The DOI matches its Crossref record; 35 of the 35 references it cites were found in a registry or an index.
Relative Chemical Stability of Imidazolium-Based Alkaline Anion Exchange Polymerized Ionic Liquids
Abstract
We thoroughly investigate and quantify the chemical stability of an imidazolium-based alkaline anion exchange polymerized ionic liquid (PIL), poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazolium hydroxide) (poly(MEBIm-OH), over a broad range of humidities, temperatures, and alkaline concentrations using the combined techniques of electrochemical impedance spectroscopy and nuclear magnetic resonance spectroscopy. High chemical stability was observed under dry conditions (10% RH) at 30 °C, humid and saturated conditions up to 80 °C, and even in mild alkaline conditions ([KOH] < 1 M) at 25 °C. Degradation was only observed under more vigorous conditions: dry conditions (10% RH) at 80 °C or at higher alkaline concentrations ([KOH] > 1 M). Under these conditions, we suggest an imidazolium ring-opening mechanism as the primary degradation pathway, based on a detailed analysis of the 1 H NMR spectra. Similar to poly(MEBIm-OH), other alkaline anion (carbonate (CO 3 2– ) and bicarbonate (HCO 3 – )) exchange PILs were also synthesized in this study via salt metathesis of the PIL precursor, poly(1-[(2-methacryloyloxy)ethyl]-3-butylimidazolium bromide) (poly(MEBIm-Br)). The thermal and ion conductive properties of each PIL in this study were characterized. The ionic conductivity of the hydroxide conducting PIL, poly(MEBIm-OH), was the highest of these PILs investigated at 9.6 mS cm –1 at 90% RH and 30 °C with an Arrhenius activation energy of 17.1 kJ mol –1 at 90% RH.
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Anion exchange membranes: Current status and moving forward
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Metadata
- Authors
- Ye, Y., & Elabd, Y. A.
- Venue
- Macromolecules
- Publisher
- American Chemical Society (ACS)
- Published
- 2011-10-17
- Volume
- 44
- Issue
- 21
- Pages
- 8494-8503
- ISSN
- 0024-9297 (ISSN-L)
- 1520-5835
- OpenAlex
- W2312754530
- Cited by
- 286
- References
- 35
- FWCI
- 11.27
- Type
- journal article
- Language
- en
- Open access
- closed
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