Production of Core-shell Particles by Combined Semibatch Emulsion/Suspension Polymerizations

摘要

Core-shell polymer particles were produced by combined semibatch emulsion/suspension polymerizations, using different monomers. It is shown that the morphology of the shell depends on the glass transition temperature (T_g) of the emulsified particles and that specificareas can vary considerably (7.9 to 37 m~2 ? g~(-1) ), depending on reaction conditions and used monomers. Particularly, a thin film is formed around the core when the T_g of the polymer that constitutes the shell is lower than the reaction temperature, while a porous shell is formed when the T_g of the polymer material is higher than the reaction temperature. Based on the observed data, a physical model was proposed to explain the formation of core-shell particles by combination of typical suspension and emulsion polymerization recipes.