AbstractEmulsifier‐free emulsion polymerization of styrene in acetone–water medium was carried out using potassium persulfate as initiator. Below acetone content of 40 vol , stable emulsion was prepared and polymerizations were remarkably fast compared with those in pure water. The particle size decreased from 0.5 to 0.17 μm with an increase in acetone content in the range 0–40 vol , and the distributions were very sharp. The optimum polymerization for the preparation of the stable emulsion was: styrene, 20 vol ; acetone/water, 40/60 (v/v); KPS, 3.4 × 10−3mole/l; te
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