Macromolecular Research

, Volume 15, Issue 5, pp 403–411 | Cite as

Electrolyte effect on the particle characteristics prepared by soap-free emulsion polymerization

  • Seungtak Han
  • Kangseok Lee
  • Sang Eun Shim
  • Prakash J. Saikia
  • Soonja Choe
  • Inwoo Cheong


Monodisperse micron-sized polystyrene (PS) spheres were successfully obtained using a single stage soap-free emulsion method in aqueous media mixed with ethanol (co-solvent) containing NaCl as the electrolyte. The optimum conditions for preparing the monodisperse PS microspheres, using soap-free emulsion polymerization in a water/ethanol mixture with an electrolyte, were studied. The presence of the co-solvent and electrolyte controlled the particle dispersion stability during the polymerization. The microspheres formed using PS, with a weightaverage diameter of 2.6 εm, coefficient of variation of 5.3% and zeta potential of −15.1 eV, were successfully obtained in the presence of 0.1 wt% NaCl, 10 wt% monomer, 0.1 wt% initiator and 95/5 (g/g) of a water/ethanol mixture reacted at 70°C for 24 h.


soap-free emulsion polymerization styrene, electrolyte 


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Copyright information

© The Polymer Society of Korea and Springer 2007

Authors and Affiliations

  • Seungtak Han
    • 1
  • Kangseok Lee
    • 1
  • Sang Eun Shim
    • 1
  • Prakash J. Saikia
    • 1
  • Soonja Choe
    • 1
  • Inwoo Cheong
    • 2
  1. 1.Department of Chemical EngineeringInha UniversityIncheonKorea
  2. 2.Department of Applied ChemistryKyungpook National UniversityDaeguKorea

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