On the theory of thermal diffusion in dilute polymer solutions

Autor:	T. N. Khazanovich
Rok vydání:	2007
Předmět:	Condensed Matter::Soft Condensed Matter Diffusion layer chemistry.chemical_classification Quantitative Biology::Biomolecules Molecular diffusion Diffusion equation Chemistry Thermodynamics Effective diffusion coefficient Polymer Thermal diffusivity Kinetic energy Fick's laws of diffusion
Zdroj:	Journal of Polymer Science Part C: Polymer Symposia. 16:2463-2468
ISSN:	1935-3065 0449-2994
DOI:	10.1002/polc.5070160457
Popis:	The thermal diffusion coefficient in highly diluted polymer solutions is calculated. The pearl necklace model is used for description of flexible macromolecule dynamics. It is assumed that the usual diffusion equation holds under non-uniform temperature conditions, but the coefficients of equation are variables. Free-draining flexible macromolecules are considered. The thermal diffusion coefficient is found to be proportional to the bead diffusion constant and therefore is controlled by the kinetic flexibility of chain. In accordance with experiment the thermal diffusion coefficient does not depend on molecular weight and concentration. With eq. (9) it is possible to calculate from experimental data the bead diffusion constant and therefore to obtain the kinetic rigidity of the polymer.
Databáze:	OpenAIRE
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