsorption amount on the membrane surface decreased.