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Interactions within a [ionic liquid + poly(ethylene glycol)] mixture revealed by temperature-dependent synergistic
Shruti Trivedi1, Siddharth Pandey
1Department of Chemistry, Indian Institute of Technology, Delhi, Hauz Khas, New Delhi, India.
The Journal of Physical Chemistry. B
|May 20, 2011
Summary
Ionic liquid and poly(ethylene glycol) mixtures exhibit Newtonian fluid behavior. Higher molecular weight PEGs with [bmim][PF(6)] show viscosity synergism due to hydrogen bonding, unlike lower MW PEGs.
Area of Science:
- Physical Chemistry
- Materials Science
- Chemical Engineering
Background:
- Ionic liquids (ILs) and poly(ethylene glycol) (PEG) are versatile materials.
- Mixtures of ILs and PEGs can form media with tunable properties.
- Understanding the viscosity of these mixtures is crucial for applications.
Purpose of the Study:
- To investigate the dynamic viscosity of 1-butyl-3-methylimidazolium hexafluorophosphate ([bmim][PF(6)]) and PEG mixtures.
- To explore the effect of PEG molecular weight and temperature on mixture viscosity.
- To elucidate the intermolecular interactions governing viscosity behavior.
Main Methods:
- Dynamic viscosity measurements across a range of temperatures (10-90 °C) and compositions.
- Analysis of temperature dependence using Arrhenius-type behavior.
- Fourier-transform infrared (FTIR) spectroscopy to detect hydrogen bonding.
- Microviscosity measurements using a fluorescence probe (1,3-bis(1-pyrenyl)propane).
Main Results:
- All ([bmim][PF(6)] + PEG) mixtures exhibit Newtonian fluid behavior following Arrhenius-type temperature dependence.
- Mixtures with higher MW PEGs (PEG600, PEG1000) display significant viscosity synergism (hyperviscosity).
- Hydrogen bonding is identified as the primary driver for viscosity synergism, particularly in higher MW PEG mixtures.
Conclusions:
- Viscosity synergism in ([bmim][PF(6)] + PEG) mixtures is attributed to strong hydrogen bonding interactions.
- The extent of synergism depends on PEG molecular weight and temperature.
- Microviscosity measurements corroborate dynamic viscosity findings, highlighting the dominant role of H-bonding.
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