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Methyl modified siloxane melting gels for hydrophobic films

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Abstract

Hybrid melting gels were prepared by a sol–gel process, starting with a mono-substituted siloxane and a di-substituted siloxane. Methyl-modified melting gels were prepared using (a) methyltriethoxysilane (MTES) with dimethyldiethoxysilane (DMDES) and (b) methyltrimethoxysilane (MTMS) together with dimethyldimethoxysilane (DMDMS). The gels with MTES–DMDES were prepared with concentrations between 50–50 and 75–25 mol%. The gels with MTMS–DMDMS were prepared with concentrations between 50–50 and 70–30 mol%. For both systems, the consolidation temperature, after which the melting gel no longer softens, increased with an increase in the amount of the mono-substituted siloxane, increasing from 135 to 160 °C for MTES–DMDES and increasing from 145 to 170 °C for MTMS–DMDMS. Coatings formed on mica substrates were about 1 mm thick, and showed no visible cracks. The surfaces of the coatings were profiled using micro-Raman spectroscopy, which revealed that methyl groups were concentrated at the surfaces of the films. All contact angles measured with water were greater than 90°.

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Authors and Affiliations

  1. Department of Chemistry, Lehman College, City University of New York, Davis Hall, 250 Bedford Park Boulevard West, Bronx, NY, 10468, USA

    Andrei Jitianu

  2. Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ, 08854, USA

    Andrei Jitianu, John Doyle, Glenn Amatucci & Lisa C. Klein

  3. Energy Storage Group, Rutgers University, 607 Taylor Road, Piscataway, NJ, 08854, USA

    Glenn Amatucci

Authors
  1. Andrei Jitianu
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  2. John Doyle
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  3. Glenn Amatucci
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  4. Lisa C. Klein
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Correspondence to Lisa C. Klein.

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Jitianu, A., Doyle, J., Amatucci, G. et al. Methyl modified siloxane melting gels for hydrophobic films. J Sol-Gel Sci Technol 53, 272–279 (2010). https://doi.org/10.1007/s10971-009-2087-y

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  • DOI: https://doi.org/10.1007/s10971-009-2087-y

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