Thermal diffusion of dilute polymer solutions: The role of solvent viscosity

Autor:	Werner Köhler, J. Rauch, Marianne Hartung
Rok vydání:	2006
Předmět:	chemistry.chemical_classification Cyclohexane Chemistry Relative viscosity Ethyl acetate Analytical chemistry General Physics and Astronomy Polymer Toluene Solvent Viscosity chemistry.chemical_compound Polymer chemistry Physical and Theoretical Chemistry Benzene
Zdroj:	The Journal of Chemical Physics. 125:214904
ISSN:	1089-7690 0021-9606
DOI:	10.1063/1.2393230
Popis:	We have performed measurements of the thermal diffusion coefficient D(T) in the dilute limit on polystyrene in cyclo-octane, cyclohexane, benzene, toluene, tetrahydrofuran, ethyl acetate, and methyl ethyl ketone and of poly(dimethyl-siloxane) in toluene. These data have been combined with literature data to test various theoretical predictions. The viscosity is identified as the dominating and only relevant solvent parameter. On the polymer side, the size or mass of an effective correlated segment determines the strength of the Soret effect. Large and heavy effective segments, as found in stiffer chains, lead to higher D(T).
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3318b6d1fa3d54b19f8d6267391697d7 https://doi.org/10.1063/1.2393230 Zobrazit plný text záznamu