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 journalArticlepeer-review

25 Scopus citations

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
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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