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Enhanced Electrorheological Performance of Core-Shell-Structured Polymerized Ionic Liquid@Doubly Polymerized Ionic
Yudong Wang1, Ruijing Ma1, Wuyang Nie1
1Smart Materials Laboratory, Department of Applied Physics, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China.
Langmuir : the ACS Journal of Surfaces and Colloids
|September 22, 2023
Summary
This study developed core-shell polymerized ionic liquid@doubly polymerized ionic liquid (PIL@D-PIL) microspheres. These novel microspheres significantly improve electrorheological fluid performance by enhancing thermal stability and expanding the working temperature range.
Area of Science:
- Materials Science
- Polymer Chemistry
- Colloid and Surface Chemistry
Background:
- Polymerized ionic liquids (PILs) are promising for electrorheological fluids (ERFs) due to hydrophobic ion pairs.
- Linear PILs suffer from low glass-transition temperatures, leading to high leaking currents and narrow operating ranges in ERFs.
- Addressing these limitations is crucial for advancing PIL-based ERF technology.
Purpose of the Study:
- To engineer core-shell structured PIL@D-PIL microspheres.
- To investigate the impact of a doubly polymerized ionic liquid (D-PIL) shell on the properties of a PIL core.
- To evaluate the performance enhancement of PIL@D-PIL based ERFs.
Main Methods:
- Synthesis of PIL@D-PIL microspheres using evaporation-assisted dispersion polymerization.
- Characterization of microsphere morphology via scanning electron microscopy (SEM) and transmission electron microscopy (TEM).
- Thermal property analysis using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA).
- Evaluation of electrorheological (ER) effect and dielectric properties using rheometry and dielectric spectroscopy.
Main Results:
- The D-PIL shell successfully coated the PIL core, forming stable microspheres.
- The PIL@D-PIL microspheres exhibited increased glass-transition temperature and improved thermal stability compared to bare PIL.
- The electrorheological fluid formulated with PIL@D-PIL microspheres showed significantly reduced leaking current density.
- An expanded operating temperature range was observed for the PIL@D-PIL based ERF, maintaining performance above the PIL core's glass-transition temperature.
Conclusions:
- The core-shell PIL@D-PIL structure effectively mitigates the limitations of linear PILs in ERFs.
- The D-PIL shell provides thermal and structural protection, enhancing the overall performance and durability of the ER fluid.
- This approach offers a viable strategy for developing high-performance, water-free electrorheological fluids based on polymerized ionic liquids.
