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Dielectric relaxations of polyether-based polyurethanes containing ionic liquids as antistatic agents
Akiko Tsurumaki1, Federico Bertasi2, Keti Vezzù3
1Global Innovation Research Organization, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan. ohnoh@cc.tuat.ac.jp and Department of Biotechnology, Tokyo University of Agriculture and Technology, Japan.
Physical Chemistry Chemical Physics : PCCP
|December 25, 2015
Summary
Polyurethanes with fixed ionic liquids (ILs) show enhanced antistatic properties due to improved ion mobility. Cation-fixed polymers (PU-CF) are most promising for antistatic applications.
Area of Science:
- Polymer Science
- Materials Science
- Dielectric Spectroscopy
Background:
- Polyurethanes (PUs) are versatile polymers with tunable properties.
- Ionic liquids (ILs) are explored as effective antistatic agents in polymers.
- Understanding ion mobility in PUs is crucial for antistatic performance.
Purpose of the Study:
- To investigate the dielectric properties of polyurethanes containing poly(propylene oxide) (PO) and poly(ethylene oxide) (EO) units.
- To compare the antistatic efficacy of PUs with different ionic liquid (IL) integration methods.
- To elucidate the relationship between IL chemical environment, ion mobility, and dielectric relaxation.
Main Methods:
- Direct current (DC) measurements to analyze charge current and electrode polarization.
- Broadband electrical spectroscopy (BES) to study dielectric relaxations.
- Comparison of pristine PUs with PUs containing ILs in various forms: anion-fixed (PU-AF), cation-fixed (PU-CF), and simple mixture (PU-IL).
Main Results:
- DC measurements indicate continuous dielectric relaxation alongside electrode polarization.
- BES reveals fast and slow relaxations in EO-rich domains of pristine PU and PU-AF.
- PU-CF and PU-IL exhibit enhanced ionic conductivity due to weakly interacting [Tf2N](-) ligands, leading to effective antistatic properties.
Conclusions:
- Ionic conductivity in EO/ion complexes is linked to ion exchange reactions.
- Weak interactions between [Tf2N](-) and EO chains in PU-CF and PU-IL enhance ion conduction.
- Cation-fixed polymers (PU-CF) offer superior antistatic effects and long-term stability due to lack of IL bleed-out, making them highly promising.
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