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Characterization of Organically Modified Silicates by 17O Solid State MAS and MQ-MAS NMR

  • V. Gualandris (a1), J. Maquet (a1), F. Babonneau (a1), P. Florian (a2) and D. Massiot (a2)...

Abstract

Organically modified silicates have been prepared, using methyltriethoxysilane and tetraethoxysilane in various molar ratios. The final network is thus composed of trifunctionnal T units and tetrafunctionnal Q units. Three types of oxo bridges can be formed through the competitive self-condensation or co-condensation reactions : (T)-O-(T), (Q)-O-(Q) and (T)-O-(Q). 17O-enriched water was used as reactant in order to selectively enrich the various oxo bridges, and to perform 17O solid state MAS-NMR. The combination of MAS experiments recorded at two different magnetic fields, and of the recently discovered MQ-MAS experiments allowed us to identify clearly the three types of oxo bridges. Quantitative analysis was extracted from the MAS-NMR spectra, and compared with calculations based on randomly distributed Si units.

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Characterization of Organically Modified Silicates by 17O Solid State MAS and MQ-MAS NMR

  • V. Gualandris (a1), J. Maquet (a1), F. Babonneau (a1), P. Florian (a2) and D. Massiot (a2)...

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