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Size control of polystyrene nodules formed on silica particles in soap-free emulsion polymerization with amphoteric initiator

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Abstract

An amphoteric initiator of 2,2′-azobis[N-(2-carboxyethyl)-2-2-methylpropionamidine] (VA-057) was applied to fabrication of raspberry-shaped composite particles in soap-free emulsion polymerization of styrene in the presence of silica particles surface-modified with 3-methacryoxypropyltrimethoxysilane. In the polymerizations, pH of the solution was ranged from 7.9 to 9.9 to alter dissociation degree of ionizable groups in the initiator. Raspberry-shaped particles were obtained in a pH range of 8.0 to 9.3 followed by a tendency in which average size of polystyrene (PSt) nodules adsorbed onto the silica particles decreased with pH. This tendency was similar to that of polymer particles formed in conventional soap-free emulsion polymerization in the absence of the silica particles. An increase in silica particle concentration led to a decrease in the final size in PSt nodules. The decrease was caused by the stabilization of polymer particles fixed to the silica surface against polymer particle aggregation in water phase.

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Acknowledgement

This research was partially supported by a Grant-in-Aid for Science Research (no. 20681011 and no. 20360354).

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Authors and Affiliations

  1. Department of Chemical Engineering, Graduate School of Engineering, Tohoku University, 6-6-07 Aoba, Aramaki-aza, Aoba-ku, Sendai, 980-8579, Japan

    Daisuke Nagao, Takuya Ueno, Daisuke Oda & Mikio Konno

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  1. Daisuke Nagao
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  2. Takuya Ueno
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  3. Daisuke Oda
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  4. Mikio Konno
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Correspondence to Mikio Konno.

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Nagao, D., Ueno, T., Oda, D. et al. Size control of polystyrene nodules formed on silica particles in soap-free emulsion polymerization with amphoteric initiator. Colloid Polym Sci 287, 1051–1056 (2009). https://doi.org/10.1007/s00396-009-2063-7

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  • DOI: https://doi.org/10.1007/s00396-009-2063-7

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