Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Interlamellar Silylation of Montmorillonite with 3-Aminopropyltriethoxysilane

  • Park, Kyeong-Won (Department of Chemistry, Gyeongsang National University) ;
  • Kwon, Oh-Yun (Department of Chemical Engineering, Yosu National University)
  • Published : 2004.07.20
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Abstract

H-montmorillonite was modified by interlayer surface silylation using 3-aminopropyltriethoxysilane and dodecylamine in ethanol without a pre-swelling step. Dodecylamine acts as a gallery expander and silylation catalyst. The evaporation of ethanol from the dispersion yields well-ordered silylated montmorillonites with large basal spacing between 1.50 and 4.20 nm. Solid-state $^29Si$ CP MAS NMR of the silylated samples showed $Q^2\;and\;Q^3$ signals as well as $T^2\;and\;T^3$ signals. The increase in the relative intensity of $Q^3\;for\;Q^2$ and the appearance of $T^2\;and\;T^3$ signals was attributed to the grafting of 3-aminopropyltriethoxysilane to the interlayer surface silanol groups.

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