Abstract
This work concerned synthesis and characterization of an organic water-based coating based on poly (methyl methacrylate-co-butyl acrylate-co-acrylic acid) through seeded semi-batch emulsion polymerization. Silica nanoparticles were added in situ under controlled pH and temperature conditions at different mass concentrations, and consequent influences on various properties of obtained films were explored. It was observed that prepared latexes were stable for months. Also, monomer conversion was enhanced upon nanosilica addition, where coagulum level remained low (less than 0.1 wt%). Latex particle size analysis showed a bimodal type of distribution due to the dual effects of the nanosilica particles presence. Optical clarity of cast films from synthesized latexes was found desirable implying uniform distribution and dispersion of nanosilica moieties. The addition of nanosilica to formulation was found to affect the final conversion of monomer and entanglement density resulting in lower storage modulus and enhanced damping. An increase in surface hardness was seen after increasing nanosilica concentration. Silica nanoparticles were found to be positively influential on acrylic coating properties investigated.
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