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The aim of the experiment is to eliminate the unnecessary microparticles in the liquid through the water membrane.The development of clean water production depends on membrane technology,although membrane fouling significantly restricts the performance of current membranes.The present study is based on experiments to eliminate the unnecessary microparticles in water through membranes.Membranes that deliver nanoscale size selectivity are desirable for applications ranging from water treatment to molecular separations [1].The particle removal of polymer water treatment membranes will be characterized in the size range of 0.1–0.5μm using monodisperse polystyrene microspheres.During the process of emulsion polymerization,colloidal stability is a factor that we have to consider.For dry or isolated products,the polymer dispersion must be isolated,or converted into solid form.This can be accomplished by simple heating of the dispersion until all water evaporates.More commonly,the dispersion is destabilized (sometimes called "broken") by addition of a multivalent cation.Alternatively,acidification will destabilize dispersion with a carboxylic acid surfactant.The experiment will test the transmission of water membrane by using the microparticles made from the process of emulsion polymerization [2].In the present study,the monodisperse polystyrene (PS) will be synthesized by emulsion polymerizing styrene monomers in an aqueous solution containing a surfactant of cetyltrimethyl ammonium bromide (CTAB) and sodium dodecyl sulfate (SLS) and an initiator of 2,2′-azobis(isobutyramidine) dihydrochlorid (AIBA) and potassium persulfate (KPS).SEM,DSC,FT-IR,and zeta-potential will be used to characterize the resulting latexes and latex copolymers.