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Specific solubility behavior of quaternary ammonium-based poly(ionic liquid) particles by changing counter anion
Masayoshi Tokuda1, Hideto Minami
1Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe, Japan.
Journal of Colloid and Interface Science
|March 12, 2013
Summary
Poly(ionic liquid) particles with [TFSA] anions show unique solubility in ethanol, dissolving and forming hollow structures when LiBr is added. This anion exchange behavior is concentration-dependent.
Area of Science:
- Polymer Chemistry
- Materials Science
- Physical Chemistry
Background:
- Poly(ionic liquids) (PILs) are advanced materials with tunable properties.
- The solubility of PILs is influenced by their ionic structure, particularly the counter anion.
- Controlling PIL solubility is key to developing novel materials and applications.
Purpose of the Study:
- To investigate the solubility behavior of poly(ionic liquid) ([MTMA][TFSA]) particles in ethanol.
- To explore the effect of counter anion exchange on PIL solubility.
- To demonstrate the preparation of hollow PIL structures using controlled dissolution.
Main Methods:
- Dispersion polymerization was used to synthesize poly([2-(methacryloyloxy)ethyl]trimethylammonium bis(trifluoromethanesulfonyl)amide) ([MTMA][TFSA]) particles.
- PIL solubility was tested in ethanol with varying concentrations of LiBr.
- Anion exchange on particle surfaces was analyzed.
- Microscopy techniques were employed to observe particle morphology changes.
Main Results:
- PILs with [TFSA] anions exhibited limited solubility in ethanol, unlike those with Br anions.
- At high LiBr concentrations (>2.5 wt.%), PIL particles dissolved from the surface, with [TFSA] anions replaced by Br anions.
- At low LiBr concentrations (<2.5 wt.%), internal domain formation preceded dissolution, attributed to osmotic pressure.
- Hollow PIL particles were successfully synthesized by exploiting this concentration-dependent solubility.
Conclusions:
- The solubility of poly(ionic liquid) particles is highly sensitive to the counter anion and solvent conditions.
- Anion exchange and osmotic pressure-driven domain formation are key mechanisms governing PIL particle dissolution.
- This study demonstrates a novel method for creating hollow poly(ionic liquid) structures with potential applications in drug delivery and catalysis.
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