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Study on the influence of teos–diol molar ratio on their chemical interaction during the gelation process

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Abstract

Hybrid organic–inorganic materials, silica–diol, were synthesized by the sol–gel process from mixtures of tetraethylorthosilicate (TEOS) and diols: ethylene glycol (HO–CH2–CH2–OH) and 1,3 propane diol (HO–CH2–CH2–CH2–OH), in acid catalysis. The gels have been synthesized for a molar ratio H2O:TEOS = 4:1 and different molar ratios diol/TEOS: 0.25; 0.5; 0.75; 1.0; 1.25 and 1.5. The resulting gels were studied by thermal analysis and FT-IR spectroscopy, in order to evidence the interaction of diols with silica matrix. Thermal analysis indicated that the condensation degree increases with the molar ratio diol/TEOS until a certain value. The thermal decomposition of the organic chains bonded within the silica network in the temperature range 250–320 °C, leaded to a silica matrix with modified morphology. The adsorption–desorption isotherms type is different for the samples with and without diol. Thus, the specific surface areas have values <11 m2/g for the samples without diol and >200 m2/g for the samples with diols, depending on the annealing temperature.

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Authors and Affiliations

  1. Faculty of Industrial Chemistry and Environmental Engineering, University “Politehnica” of Timisoara, P-ta Victoriei no. 2, 300006, Timisoara, Romania

    Oana Ştefănescu, Marcela Stoia & Mircea Ştefănescu

  2. West University of Timisoara, Research Center “Thermal Analysis in the Environmental Field”, Str. Pestalozzi, no. 16, 300115, Timisoara, Romania

    Titus Vlase

Authors
  1. Oana Ştefănescu
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  2. Marcela Stoia
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  3. Mircea Ştefănescu
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  4. Titus Vlase
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Correspondence to Oana Ştefănescu.

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Ştefănescu, O., Stoia, M., Ştefănescu, M. et al. Study on the influence of teos–diol molar ratio on their chemical interaction during the gelation process. J Therm Anal Calorim 97, 251 (2009). https://doi.org/10.1007/s10973-009-0247-5

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  • DOI: https://doi.org/10.1007/s10973-009-0247-5

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