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Quantifying and controlling the cation uptake upon hydrated ionic liquid-induced swelling of polyelectrolyte
1Institute of Physical Chemistry, University of Muenster, Corrensstr. 28/30, 48149 Münster, Germany. schoenho@uni-muenster.de and NRW Graduate School of Chemistry, University of Muenster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany.
Soft Matter
|February 11, 2017
Summary
Researchers quantified ionic liquid cation uptake in polyelectrolyte multilayers (PEMs). Post-preparative pH adjustments allow control over cation incorporation, enabling tailored ion-conductive polymer gel films.
Area of Science:
- Materials Science
- Polymer Chemistry
- Electrochemistry
Background:
- Controlling ion uptake in polyelectrolyte multilayers (PEMs) is crucial for applications.
- Ionic liquids offer unique properties for material modification.
Purpose of the Study:
- Quantify the incorporation of 1,3-bis(cyanomethyl)imidazolium chloride cations into PEMs.
- Investigate the influence of solution concentration and post-preparative charge manipulation on ion uptake.
- Explore pH-induced charge control for tailored ion concentration in PEMs.
Main Methods:
- Assembly of three PEM systems: PSS/PDADMAC, PSS/PAH, and PAA/PDADMAC.
- Attenuated total reflection infrared spectroscopy (ATR-IR) to quantify cation concentration.
- Post-preparative pH treatment to manipulate film charge balance.
Main Results:
- Cation concentration in PEMs ranged from 30% to 100% of bulk solution concentration.
- Ion uptake scaled as PAA/PDADMAC > PSS/PDADMAC > PSS/PAH.
- Post-preparative charge manipulation, particularly pH stimuli, effectively controlled cation incorporation.
Conclusions:
- Post-preparative pH treatment is a viable strategy to control cation concentration in PEMs.
- This method can be used to create ion-conductive polymer gel films with desired ion concentrations.
- Findings advance the design of functional polymer materials for ion transport applications.
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