Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Synthesis and Properties of Exfoliated Poly(methyl methacrylate-co-acrylonitrile)/Clay Nanocomposites via Emulsion Polymerization

  • Mingzhe Xu (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Park, Yeong-Suk (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Wang, Ki-Hyun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Kim, Jong-Hyun (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology(KAIST)) ;
  • Chung, In-Jae (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology(KAIST))
  • Published : 2003.12.01
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Abstract

Poly(methyl methacrylate-co-acrylonitrile) [P(MMA-co-AN)]/Na-MMT nanocomposites were synthesized through emulsion polymerization with pristine Na-MMT. The nanocomposites were exfoliated up to 20 wt% content of pristine Na-MMT relative to the amount of MMA and AN, and exhibited enhanced storage moduli, E', relative to the neat copolymer. The exfoliated morphology of the nanocomposite was confirmed by XRD and TEM. 2-Acryla-mido-2-methyl-1-propane sulfonic acid (AMPS) widened the galleries between the clay layers before polymerization and facilitated the comonomers, penetration into the clay to create the exfoliated nanocomposites. The onset of the thermal decomposition of the nanocomposites shifted to a higher temperature as the clay content increased. By calculating areas of tan$\delta$ of the nanocomposites, we observed that the nanocomposites show more solid-like behavior as the clay content increases. The dynamic storage modulus and complex viscosity increased with clay content. The complex viscosity showed shear-thinning behavior as the clay content increased. The Young's moduli of the nano-composites are higher than that of the neat copolymer and they increase steadily as the silicate content increases, as a result of the exfoliated structure at high clay content.

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