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Adsorption of silane coupling agents onto kaolinite surfaces

Published online by Cambridge University Press:  09 July 2018

U. Johansson ,
A. Holmgren ,
W. Forsling  and
R. L. Frost
U. Johansson
Affiliation:
Department of Chemical and Metallurgical Engineering, Division of Inorganic Chemistry, Luleå University of Technology, SE-971 87 Luleå, Sweden
A. Holmgren
Affiliation:
Department of Chemical and Metallurgical Engineering, Division of Inorganic Chemistry, Luleå University of Technology, SE-971 87 Luleå, Sweden
W. Forsling
Affiliation:
Department of Chemical and Metallurgical Engineering, Division of Inorganic Chemistry, Luleå University of Technology, SE-971 87 Luleå, Sweden
R. L. Frost
Affiliation:
Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, 2 George Street, Brisbane, GPO Box 2434, Queensland 4001, Australia
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Abstract

The adsorption of the silane coupling agents N-(2-amino-ethyl)-3-aminopropyl- trimethoxysilane (Z-6020), N-(2-(vinylbenzyl-amino)-ethyl)-3-amino-propyl-trimethoxysilane (Z-6032) and 3-glycidoxy-propyl-trimethoxysilane (Z-6040) onto the surface of kaolinite has been studied using the solvents water and ethanol. The adsorbed silanes were analysed using diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy and FT-Raman spectroscopy. When the silane coupling agents are dissolved in water, silanol groups are formed. Raman spectra of aqueous solutions of the silanes show that condensation of the silanols into oligomers occurred. The peak at 1000 cm-1 assigned to Si–O–Si vibrations indicates that polymerization has occurred. A similar behaviour is observed when the silanes are dissolved in ethanol. The DRIFT spectra show that the silane coupling agents adsorb onto the surface of kaolinite. It is proposed that the oligomers are bonded to the kaolinite surface only by hydrogen bondings with no covalent bonds formed.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 2 , June 1999 , pp. 239 - 246
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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