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Polymerizing ionic liquid cations slows dynamics and enhances heterogeneity. Anion transport remains coupled to polymer motion, differing from side-chain polymerized analogs.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Computational Chemistry

Background:

  • Ionic liquids (ILs) are salts with low melting points, finding applications in various fields.
  • Polymerized ionic liquids (PILs) offer enhanced mechanical properties and processability compared to conventional ILs.
  • Imidazolium-based ILs and PILs are extensively studied due to their unique properties.

Purpose of the Study:

  • To compare the structure and dynamics of a simple ionic liquid with a polymerized ionic liquid.
  • To investigate the effect of embedded imidazolium rings in the polymer backbone on ion transport.
  • To analyze the applicability of the Rouse model to describe the dynamics of charged polymer chains.

Main Methods:

  • Molecular dynamics (MD) simulations were employed to model and analyze the systems.
  • Structural properties, including radial distribution functions, were calculated.
  • Dynamical properties, such as diffusion coefficients and relaxation times, were determined.

Main Results:

  • Cation polymerization minimally impacted local structure but significantly slowed dynamics and increased heterogeneity.
  • Anion and polymerized cation diffusion coefficients differed, indicating single-ion conductor behavior.
  • Anion structural relaxation remained coupled to segmental polymer motion, even with differing diffusion rates.
  • Embedded imidazolium rings in PILs led to different anion association and transport mechanisms compared to pendant imidazolium rings.
  • The Rouse model adequately described lower Rouse modes but showed deviations for higher modes due to polycation-anion interactions.

Conclusions:

  • Polymerization of ionic liquids with backbone-embedded imidazolium rings influences dynamics and ion transport.
  • The findings highlight the distinct behavior of embedded versus pendant ionic groups in polymer electrolytes.
  • The Rouse model provides a useful but limited description of dynamics in strongly interacting charged polymer systems.