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 <TEX>$^29Si$</TEX> CP MAS NMR of the silylated samples showed <TEX>$Q^2\;and\;Q^3$</TEX> signals as well as <TEX>$T^2\;and\;T^3$</TEX> signals. The increase in the relative intensity of <TEX>$Q^3\;for\;Q^2$</TEX> and the appearance of <TEX>$T^2\;and\;T^3$</TEX> signals was attributed to the grafting of 3-aminopropyltriethoxysilane to the interlayer surface silanol groups.
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