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

Hartung, M.; Rauch, J.; Köhler, W.
December 2006
Journal of Chemical Physics;12/7/2006, Vol. 125 Issue 21, p214904
Academic Journal
We have performed measurements of the thermal diffusion coefficient DT 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 DT.


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