| Autor: | Zhengping Zhang, Man-Ho Lee, Richard F. Reidy, Ruthanne D. Thomas, Hanjiang Dong, Dennis Mueller |
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| Rok vydání: | 2003 |
| Předmět: |
Steric effects
Condensation polymer Chemistry Methyltrimethoxysilane General Chemistry Nuclear magnetic resonance spectroscopy Condensed Matter Physics Condensation reaction Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound Reaction rate constant Polymerization Polymer chemistry Materials Chemistry Ceramics and Composites Organic chemistry Reactivity (chemistry) |
| Zdroj: | Journal of Sol-Gel Science and Technology. 28:5-14 |
| ISSN: | 0928-0707 |
| Popis: | 29Si solution NMR has been used to study the acid-catalyzed polymerization of methyltrimethoxysilane (MTMS) in ethanol. The complex reaction pathways have been analyzed, and the general trends described. New interpretations are given to the rate constants of condensation reactions. The steric effects and inductive effects are found to work in coordination to reduce the reactivity of the silicon sites with the increasing connectivity. The extensive cyclization is attributed to the low steric effects of a tetramer ring closure compared to other end/end species condensations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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