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Characteristics of Precipitation-formed Polyethylene Glycol Microgels Are Controlled by Molecular Weight of Reactants
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A comparative study of polyethylene oxide (PEO) using different coarse-graining methods.

Sanjeet Kumar Singh1, Diego Pantano1, Arnaud Prebe1

  • 1Department of Chemistry, Université de Sherbrooke, Sherbrooke, Quebec J1K 2R1, Canada.

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Summary

Comparing simulation methods for polyethylene oxide (PEO), SPICA forcefield best replicates atomistic structural and dynamic properties, crucial for battery material development.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Polymer Science

Background:

  • Polyethylene oxide (PEO) is vital for battery applications due to its processability and ionic conductivity.
  • Understanding PEO properties across different simulation scales is key to enhancing its performance.

Purpose of the Study:

  • To comparatively analyze the molecular structure, thermodynamics, and dynamics of PEO.
  • To evaluate the accuracy of three coarse-grained (CG) simulation methods against all-atom (AA) simulations.

Main Methods:

  • Utilized three CG forcefields: MARTINI, SPICA, and an IBI-derived potential.
  • Performed all-atom (AA) simulations using the pcff+ forcefield.
  • Validated simulated densities and solubility parameters against literature data.

Main Results:

  • All simulations showed good density alignment with literature; AA simulations accurately predicted solubility parameters.
  • SPICA forcefield demonstrated superior accuracy in reproducing PEO's intermolecular structure (RDF), radius of gyration (Rg), and end-to-end distance (Re).
  • IBI showed moderate structural accuracy, while MARTINI had limitations in representing structural properties; SPICA also yielded enhanced dynamics.

Conclusions:

  • SPICA forcefield emerges as the most reliable CG method for simulating PEO's structural and dynamic properties.
  • This study provides valuable insights for selecting appropriate simulation techniques to optimize PEO-based battery materials.