Sol-gel polymerization in alkoxysilanes

29Si NMR study and simulation of chemical kinetics

A. Vainrub, F. Devreux, J. P. Boilot, F. Chaput, M. Sarkar

    Research output: Contribution to journalArticle

    25 Citations (Scopus)

    Abstract

    We report on the results of 29Si NMR monitoring of alkoxysilane/ethanol/acid water sol-gels with tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS) and vinyltriethoxysilane (VTEOS). The gel time of the TEOS solution was 49 days at the degree of condensation c = 0.81, whereas MTEOS and VTEOS do not gel in spite of the high c = 0.95 achieved. The polymerization kinetics progressively slows with the time owing to the growth of sterical restrictions. To account for the effect we developed a kinetic model based on the reaction rates which explicitly decay as a function of the degree of condensation. The model describes the complete sol-gel process in all the studied systems including a gel transition in TEOS and aging of the gel.

    Original languageEnglish (US)
    Pages (from-to)197-200
    Number of pages4
    JournalMaterials Science and Engineering B
    Volume37
    Issue number1-3
    DOIs
    StatePublished - Feb 1996

    Fingerprint

    Reaction kinetics
    Sol-gels
    reaction kinetics
    Gels
    polymerization
    Polymerization
    Nuclear magnetic resonance
    gels
    nuclear magnetic resonance
    Condensation
    Polymers
    simulation
    condensation
    Kinetics
    Sol-gel process
    Reaction rates
    kinetics
    sol-gel processes
    Ethanol
    Aging of materials

    Keywords

    • Alkoxysilanes
    • Models of chemical kinetics
    • Nuclear magnetic resonance
    • Sol-gels

    ASJC Scopus subject areas

    • Materials Science(all)
    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Sol-gel polymerization in alkoxysilanes : 29Si NMR study and simulation of chemical kinetics. / Vainrub, A.; Devreux, F.; Boilot, J. P.; Chaput, F.; Sarkar, M.

    In: Materials Science and Engineering B, Vol. 37, No. 1-3, 02.1996, p. 197-200.

    Research output: Contribution to journalArticle

    Vainrub, A. ; Devreux, F. ; Boilot, J. P. ; Chaput, F. ; Sarkar, M. / Sol-gel polymerization in alkoxysilanes : 29Si NMR study and simulation of chemical kinetics. In: Materials Science and Engineering B. 1996 ; Vol. 37, No. 1-3. pp. 197-200.
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    abstract = "We report on the results of 29Si NMR monitoring of alkoxysilane/ethanol/acid water sol-gels with tetraethoxysilane (TEOS), methyltriethoxysilane (MTEOS) and vinyltriethoxysilane (VTEOS). The gel time of the TEOS solution was 49 days at the degree of condensation c = 0.81, whereas MTEOS and VTEOS do not gel in spite of the high c = 0.95 achieved. The polymerization kinetics progressively slows with the time owing to the growth of sterical restrictions. To account for the effect we developed a kinetic model based on the reaction rates which explicitly decay as a function of the degree of condensation. The model describes the complete sol-gel process in all the studied systems including a gel transition in TEOS and aging of the gel.",
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