Water/PEG Mixtures: Phase Behavior, Dynamics and Soft Confinement

Polyethylene glycol is water soluble and forms an eutectic system with water. The eutectic temperature is −19 °C for =1500 g mol and increases with molecular weight. The dielectric relaxation spectrum of the mixtures exhibits a strong loss maximum in ″ ( ) similar to pure water. Relaxation time incr...

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Published inZeitschrift für physikalische Chemie (Neue Folge) Vol. 232; no. 7; pp. 1089 - 1110
Main Authors Kuttich, Björn, Matt, Alexander, Weber, Andreas, Grefe, Ann-Kathrin, Vietze, Laura, Stühn, Bernd
Format Journal Article
LanguageEnglish
Published Munich De Gruyter 26.07.2018
Walter de Gruyter GmbH
Subjects
Bending modulus
confinement
Dependence
Dielectric relaxation
dielectric spectroscopy
Dielectric strength
Droplets
Ethanol
microemulsion
Microemulsions
Molecular chains
NSE
Polyethylene glycol
Relaxation time
SANS
SAXS
Water drops
water/PEG
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Summary:Polyethylene glycol is water soluble and forms an eutectic system with water. The eutectic temperature is −19 °C for =1500 g mol and increases with molecular weight. The dielectric relaxation spectrum of the mixtures exhibits a strong loss maximum in ″ ( ) similar to pure water. Relaxation time increases with the addition of PEG. Activation energies exhibit a maximum of 0.35 eV at molar fraction ≈0.2. This compares well with results on ethanol water mixtures. Adding PEG molecules to nanoscopic water droplets of inverse microemulsions has only small impact on the bending modulus of a non-ionic microemulsion. In AOT based microemulsions an increase or decrease of is found in dependence on the size of the droplets. This is in accordance with the variation of the dynamic percolation transition in the same systems.
ISSN:0942-9352
2196-7156
DOI:10.1515/zpch-2017-1018