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Journal Article

Unusual thermal diffusion in polymer solutions

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons47761

de Gans,  B. J.
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48185

Kita,  Rio
MPI for Polymer Research, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons48998

Wiegand,  Simone
MPI for Polymer Research, Max Planck Society;

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Citation

de Gans, B. J., Kita, R., Wiegand, S., & Luettmer-Strathmann, J. (2003). Unusual thermal diffusion in polymer solutions. Physical Review Letters, 91(24): 245501.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-63C1-B
Abstract
Thermal diffusion forced Rayleigh scattering results on thermal diffusion of poly(ethylene oxide) (PEO) in ethanol/water mixtures are presented. In water-rich solvent mixtures, PEO is found to migrate towards regions of lower temperature. This is typical for polymer solutions and corresponds to a positive Soret coefficient of PEO. In solvent mixtures with low water content, however, the polymer is found to migrate towards higher temperatures, corresponding to a negative Soret coefficient of PEO in ethanol-rich solutions. To our knowledge, this is the first observed sign change of the Soret coefficient of a polymer in solution. We also present a simple lattice model for the polymer solvent system and calculate Soret coefficients with statistical mechanics methods. The calculated values agree qualitatively with the experimental results.