Published November 1993
| public
Journal Article
Kinetic Study of the Reactions of Chlorosilanes with Porous Vycor Glass
- Creators
- Kim, Soojin
- Gavalas, George R.
Abstract
The alternating reactions of SiCl_4 and H_2O with the surface of Vycor glass have been studied by thermogravimetric analysis at 400-600°C. The results are interpreted by postulating two types of silanol groups (Si-OH) on the Vycor surface, paired and isolated. Reaction of SiCl_4 with paired silanols proceeds by competing steps which control the total extent of silylation. Upon reaction with H_2O, all surface Si-Cl groups are hydrolyzed, reproducing Si-OH. Simultaneous silanol-silanol and silanol-surface chloride condensations eliminate H_2O or HCl to form new Si-O-Si bridges with final product silica. A kinetic model incorporating the silylation, hydrolysis, and condensation steps describes well the TGA data.
Additional Information
© 1993 Academic Press. Received Mach 15, 1993; accepted June 22, 1993. The authors appreciate the funding of this work by the Department of Energy under the University Coal Research Program, Grant DE-FG22-92PC92525.Additional details
- Eprint ID
- 60852
- DOI
- 10.1006/jcis.1993.1433
- Resolver ID
- CaltechAUTHORS:20151007-090428227
- DE-FG22-92PC92525
- Department of Energy (DOE)
- Created
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2015-10-07Created from EPrint's datestamp field
- Updated
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2021-11-10Created from EPrint's last_modified field