To improve the antifouling ability of polypropylene microporous membrane(PPMM)

a facile surface modification approach was developed based on the assembly of negatively charged biomacromolecules.The PPMM surface was first endowed with a permanently positively charged coating layer by combining a pretreatment using dielectric barrier discharge plasma under atmospheric pressure with interfacial crosslinking.Then polyelectrolyte bearing negative charges was immobilized on the surface by dynamic electrostatic selfassembly.The surface chemical composition and morphology of the modified membranes were confirmed by ATRFTIR

XPS

and FESEM.Static water contact angle and pure water flux measurements were also conducted.It was found that surface hydrophilicity of the negatively charged membrane was greatly enhanced and water flux increased remarkably.When assemble density reached 53.0 μg·cm-2

water flux was （2445±95） L·（m2·h）-1

which was 2.9 times as high as that of the unmodified membrane.Furthermore

protein solution filtration suggested strong resistance of these negatively charged membranes to the adsorption of negatively charged proteins.