Conductivity behavior and solid state NMR investigation of imidazolium-based polymeric ionic liquids

Novel proton-conducting anhydrous polymer electrolytes comprising imidazolium ionic liquid units in the polymeric structure have been synthesized. These polymeric ionic liquid electrolytes were doped with phosphoric acid to get Poly(AcIm-n)xH 3PO 4, where x is the number of moles of H 3PO 4 per poly...

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Bibliographic Details
Published in:Solid state ionics 2010-11, Vol.181 (35), p.1586-1595
Main Authors: Erdemi, Hamit, Akbey, Ümit, Meyer, Wolfgang H.
Format: Article
Language:English
Subjects:
Differential scanning calorimetry
Electrolytes
Imidazolium salts
Ionic conductivity
Ionic liquids
Nuclear magnetic resonance
Phosphoric acid
Polymer electrolyte
Solid state
Solid state NMR
Spacers
Spectra
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Summary:Novel proton-conducting anhydrous polymer electrolytes comprising imidazolium ionic liquid units in the polymeric structure have been synthesized. These polymeric ionic liquid electrolytes were doped with phosphoric acid to get Poly(AcIm-n)xH 3PO 4, where x is the number of moles of H 3PO 4 per polymer repeat unit and n is the number of alkyl spacers (–CH 2). Thermogravimetric analysis (TGA) illustrates that these materials are thermally stable up to about 200 °C. DSC results show the softening effect of the length of the spacers as well as phosphoric acid. Mechanical studies displayed the cross-linking of the samples which were also confirmed by solid state 31P CPMAS NMR spectra. The proton conductivity of the samples increases with x and reaches 10 −2 S cm −1 at 120 °C for both Poly(AcIm-2)2H 3PO 4 and Poly(AcIm-6)2H 3PO 4. The conductivity isotherms show that the proton transport in acid-doped polymeric ionic liquids obeys VTF behavior.
ISSN:0167-2738
1872-7689
DOI:10.1016/j.ssi.2010.08.018