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Influence of the nature of organic groups on the properties of organically modified silica aerogels

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Abstract

Organically modified aerogels were prepared by NH4OH-catalyzed hydrolysis and condensation of RSi(OMe)3 (R = Me, Prn, Ph, Bui)/Si(OMe)4 or (MeO)3Si-Y-Si(OMe)3/Si(OMe)4 (Y = C2H4, p-C6H4, C6H12) mixtures, followed by supercritical drying of the alcogels with methanol. Starting from 1:4 mixtures of RSi(OMe)3 and Si(OMe)4, hydrophobic aerogels with nearly no residual Si-OH or Si-OMe groups were obtained. These aerogels were therefore insensitive towards moisture. Their elastic constant was distinctly lower than that of unmodified silica aerogels. Aerogels similarly prepared from 1:8 mixtures of (MeO)3Si-Y-Si(OMe)3 and Si(OMe)4 had a rather high concentration of residual Si-OMe groups, and therefore they were hydrophilic. Their elasticity was about the same as that of unmodified silica aerogels. The difference between the two types of aerogels suggests different microstructures, depending on the nature of the organic groups.

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Authors and Affiliations

  1. Institut für Anorganische Chemie der Universität Würzburg, Am Hubland, D-97074, Würzburg, Germany

    Fritz Schwertfeger, Nicola Hüsing & Ulrich Schubert

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  1. Fritz Schwertfeger
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  2. Nicola Hüsing
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  3. Ulrich Schubert
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Schwertfeger, F., Hüsing, N. & Schubert, U. Influence of the nature of organic groups on the properties of organically modified silica aerogels. J Sol-Gel Sci Technol 2, 103–108 (1994). https://doi.org/10.1007/BF00486221

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  • DOI: https://doi.org/10.1007/BF00486221

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