Janus particles by simplified RAFT-based emulsion polymerization process for polymer coating

Abstract We describe a simplified method to synthesize film forming polymer Janus particles by phase separation during RAFT-based free radical emulsion polymerization. Fully crosslinked snowman- or football-shaped polystyrene (PSJPs) were first produced in one-step batch process using amphiphilic triblock macro-RAFT copolymers as stabilizers. Such turn employed seeds continuous polymerization which monomer mixture of methyl methacrylate (MMA) and butyl acrylate (BA) (1/1 weight) was constantly injected into the reaction presence water soluble initiator. The added monomers wetted seed particle surface their led formations 93-nm single- two-headed particles. resulted latex successfully used disperse encapsulate solid calcite extender. Graphical abstract