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Article
Copolymerization kinetics of a model siloxane system
Article first published online: 21 JAN 2000
DOI: 10.1002/(SICI)1099-0518(199705)35:7<1293::AID-POLA15>3.0.CO;2-3
Copyright © 1997 John Wiley & Sons, Inc.
Issue
1099-0518/asset/cover.gif?v=1&s=64cb9b1d129d058a6e438dd5e605025a7bcef0c6 "Journal of Polymer Science Part A: Polymer Chemistry")
Journal of Polymer Science Part A: Polymer Chemistry
Volume 35, Issue 7, pages 1293–1302, May 1997
Additional Information
How to Cite
Rankin, S. E., Macosko, C. W. and McCormick, A. V. (1997), Copolymerization kinetics of a model siloxane system. Journal of Polymer Science Part A: Polymer Chemistry, 35: 1293–1302. doi: 10.1002/(SICI)1099-0518(199705)35:7<1293::AID-POLA15>3.0.CO;2-3
Publication History
- Issue published online: 21 JAN 2000
- Article first published online: 21 JAN 2000
- Manuscript Accepted: 22 OCT 1996
- Manuscript Received: 15 JUL 1996
Funded by
- National Science Foundation
- Dow Corning Corp.
- Abstract
- References
- Cited By
Keywords:
- methylethoxysilanes;
- hydrolysis;
- polycondensation;
- sol-gel;
- modeling
Abstract
Using 29Si NMR, we monitor the copolymerization of trimethylethoxysilane and dimethyldiethoxysilane (model compounds for more complex sol-gel copolymer systems) in a batch reactor. Under the chosen conditions, the extents of self- and cross-condensation reactions are readily determined. Using a nonideal polycondensation kinetic model, we show that the copolymerization rate coefficient for a pair of sites of differing functionality is bounded by their homopolymerization rate coefficients, lying closer to the larger one. This reactivity pattern generates a heterogeneous monomer distribution in the copolymerization products. © 1997 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 35: 1293–1302, 1997