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Use of an Organosilane Coupling Agent in Colloidal Silica Coatings

Published online by Cambridge University Press:  10 February 2011

M. W. Daniels ,
L. Chu  and
L. F. Francis
M. W. Daniels
Affiliation:
University of Minnesota, Department of Chemical Engineering and Materials Science, 421 Washington Ave. SE, Minneapolis, MN. 55455
L. Chu
Affiliation:
University of Minnesota, Department of Chemical Engineering and Materials Science, 421 Washington Ave. SE, Minneapolis, MN. 55455
L. F. Francis
Affiliation:
University of Minnesota, Department of Chemical Engineering and Materials Science, 421 Washington Ave. SE, Minneapolis, MN. 55455
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Abstract

Coatings were prepared from suspensions containing colloidal silica (20nm) in isopropanol and 3-glycidoxypropyltrimethoxysilane (GPS). Thicker coatings without cracks were achieved by increased addition of GPS. The microstructure of the resultant coatings contained well packed colloids with some pore space. When high amounts of GPS were added (i.e., GPS:silica weight ratio (R) greater than 0.5), polymeric material appeared and covered the necks between particles and filled in pores. 29Si NMR of coating suspensions (R=l) showed GPS hydrolysis within a few minutes and GPS adsorption on the silica surface within a few hours. The excess silane remained in solution and further polymerized, instead of forming a thick multilayer on the colloids. Diffuse reflectance IR spectroscopy data suggests saturated surface coverage beginning around 2 to 3 molecules/nm2 based on observed depletion of silica surface hydroxyls.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 435: Symposium V – Better Ceramics Through Chemistry VII , 1996 , 215
Copyright
Copyright © Materials Research Society 1996

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