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 ~(29)Si 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.