A study of the thermal polymerization of styrene by depolarized Rayleigh light scattering spectroscopy
| Autor: | G. R. Alms, G. D. Patterson, J. R. Stevens |
|---|---|
| Rok vydání: | 1979 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Relaxation (NMR) General Physics and Astronomy Polymer Photochemistry Molecular physics Light scattering Intensity (physics) Condensed Matter::Soft Condensed Matter chemistry.chemical_compound Monomer chemistry Orders of magnitude (time) Polymerization Physical and Theoretical Chemistry Spectroscopy |
| Zdroj: | The Journal of Chemical Physics. 70:2145-2154 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.437759 |
| Popis: | The technique of depolarized Rayleigh light scattering spectroscopy has been applied to follow the kinetics of the thermal polymerization of styrene. By measuring the spectrum of the depolarized scattered light we are able to separate the intensity of light scattered by the polymer being formed from the intensity of light scattered by the monomer. The spectrum consists of a wide Lorentzian due to the monomer and a central spike with instrumental width due to the polymer. This separation occurs because the polymer relaxation time which is determined by the longest Rouse–Zimm mode or by overall rotation is four orders of magnitude longer than the relaxation time of the monomer which is governed by overall rotation. Using the intensity data, the initial rate of the polymerization reaction is measured and is found to agree with the rate determined in previous experiments using classical techniques. After about one‐third of the reaction is complete, the rate increases by 50%. This increase in rate is interpret... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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