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Controlling the size and surface morphology of carboxylated polystyrene latex particles by ammonium hydroxide in emulsifier-free polymerization

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Abstract

In emulsifier-free, emulsion polymerization with ionizable comonomer, the ionization of the comonomer is critical in determining the size of the final polymeric particles at sub-micrometer scale. In this study, polystyrene latex beads with carboxylates on the surface were synthesized using acrylic acid as a comonomer. Specifically, ammonium hydroxide was added to the emulsifier-free polymerization system to promote the ionization of acrylic acid by increasing pH. Smaller polystyrene latex particles were produced by increasing the ammonium hydroxide concentration in the reaction system, due to the enhanced stability promoted by the ionization of acrylic acid during the nucleation step. In addition, the surface morphology of the polystyrene latex particles was controlled by the concentration of acrylic acid, the dissociation of which was influenced by the ammonium hydroxide concentration.

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Authors and Affiliations

  1. Department of Chemical and Biomolecular Engineering, Yonsei University, 120-749, Seoul, Korea

    Hyunbae Dong & Sang-Yup Lee

  2. Korea Basic Science Institute, 136-713, Seoul, Korea

    Gi-Ra Yi

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  1. Hyunbae Dong
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  2. Sang-Yup Lee
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  3. Gi-Ra Yi
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Correspondence to Sang-Yup Lee.

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Dong, H., Lee, SY. & Yi, GR. Controlling the size and surface morphology of carboxylated polystyrene latex particles by ammonium hydroxide in emulsifier-free polymerization. Macromol. Res. 17, 397–402 (2009). https://doi.org/10.1007/BF03218880

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  • DOI: https://doi.org/10.1007/BF03218880

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