title: Molar mass and temperature dependence of the thermodiffusion of polyethylene oxide in water/ethanol mixtures.
abstract: 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) = 180,000 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.
authors.affiliation: ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany.
authors.forename: Zilin
authors.initials: Z
authors.lastname: Wang
authors.affiliation: ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany.
authors.forename: Dzmitry
authors.initials: D
authors.lastname: Afanasenkau
authors.affiliation: ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany.
authors.forename: Minjie
authors.initials: M
authors.lastname: Dong
authors.affiliation: ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany.
authors.forename: Danni
authors.initials: D
authors.lastname: Huang
authors.affiliation: ICS-3 Soft Condensed Matter, Forschungszentrum Jülich GmbH, D-52428 Jülich, Germany.
authors.forename: Simone
authors.initials: S
authors.lastname: Wiegand