Batch emulsion copolymerization of n-butyl acrylate and methyl methacrylate in the presence of a nonionic surfactant

Batch emulsion copolymerization studies of n-butyl acrylate and methyl methacrylate have been investigated using potassium persulfate as initiator and a nonionic surfactant (REWOPAL HV 25) as emulsifier. Higher polymerization rates, shorter nucleation stage and complete conversion are obtained by comparison to the SDS-emulsified copolymerization. The kinetic and particle number data support a micellar-type mechanism for the formation of copolymer particles. Strong affinity between the two monomers and the nonionic surfactant results in significantly high solubilization of the surfactant in the initial monomer phase and its subsequent burial inside the final latex particles.