Synthesis of soap-free emulsion of vinyl acetate and butyl acrylate in the presence of AMPS

Without adding any conventional emulsifier,using 2-acrylamido-2-methylpropane sulfonic acid(AMPS) as the surfactant monomer(surfmer),a new type of P(VAc/BA/AMPS) terpolymer soap-free emulsion is successfully prepared.The emulsion system had desirable stability cluring the polymerization process and its storage of six months.This article examined the influence of ratio of monomers,AMPS dosage,initiator dosage and reaction temperature on the properties of the terpolymer emulsion.The obtained optimum condition is as follows:mVAc:mBA =8:2,AMPS 1.5% of monomer amount,initiator potassium persulfate(KPS) 0.6% of monomer amount and the reaction temperature is 80 ℃.The average particle size(D) of prepared emulsion is around 144 nm with good monodispersity.The solid content is as high as 40%.