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6655660 
Journal Article 
Suspension polymerization with hydrophobic silica as a stabilizer II. Preparation of polystyrene composite particles containing carbon black 
Park, M; , 
2006 
1 
Polymer - Korea
ISSN: 0379-153X 
POLYMER SOC KOREA 
SEOUL 
30 
6 
505-511 
Korean 
WOS:000242782700008 
We tried to prepare polystyrene composite particles containing carbon black by suspension polymerization with water as a reaction medium. Hydrophobic silica was selected as a stabilizer and oil-soluble azobisisobutyronitrile (AIBN), as an initiator. All polymerization reactions were carried out at a fixed temperature of 75 degrees C. Stabilizer concentration was varied from 0.17-3.33 wt% compared to water, where particles with 7.96 mu m in average diameter were obtained at 1.67 wt% of stabilizer. Increase in divinylbenzene concentration, as a crosslinking agent. from 0.1 similar to 1.0 wt% compared to monomer exhibited a large increase in average particle diameter. Incorporation of 1 wt% of carbon black compared to monomer produced an increase in average diameter. It is speculated that viscosity lower than that necessary to induce even dispersion of carbon black particles led to poor dispersion, and as a result, large particles. For a styrene mixture containing 3 wt% carbon black compared to monomer, enhanced dispersion due to an increase in carbon black concentration reduced average particle diameters. For styrene mixtures containing 1 and 3 wt% carbon black compared to monomer, preparticles before polymerization and polymer composite particles after polymerization showed a similar tendency towards particle formation. When carbon black concentration compared to monomer was increased to 5 and 7 wt%, styrene mixtures exhibited a large increase in viscosity. and thus better dispersion of carbon black particles, which led to a decrease in preparticle diameters. However. these particles experienced agglomeration in the polymerization process, and polystyrene composite particles increased in average diameter. 
Agglomeration; Carbon black; Dispersion; Hydrophobic silica; Polystyrene composite particles; Suspension polymerization