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Rheology of Imidazolium-Based Ionic Liquids with Aromatic Functionality
1Department of Chemical Engineering, Texas Tech University , Lubbock, Texas 79409, United States.
This study characterizes imidazolium-based ionic liquids using rheology. Aromatic ionic liquids exhibit greater fragility compared to aliphatic analogs, with an observed anomalous aging effect.
Area of Science:
- Materials Science
- Physical Chemistry
- Polymer Science
Background:
- Ionic liquids (ILs) are versatile materials with tunable properties.
- Understanding the rheological behavior of ILs is crucial for their application.
- Imidazolium-based ILs with diverse substituents offer a platform for property modulation.
Purpose of the Study:
- To investigate the rheological properties of imidazolium-based ionic liquids with cyclic and aromatic groups.
- To analyze the temperature dependence of viscosity and time-temperature superposition.
- To compare the fragility of aromatic and aliphatic ILs and identify anomalous behavior.
Main Methods:
- Dynamic and steady shear rheology across a wide temperature range.
- Characterization of four imidazolium-based ionic liquids with bis[(trifluoromethane)sulfonyl]amide anion.
- Application of Vogel-Fulcher-Tammann (VFT) or Williams-Landel-Ferry (WLF) relationships.
Main Results:
- All investigated ionic liquids exhibited similar flow behavior with a glassy modulus near 1 GPa.
- Temperature dependencies of shift factors and viscosity followed VFT or WLF relationships.
- Aromatic ionic liquids displayed higher dynamic fragility (117-130) than aliphatic analogs.
- An anomalous aging effect in dynamic viscosity was observed with a strain-controlled rheometer but not with a stress-controlled rheometer.
Conclusions:
- Imidazolium-based ionic liquids show distinct rheological characteristics influenced by cation structure.
- Aromatic substituents lead to increased fragility in these ionic liquids.
- The choice of rheometer control mode can impact the observation of anomalous aging effects in ILs.
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