Intercalation of (3-Aminopropyl) triethoxysilane and (3-Aminopropyl) diethoxymethylsilane into Montmorillonite(Characterization of Clays,Proceedings of the 13^<th> International Clay Conference)

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We studied the intercalation of (3-aminopropyl) triethoxysilane (APTEOS) and (3-aminopropyl) diethoxymethylsilane (APDEOS) into Na-montmorillonite interlayers by using XRD, NMR, and FT-IR. It was suggested that APTEOS is not intercalated in the interlayers of montmorillonite as "random" polymerized structures, but as "cage" structures of "Siloxane Cubic Octamer" (SCO). To clarify the structures of organosilicate materials in the interlayers, we compared the intercalated compounds derived from APTEOS with those from pre-synthesized SCO. ^<29>Si NMR spectra of both intercalation compounds were very similar and mainly showed the peak at -68 ppm of the Si Q^3 structure due to the SCO. The basal spacing of both intercalated compounds had similar values and changed with the amount of APTEOS. The changed basal spacing was explained by the direction of aminopropyl chains in the interlayers. These results supported the SCO structure model in the interlayers. We also investigated Brunauer-Emmet-Teller (BET) adsorption properties of intercalated compounds. Changes of pore radius and surface area were well explained by the SCO model. In the case of APDEOS intercalation, polymer structures of poly (dimethylsiloxane) were intercalated as indicated by the peak at -22 ppm of ^<29>Si NMR. The intercalation behavior of APDEOS was different from that of APTEOS.
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