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Decoupling of ionic conductivity from structural dynamics in polymerized ionic liquids.

J R Sangoro1, C Iacob, A L Agapov

  • 1Department of Chemical & Biomolecular Engineering, University of Tennessee, Knoxville, Tennessee 37996-2200, USA. jsangoro@utk.edu.

Soft Matter
|April 11, 2014
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Summary
This summary is machine-generated.

Ionic liquids (ILs) show decoupled charge transport and structural dynamics when polymerized. Polymerized ILs exhibit significantly higher conductivity than their non-polymerized counterparts, especially near glass transition temperatures.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Polymer Science

Background:

  • Ionic liquids (ILs) are salts that are liquid at low temperatures.
  • Understanding charge transport and structural dynamics is crucial for IL applications.
  • Polymerization can significantly alter IL properties.

Purpose of the Study:

  • To investigate charge transport and structural dynamics in low molecular weight and polymerized 1-vinyl-3-pentylimidazolium bis(trifluoromethylsulfonyl)imide ionic liquids.
  • To compare the behavior of non-polymerized and polymerized ILs.
  • To explain the observed decoupling of ionic conduction from structural dynamics.

Main Methods:

  • Broadband dielectric spectroscopy
  • Dynamic mechanical spectroscopy
  • Differential scanning calorimetry

Main Results:

  • Non-polymerized ILs show identical temperature dependence for dc conductivity and fluidity.
  • Polymerized ILs exhibit a significant decoupling of ionic conduction from structural dynamics.
  • The dc conductivity of polymerized ILs is four orders of magnitude higher than non-polymerized ILs at their glass transition temperatures.
  • Unusually high anion mobility in polymerized ILs contributes to enhanced conductivity.

Conclusions:

  • Polymerization leads to a remarkable decoupling of ionic conductivity from structural dynamics in ILs.
  • High anion mobility is key to the enhanced conductivity observed in polymerized ILs.
  • A physical explanation for this decoupling phenomenon is proposed.