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The Structure of Hybrid Gels by Drift and NMR Spectroscopies

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Abstract

Hybrid inorganic-organic gels have been prepared by the sol-gel process using tetraethoxysilane (TEOS) as precursor, mixed with a low concentration of polytetrahydrofuran (PTHF), under acid catalysis. The hybrid xerogels were characterized by DRIFTS and Solid State 1H, 13C and 29Si NMR. The DRIFT spectra indicate that the polymer is responsible for decreasing the number of free silanol groups in comparison to pure silica. Solid-state NMR spectra reveal the types of silicate structures formed and the conditions for establishing chemical bonds between the two phases, which are responsible for the silica network flexibility. We have concluded that it is possible to design a hybrid gel with tailored properties, even at very low polymer concentration, by selecting the appropriate preparation route.

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Authors and Affiliations

  1. Centro de Química-Física Molecular, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisboa, Portugal

    Alexandra Fidalgo

  2. Instituto de Ciência e Engenharia de Materiais e Superfícies, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisboa, Portugal

    Teresa G. Nunes

  3. Centro de Química-Física Molecular, Complexo I, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001, Lisboa, Portugal

    Laura M. Ilharco

Authors
  1. Alexandra Fidalgo
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  2. Teresa G. Nunes
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  3. Laura M. Ilharco
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Fidalgo, A., Nunes, T.G. & Ilharco, L.M. The Structure of Hybrid Gels by Drift and NMR Spectroscopies. Journal of Sol-Gel Science and Technology 19, 403–407 (2000). https://doi.org/10.1023/A:1008783010298

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  • DOI: https://doi.org/10.1023/A:1008783010298

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