479517 Effect of Anion on Ion Transport through Surface-Tethered Poly(Ionic Liquid) Films

Monday, November 14, 2016
Grand Ballroom B (Hilton San Francisco Union Square)
Maxwell W. Matson, Ian G. Njoroge and G. Kane Jennings, Chemical and Biomolecular Engineering, Vanderbilt University, Nashville, TN

Ionic liquids (ILs) are organic salts with large, asymmetric cations that are liquid at or below 100 °C. They possess a bevy of interesting properties including high ionic conductivities, negligible vapor pressure, inflammability, and good chemical stability. Poly(Ionic Liquids) (PILs) are polymers with the ionic liquid moiety covalently attached to the polymeric backbone. PILs offer an enhancement in the mechanical durability and process-ability of ILs. We investigated the effect of the anion on the ion transport properties of a PIL film. The PIL consisted of the cation, 1-norbornylmethylene-3-dimethylimidazolium, and various anions that could be readily exchanged into the film. The PIL was bound to the substrate via surface-initiated ring-opening metathesis polymerization. Polarization modulation infrared reflectance-absorption spectroscopy was utilized to confirm the identity of the anion present in the film. The impedance properties of the film were characterized by electrochemical impedance spectroscopy (EIS). The ion transport properties through the film were tuned by varying the anion present in the film. The film resistance of an individual film to ion transport could be varied from over 9 kΩ∙cm2 to a resistance lower than the solution resistance and as such not observable in the EIS spectra by modulating the film anion. The effect of the supporting electrolyte cation was determined to have a minor role in film impedance properties.

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