Universität zu Köln

Wang, Zilin, Afanasenkau, Dzmitry, Dong, Minjie, Huang, Danni and Wiegand, Simone ORCID: 0000-0001-6333-1956 (2014). Molar mass and temperature dependence of the thermodiffusion of polyethylene oxide in water/ethanol mixtures. J. Chem. Phys., 141 (6). MELVILLE: AMER INST PHYSICS. ISSN 1089-7690

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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. (C) 2014 AIP Publishing LLC.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Wang, Zilin UNSPECIFIED UNSPECIFIED UNSPECIFIED Afanasenkau, Dzmitry UNSPECIFIED UNSPECIFIED UNSPECIFIED Dong, Minjie UNSPECIFIED UNSPECIFIED UNSPECIFIED Huang, Danni UNSPECIFIED UNSPECIFIED UNSPECIFIED Wiegand, Simone UNSPECIFIED orcid.org/0000-0001-6333-1956 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-431994
DOI:	10.1063/1.4891720
Journal or Publication Title:	J. Chem. Phys.
Volume:	141
Number:	6
Date:	2014
Publisher:	AMER INST PHYSICS
Place of Publication:	MELVILLE
ISSN:	1089-7690
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Chemistry > Institute of Physical Chemistry
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language THERMAL-DIFFUSION; SORET COEFFICIENT; POLYMER-SOLUTIONS; LATTICE MODEL; WATER; DILUTE; POLYSTYRENE; MOLECULES Multiple languages Chemistry, Physical; Physics, Atomic, Molecular & Chemical Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/43199