| Pressure effects on the alpha and alpha' relaxations in polymethylphenylsiloxane (2006) | |||||||||||||
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| Soret coefficient PNiPAM alcohols and water Rio Kita Pavel Polyakov and Simone Wiegand Department Physics School Science Tokai University Hiratsuka Japan and Max Planck Institut Polymerforschung Ackermannweg Mainz Germany Forschungszentrum lich IFF Weiche Materie Leo Brandt Str lich Germany rkita keyaki tokai ABSTRACT will report Soret coefficients PNiPAM poly isopropylacrylamide water and alcohols studied the temperature range from C obtained thermal diffusion forced Rayleigh scattering TDFRS PNiPAM water has temperature where coil globule transition PNiPAM takes place heating The temperature dependence the Soret coefficient for the system shows strong peak the temperature where the sign Soret coefficient positive all temperatures measured For the systems alcohol solutions PNiPAM used alcohols with the number carbon atoms and with taking into account their positional isomers The studied temperature PNiPAM methanol and ethanol show positive Soret coefficients whereas PNiPAM has negative Soret coefficient alcohols with and propanol propanol butanol and methyl propanol ethanol the temperature dependence the Soret coefficient PNiPAM shows sign change from positive negative heating These experimental results the temperature dependence the Soret coefficient the variation alcohols the solvent will discussed with taking into account the Hildebrand solubility parameters KEYWORDS alcohol Hidebrand solubility parameter PNiPAM Soret coefficient thermal diffusion thetatemperature water I | |||||||||||||
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