| 초록 |
In order to obtain monodisperse microspheres for industrial use, semi - batch "emulsifier-free" emulsion copolymerization of styrene and butyl acrylate in the presence of a ionic comonomer [acrylic acid (AA)] and nonionic comonomer [hydroxyethyl methacrylate (HEMA)] was carried out using potassium persulfate or ammonium persulfate as an initiator. Relative contents of styrene, butyl acrylate, AA and HEMA used in the preparation of latexes were so adjusted that the stable core-chell latex particle was obtained. The effects of reaction temperature, agitation rate, comonomer content, and initiator content on the conversion were investigated. The morphology of the core-shell latex size and size distribution of the latex particles were observed by transmission electron microscopy(TEM) and light scattering(LS). Glass-transition temperature(Tg) of latex particle formed was also measured using differential scanning calorimetry(DSC).
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