Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sols in polar media

M W Daniels, J Sefcik, L F Francis, A V McCormick

Research output: Contribution to journalArticle

68 Citations (Scopus)

Abstract

Reactions of 3-glycidoxypropyltrimethoxysilane (GPS) in a water-rich environment with silica colloids were studied. Si-29 NMR spectroscopy was used to monitor quantitatively the variation in GPS hydrolysis, condensation, and adsorption with pH and water concentration. The results show the competition between adsorption on the silica surface and condensation polymerization of GPS in the bulk liquid and are used to identify conditions favorable to surface modification. The presence of colloidal silica was shown to increase the apparent GPS dimerization rate, suggesting either surface catalysis or an increased local reactant concentration in the electrical double layer around the silica colloids.

LanguageEnglish
Pages351-356
Number of pages6
JournalJournal of Colloid and Interface Science
Volume219
Issue number2
DOIs
Publication statusPublished - 15 Nov 1999

Fingerprint

Silanes
Coupling agents
Polymethyl Methacrylate
Sols
Silicon Dioxide
Silica
Colloids
Adsorption
Dimerization
Water
Polycondensation
Catalysis
Nuclear magnetic resonance spectroscopy
Surface treatment
Condensation
Hydrolysis
3-glycidoxypropyltrimethoxysilane
Liquids

Keywords

  • glycidoxypropyltrimethoxysilane
  • silica colloids
  • silane coupling agents
  • adsorption

Cite this

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title = "Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sols in polar media",
abstract = "Reactions of 3-glycidoxypropyltrimethoxysilane (GPS) in a water-rich environment with silica colloids were studied. Si-29 NMR spectroscopy was used to monitor quantitatively the variation in GPS hydrolysis, condensation, and adsorption with pH and water concentration. The results show the competition between adsorption on the silica surface and condensation polymerization of GPS in the bulk liquid and are used to identify conditions favorable to surface modification. The presence of colloidal silica was shown to increase the apparent GPS dimerization rate, suggesting either surface catalysis or an increased local reactant concentration in the electrical double layer around the silica colloids.",
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Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sols in polar media. / Daniels, M W ; Sefcik, J ; Francis, L F ; McCormick, A V .

In: Journal of Colloid and Interface Science, Vol. 219, No. 2, 15.11.1999, p. 351-356.

Research output: Contribution to journalArticle

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T1 - Reactions of a trifunctional silane coupling agent in the presence of colloidal silica sols in polar media

AU - Daniels, M W

AU - Sefcik, J

AU - Francis, L F

AU - McCormick, A V

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Y1 - 1999/11/15

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KW - glycidoxypropyltrimethoxysilane

KW - silica colloids

KW - silane coupling agents

KW - adsorption

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