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| Titel: |
The Influence of the Polymer Chain on the Catalysis by Variable Valency Metal Complexes |
| Auteur: |
Artemov, A. V. Vainstein, E. F. |
| Verschenen in: |
International journal of polymeric materials |
| Paginering: | Jaargang 43 (1999) nr. 1-2 pagina's 137-155 |
| Jaar: |
1999-04-01 |
| Inhoud: |
The role of the polymeric chain in catalysis has been considered for the case when the chain by itself possesses to catalytic activity. The catalysts studied were the complexes of variable valence metals and polyethyleneglycols of different molecular masses (M). The extreme in dependence of the atomic catalytic activity (ACA) on M (with the amount of the metal in the chain being constant), as well as a drop in ACA with the increase of metal content in the chain (with M being constant), result from irreversible conformations of the intermediates formed on opening of the metal-chain cycle. These dependencies are stipulated by changes in entropy. The activation energy depends solely on the metal nature. The change in the initial reaction rate correlates with the difference of the characteristic viscosities of the starting polymer and its complexes. The use of the “chain” effect in a number of other reactions and catalytic systems is also discussed. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 10 van 11 gevonden artikelen
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