This title appears in the Scientific Report :
2014
Please use the identifier:
http://hdl.handle.net/2128/7924 in citations.
Please use the identifier: http://dx.doi.org/10.1063/1.4891720 in citations.
Molar mass and temperature dependence of the thermodiffusion of polyethylene oxide in water/ethanol mixtures
Molar mass and temperature dependence of the thermodiffusion of polyethylene oxide in water/ethanol mixtures
In this work we study the molar mass dependence of the thermodiffusion of polyethylene oxide at different temperatures in ethanol, water/ethanol mixture (c_water=0.7) and water in a molar mass range up to M_w=180000 g/mol. Due to the low solubility of polyethylene oxide oligomers in ethanol the meas...
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Personal Name(s): | Wang, Zilin |
---|---|
Afanasenkau, Dzmitry / Dong, Minjie / Huang, Danni / Wiegand, Simone (Corresponding Author) | |
Contributing Institute: |
Weiche Materie; ICS-3 |
Published in: | The @journal of chemical physics, 141 (2014) 6, S. 064904 |
Imprint: |
Melville, NY
American Institute of Physics
2014
|
DOI: |
10.1063/1.4891720 |
Document Type: |
Journal Article |
Research Program: |
Soft Matter Composites |
Link: |
OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1063/1.4891720 in citations.
In this work we study the molar mass dependence of the thermodiffusion of polyethylene oxide at different temperatures in ethanol, water/ethanol mixture (c_water=0.7) and water in a molar mass range up to M_w=180000 g/mol. Due to the low solubility of polyethylene oxide oligomers in ethanol the measurements are limited up to M_w=2200 g/mol. The specific water/ethanol concentration 0.7 has been chosen, because at this weight fraction the thermal diffusion coefficient, D_T, of water/ethanol vanishes so that the system can be treated as a pseudo binary mixture. The addition of ethanol will degrade the solvent quality, so that we expect a change of the interaction energies between polymer and solvent. The analysis of the experimental data within a theoretical model shows the need of a refined model, which takes specific interactions into account. |