Emulsion polymerization of n-butyl acrylate and particle diameter control

Poly(n-butyl acrylate)(PnBA)latexs were prepared by one-step emulsion polymerization.The effect of monomer feed content,co-monomer composition(BA/St)and emulsifier type,on the resulting of particle size and surface tension was studied.It is found that,at high solids content,appropriate electrolyte's adding is great benefit to the forming of large particles,moreover,surface tension is decreased.In the copolymerization of n-butyl acrylate and styrene,particle size is decreased and surface tension is increased obviously even lead to demulsification with increasing St concentration.So the mechanism of obtain large particle size latexs was given under high solids content emulsion polymerization by the primary particles coalescence with electrolyte.