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Hydrocarbon dispersion of nanospherical silica by a sol–gel process. 2. Alkoxysilane copolymerization

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Abstract.

The preparation of hydrocarbon dispersions of nanospherical silica–silicone hybrids by copolymerization of tetraethoxysilane (TEOS) and alkylethoxysilanes such as methyltriethoxysilane (MTEOS) and dimethyldiethoxysilane using a sol–gel process was investigated. Particles completely dispersible in hexane with a diameter in the range 10–24 nm were obtained by means of TEOS and MTEOS copolymerization, using ethanol or methanol as a solvent and a terminator. The solubility of the nanospheres was shown to be dependent on the molar ratio of water to silicon, the reaction time, the terminator concentration as well as the stirring condition. The hexane-dispersible particles have hydroxyl and methyl groups on the surface. A higher conversion of organophilic silica–silicon nanoparticles was attained using trimethylchlorosilane as a terminator and a water-to-silicon molar ratio close to 9.

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Authors and Affiliations

  1. CODAP, Universidade Federal de Sergipe, Cidade Universitária, 49100-000, Aracaju, SE, Brazil, , , , ,

    M. Pedroso

  2. Departamento de Processos Orgânicos, Escola de Química, Universidade Federal do Rio de Janeiro, C.P. 68522, 21949-900, Rio de Janeiro, RJ, Brazil, , , , ,

    C. Mothé

  3. Instituto de Macromoléculas Professora Eloisa Mano, Universidade Federal do Rio de Janeiro, C.P. 68525, 21945-970 Rio de Janeiro, RJ, Brazil, , , , ,

    M. Dias

  4. The University of the Air, Setagaya Gakushu Center, 4-1-1, Shimouma, Setagaya-Ku, Tokyo 154, Japan, , , , ,

    C. Azuma

  5. Departamento de Química Orgânica, Instituto de Química, Universidade Federal do Rio de Janeiro, C.P. 68556, 21941-972 Rio de Janeiro, RJ, Brazil, , , , ,

    R. San Gil

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  1. M. Pedroso
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  2. M. Dias
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  3. C. Azuma
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  4. R. San Gil
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  5. C. Mothé
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Pedroso, .M., Dias, .M., Azuma, .C. et al. Hydrocarbon dispersion of nanospherical silica by a sol–gel process. 2. Alkoxysilane copolymerization. Colloid Polym Sci 281, 19–26 (2003). https://doi.org/10.1007/s00396-002-0726-8

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  • DOI: https://doi.org/10.1007/s00396-002-0726-8

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