A role of internal viscosity in the intrinsic hydrodynamic and rheooptical properties of polymer solutions
| Autor: | Anton Peterlin |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
chemistry.chemical_classification
Quantitative Biology::Biomolecules Intrinsic viscosity Relative viscosity General Engineering Inherent viscosity Thermodynamics Polymer Apparent viscosity Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Viscosity chemistry Temperature dependence of liquid viscosity Reduced viscosity |
| Zdroj: | Journal of Polymer Science: Polymer Symposia. 43:187-204 |
| ISSN: | 1936-0959 0360-8905 |
| DOI: | 10.1002/polc.5070430117 |
| Popis: | Exact treatment of intrinsic viscosity and streaming birefringence is possible for the limiting case of zero gradient where the coil dimensions are not yet perturbed by the flow. Experimental data on streaming birefringence in solvents of low viscosity suggested an internal viscosity characteristic for the polymer and independent of the viscosity of the solvent. More recent data on frequency dependence of viscosity in very viscous solvents unequivocally demand an internal viscosity proportional to the viscosity of the solvent. By reconsiderations of the possible origins of internal viscosity one indeed finds two contributions one prevailing at low and the other one at high solvent viscosity in good agreement with experimental data. The former is the original Kuhn-Cerf term based on energy barriers opposing rapid conformational changes. The latter is caused by the coupling of lateral and longitudinal displacement of chain elements as a consequence of conformational limitations by valency angles and bond orientation (g,g′,t). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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