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Preparation of hemispherical polymer particles via phase separation induced by microsuspension polymerization

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Abstract

Micrometer-sized, hemispherical polystyrene (PS) particles were successfully prepared by microsuspension polymerization of homogeneous styrene/hexadecane (HD) droplets dispersed in polyoxyethylene nonylphenyl ether (Emulgen 931) aqueous solution, followed by rapid removal of HD from formed PS/HD particles with a “Janus” structure. It was important for the formation of the morphology of Janus particles in thermodynamically stable state to carry out the polymerization slowly. The formation of by-product small PS particles by emulsion polymerization was suppressed by the additions of CuCl2 as a water-soluble inhibitor and NaCl to decrease the solubility of styrene in the aqueous phase.

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Acknowledgments

This work was supported by Grant-in-Aid for Scientific Research (A) (grant 21245050) from the Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe, 657-8501, Japan

    Tomoe Yamagami, Takuya Tanaka, Toyoko Suzuki & Masayoshi Okubo

  2. Smart Spheres Workshop Co., Ltd., 2-1-214-122, Koyo, Naka, Higashi-Nada, Kobe, 658-0032, Japan

    Masayoshi Okubo

Authors
  1. Tomoe Yamagami
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  2. Takuya Tanaka
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  3. Toyoko Suzuki
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  4. Masayoshi Okubo
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Corresponding author

Correspondence to Masayoshi Okubo.

Additional information

This paper was part CCCLI of the series “Studies on Suspension and Emulsion.”

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Yamagami, T., Tanaka, T., Suzuki, T. et al. Preparation of hemispherical polymer particles via phase separation induced by microsuspension polymerization. Colloid Polym Sci 291, 71–76 (2013). https://doi.org/10.1007/s00396-012-2625-y

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  • DOI: https://doi.org/10.1007/s00396-012-2625-y

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