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Effect of the clay size on the dispersion morphology and emulsion stability of ABS/layered silicate nanocomposites

Authors

  • Kwanghyon Kim,

    1. Department of Chemical and Biomolecular Engineering, KAIST (Korea Advanced Institute of Science and Technology), Yuseong-gu, Daejeon, South Korea
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  • Jong Hyun Kim,

    1. Department of Chemical and Biomolecular Engineering, KAIST (Korea Advanced Institute of Science and Technology), Yuseong-gu, Daejeon, South Korea
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  • In Jae Chung

    Corresponding author
    1. Department of Chemical and Biomolecular Engineering, KAIST (Korea Advanced Institute of Science and Technology), Yuseong-gu, Daejeon, South Korea
    • Department of Chemical and Biomolecular Engineering, KAIST (Korea Advanced Institute of Science and Technology), Yuseong-gu, Daejeon, South Korea
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Abstract

ABS/layered silicate nanocomposites were synthesized through an emulsion polymerization with different sizes of silicates. The particle sizes of Laponite, Cloisite-Na and Kunipia-F are about 20–30, 70–150, and 300–500 nm, respectively. When ABS was synthesized by the emulsion polymerization in the presence of Laponite and Cloisite-Na, ABS/layered silicate nanocomposite emulsion showed a stable suspension without the precipitation of solid particle. On the other hand, ABS/layered silicate nanocomposite synthesized with Kunipia-F showed the precipitation of large aggregated particles and the phase separation. Smaller sizes of silicates like Laponite and Cloisite-Na than polymerized particle worked as resided barrier preventing the emulsion particle from coagulation. Larger size of silicate like Kunipia-F than emulsion particle was not able to enclose the emulsion particle delicately because of its stiffness and large aspect ratio. The monomers inserted into the intercalated Kunipia-F connected the ABS particles and clay particles. The Kunipia-F particles anchored ABS particles around them inducing the aggregation and precipitation of ABS particles. ABS copolymer emulsion and aqueous silicate dispersion were mixed to compare with synthesized ABS/layered silicate nanocomposites and showed a stable suspension. With small amount of Laponite or Cloisite-Na, nanocomposite emulsion of Kunipia-F was also stabilized. Laponite and Cloisite-Na worked as a steric stabilizer. © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011

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