Sign change of the Soret coefficient of poly(ethylene oxide) in water/ethanol mixtures observed by thermal diffusion forced Rayleigh scattering
作者： Rio Kita , Simone Wiegand , Jutta Luettmer-Strathmann
DOI: 10.1063/1.1771631
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摘要: Soret coefficients of the ternary system poly(ethylene oxide) in mixed water/ethanol solvent were measured over a wide composition range by means thermal diffusion forced Rayleigh scattering. The coefficient ST polymer was found to change sign as water content increases with taking place at mass fraction 0.83 temperature 22 °C. For high concentrations, value is positive, i.e., migrates cooler regions fluid, typical for polymers good solvents. low content, on other hand, negative, warmer fluid. Measurements two different concentrations showed larger magnitude smaller concentration. dependence investigated water-rich solutions and revealed s...
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