Koch, T. ; Strobl, G. ; Stühn, B. (1992):
Light-scattering study of fluctuations in concentration, density, and local anisotropy in polystyrene-dioxane mixtures.
In: Macromolecules, 25 (23), pp. 6255-6261. [Article]
Abstract
Static and dynamic light scattering was applied in a comprehensive study of the different modes of relaxatory motion in polystyrene-dioxane mixtures, comprising the whole range of different compositions from dilute solution to plasticized melts. For the analysis of data measured in the presence of the nearly elastic anomalous excess scattering usually encountered in concentrated solutions and the melt, a generalized Siegert relation was used. Analysis of depolarized dynamic scattering data obtained for the PS-rich mixtures indicates a simple Vogel-Fulcher temperature dependence for the relaxation rates of the anisotropy fluctuations with T(g) as the only relevant parameter. The dynamics observed in polarized scattering continuously changes its character, being dominated at low temperatures and high concentrations by density fluctuations and in the limit of high temperatures and low concentrations by concentration fluctuations. Density and anisotropy fluctuations show identical relaxation rates.
| Item Type: | Article |
|---|---|
| Erschienen: | 1992 |
| Creators: | Koch, T. ; Strobl, G. ; Stühn, B. |
| Title: | Light-scattering study of fluctuations in concentration, density, and local anisotropy in polystyrene-dioxane mixtures |
| Language: | English |
| Abstract: | Static and dynamic light scattering was applied in a comprehensive study of the different modes of relaxatory motion in polystyrene-dioxane mixtures, comprising the whole range of different compositions from dilute solution to plasticized melts. For the analysis of data measured in the presence of the nearly elastic anomalous excess scattering usually encountered in concentrated solutions and the melt, a generalized Siegert relation was used. Analysis of depolarized dynamic scattering data obtained for the PS-rich mixtures indicates a simple Vogel-Fulcher temperature dependence for the relaxation rates of the anisotropy fluctuations with T(g) as the only relevant parameter. The dynamics observed in polarized scattering continuously changes its character, being dominated at low temperatures and high concentrations by density fluctuations and in the limit of high temperatures and low concentrations by concentration fluctuations. Density and anisotropy fluctuations show identical relaxation rates. |
| Journal or Publication Title: | Macromolecules |
| Volume of the journal: | 25 |
| Issue Number: | 23 |
| Divisions: | 05 Department of Physics > Institute for condensed matter physics (2021 merged in Institute for Condensed Matter Physics) 05 Department of Physics |
| Date Deposited: | 26 Feb 2010 13:45 |
| PPN: | |
| Export: | |
| Suche nach Titel in: | TUfind oder in Google |
 |
Send an inquiry |
Options (only for editors)
 |
Show editorial Details |
Drucken
Impressum