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A suspension copolymerization of styrene and butyl methacrylate (BMA) in the aqueous phase was conductedat a selected temperature between 65 and 95℃. Hydrophobic silica was selected as a stabilizer and azobisisobutyronitrile(AIBN) as an initiator. Optimum dispersion of silica in water was obtained at pH 10 while polymerization reaction wasrun at pH 7. TGA and EDS measurements revealed that 90% of silica functioned as a stabilizer and 10% were incorporatedinto polymeric particles. Average particle diameter decreased with increasing amounts of stabilizer. Molecular weights displayedan increase when the stabilizer concentration reached 1.67 wt%. An increase in the initiator concentration and/or reaction temperature raised the reaction rate but decreased molecular weights. Particle diameter was nearly independent of the initiatorconcentration and reaction temperature. An increase in the BMA proportion decreased the glass transition temperature andincreased the particle diameter with irregularity in shape. Incorporation of carbon black into the particles composed ofstyrene and BMA prolonged the reaction time before reaching completion. We have confirmed that a suspension copolymeriza-tion of styrene and BMA with hydrophobic silica as a stabilizer can produce spherical composite particles with 1-30 ㎛ in diameter containing carbon black.(BMA)   65℃ 95℃    .   , azobisisobutyronirile (AIBN)  .   pH 10   pH 7 . TGA  EDS90%  10%..    1.67 wt%  .   /.. BM A.   /BMA.1-30 ㎛  (-BMA).

elastomers and composites

Preparation of Copoly(styrene/butyl methacrylate) Beads and Composite Particles containing Carbon Black with Hydrophobic Silica as a Stabilizer in Aqueous Solution