Electron spin resonance studies of reversible addition-fragmentation transfer polymerisation
| Autor: | Ronald D. Sanderson, Matthew P. Tonge, FM Calitz |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Reaction mechanism
Polymers and Plastics Chemistry Organic Chemistry Radical polymerization Chain transfer Raft Condensed Matter Physics Styrene law.invention chemistry.chemical_compound Polymerization law Polymer chemistry Materials Chemistry Physical chemistry Electron paramagnetic resonance Macromolecule |
| Zdroj: | Macromolecular Symposia. 193:277-288 |
| ISSN: | 1521-3900 1022-1360 |
| DOI: | 10.1002/masy.200390059 |
| Popis: | The polymerisation of styrene in the presence of cumyl dithiobenzoate (RAFT agent) was studied. Electron spin resonance spectroscopy was used to determine the time-dependence of the concentrations of the intermediate radical species, as a function of temperature and relative initial amounts of reactants. The intermediate radical concentration was found to be much lower than predicted by the studies of Barner-Kowollik et al.[Barner-Kowollik, C.; Quinn, J. F.; Morsley, D. R.; Davis, T. P. J. Polym. Sci. Part A: Polym. Chem. 2001, 39, 1353], but consistent with that observed by Hawthorne et al.[Hawthorne, D. G.; Moad, G.; Rizzardo, E.; Thang, S. H. Macromolecules 1999, 32, 5457] and Kwak et al.[Kwak, Y.; Goto, A.; Tsujii, Y.; Murata, Y.; Komatsu, K.; Fukuda, T. Macromolecules 2002, 35, 3026] Several observations that are not consistent with the current RAFT model were made. Intermediate radical signals were observed long after a significant amount of initiator remained and an extra signal appeared in the ESR spectrum at longer reaction times. |
| Databáze: | OpenAIRE |
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