화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Macromolecular Research, Vol.11, No.6, 418-424, December, 2003
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Poly(methyl methacrylate-co-styrene)/Silicate Nanocomposites Synthesized by Multistep Emulsion Polymerization
Yeong Suk Choi, Yoon Kyung Kim, and In Jae Chung†
  • Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea
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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 1H NMR spectroscopy and TEM, respectively. P(MMA-co-ST) copolymers showed two molecular weight profiles and two glass transition temperatures (Tg) in GPC and DMA measurements. At 30 ℃, 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.
Keywords:poly(methyl methacrylate-co-styrene);core-shell structures;silicate;nanocomposite;emulsion polymerization.
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