Light scattering of concentrated polydisperse polymer solutions
| Autor: | Th. G. Scholte |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Spinodal Cyclohexane Extrapolation Thermodynamics Polymer Light scattering Gibbs free energy Condensed Matter::Soft Condensed Matter chemistry.chemical_compound symbols.namesake chemistry Yield (chemistry) Polymer chemistry symbols Polystyrene |
| Zdroj: | Journal of Polymer Science Part C: Polymer Symposia. 39:281-291 |
| ISSN: | 1935-3065 0449-2994 |
| DOI: | 10.1002/polc.5070390125 |
| Popis: | On the basis of the Smoluchowski-Einstein-Zernike theory, it is shown that light-scattering measurements on mixtures can, in general, yield information about the second derivatives of the free enthalpy (Gibbs free energy) of mixing with respect to the concentrations. This method can be applied to concentrated solutions of polydisperse polymers or polymer mixtures. Integration of the appropriate experimental data yields the chemical potentials and the interaction parameters. From the same theory it follows that plotting of the reciprocal of the scattered-light intensity versus the temperature for a number of compositions, and extrapolation to zero yields the spinodal. This procedure does not initiate from any particular molecular model. It can be applied to simple polymer solutions, but equally well to more complicated systems such as two polymers in one solvent or a mixture of two or more polymers. Spinodals have been determined for solutions in cyclohexane of three polystyrene samples with the same weight-average molecular weight but differing in their width of distribution. |
| Databáze: | OpenAIRE |
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