Influence of viscosity within polymerizing particle on the morphology of micron-sized,monodisperse composite polymer particles produced by seeded polymerization for the dispersion of highly monomer-swollen polymer particles

摘要

Micron-sized,monodisperse polystyrene (PS)/poly(n-butyl methylacrylate) (PBMA) composite particles,in which PS domain(s) were dispersed in a PBMA continuous phase,were produced by seeded polymerization for the dispersion of highly n-butyl methacrylate (BMA)-swollen PS particles (PS/BMA=1/150,w/w) using various concentrations of benzoyl peroxide as initiator in the absence/presence of sodium nitrite (NaNO_2) as a water-soluble inhibitor.The percentages of the composite particles having double,triple and over PS domains,which were thermodynamically unstable morphologies,increased with a rapid increase of viscosity within the polymerizing particle.