Interlamellar Silylation of Montmorillonite with 3-Aminopropyltriethoxysilane

摘要

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 Q2 and Q3 signals as well as T2 and T3 signals. The increase in the relative intensity of Q3 for Q2 and the appearance of T2 and T3 signals was attributed to the grafting of 3-aminopropyltriethoxysilane to the interlayer surface silanol groups.