Journal
COLLOID AND POLYMER SCIENCE
Volume 290, Issue 11, Pages 1023-1031Publisher
SPRINGER
DOI: 10.1007/s00396-012-2618-x
Keywords
Soap-free emulsion polymerization; Micron-sized particle; Oil-soluble initiator; Electrolyte; Coagulation
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Funding
- Ministry of Education, Culture, Sports, Science and Technology of Japan [23760721]
- Grants-in-Aid for Scientific Research [23760721] Funding Source: KAKEN
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Soap-free emulsion polymerization of styrene using oil-soluble initiators and electrolytes was investigated to synthesize micron-sized polystyrene particles. It was clear that an oil-soluble initiator, such as AIBN, worked like a water-soluble initiator in soap-free emulsion polymerization of styrene to prepare monodispersed particles with negative charges, probably because of the polarization of the electron-attractive functional groups decomposed from the initiators and the pi electron cloud of benzene in a styrene monomer. The addition of an electrolyte enabled secondary particles to effectively promote hetero-coagulation for particle growth by reduction of an electrical double layer and prevention of self-growth. Changing the concentration and type of electrolyte enabled us to control the size up to 12 mu m in soap-free emulsion polymerization of styrene using AIBN. Conventionally, organic solvents and surfactants have been used to prepare micron-sized polymeric particles, but this method enabled the synthesis of micron-sized polymeric particles in water using electrolytes without surfactants.
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