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

Michael W. Daniels, Jan Sefcik, Lorraine F. Francis, Alon V. McCormick

Research output: Contribution to journalArticlepeer-review

69 Scopus citations

Abstract

Reactions of 3-glycidoxypropyltrimethoxysilane (GPS) in a water-rich environment with silica colloids were studied. 29Si 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.

Original languageEnglish (US)
Pages (from-to)351-356
Number of pages6
JournalJournal of Colloid And Interface Science
Volume219
Issue number2
DOIs
StatePublished - Nov 15 1999

Bibliographical note

Funding Information:
This work was supported by the Center for Interfacial Engineering, an NSF Engineering Research Center at the University of Minnesota. We are grateful for discussions with Dr. Lixin Chu.

Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

Keywords

  • Adsorption
  • Glycidoxypropyltrimethoxysilane
  • Silane coupling agents
  • Silica colloids

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