Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Poly(methyl methacrylate-co-styrene)/Silicate Nanocomposites Synthesized by Multistep Emulsion Polymerization

  • Park, Yeong-Suk (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology) ;
  • Kim, Yoon-Kyung (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology) ;
  • Chung, In-Jae (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology)
  • Published : 2003.12.01
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Abstract

Exfoliated poly(methyl methacrylate-co-styrene) [P(MMA-co-ST)]/silicate nanocomposites were synthesized through a multistep emulsion polymerization. The methyl methacrylate monomers were polymerized first and then the styrene monomers were polymerized. The nanocomposites had core-shell structures consisting of PMMA (core) and PS (shell); these structures were confirmed by $^1$H NMR spectroscopy and TEM, respectively. P(MMA-co-ST) copolymers showed two molecular weight profiles and two glass transition temperatures (T$_{g}$) in GPC and DMA measurements. At 30 $^{\circ}C$, the nanocomposites exhibited 83 and 91 % increases in their storage moduli relative to the neat copolymer because the silicate layers were dispersed uniformly in the polymer matrix.x.

Keywords

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