Incorporation of PMMA and PS in Styrene and Methyl methacrylate Miniemulsion Homopolymerization



In this work, the effect of adding different polymer types, such as polystyrene (PS) and poly(methyl methacrylate) (PMMA), with different molecular weight and variable concentrations on the kinetics and the nucleation mechanisms of styrene and methyl methacrylate miniemulsion homopolymerizations was evaluated. Results showed that higher amounts of predissolved polymer increases the fraction of blend (PMMA and PS) particles formed, indicating that it favors the mechanism of droplet nucleation. However, there is a limit to the incorporation of predissolved polymers as very high viscosities of the organic phase lead to poor dispersion of monomer droplets. It was also noted that other nucleation mechanisms besides monomer droplets nucleation were less important in the miniemulsion homopolymerization of methyl methacrylate than in the styrene homopolymerization.