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Communication: Relationship between solute localization and diffusion in a dynamically constrained polymer system.

David M Saylor1, Sudi Jawahery1, Joshua S Silverstein1

  • 1Center for Devices and Radiological Health, FDA, Silver Spring, Maryland 20993, USA.

The Journal of Chemical Physics
|July 25, 2016
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Summary
This summary is machine-generated.

We found a linear link between dynamic localization (Debye-Waller factor) and solute self-diffusivity in polymers. This relationship helps rapidly assess diffusion in glass formation.

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Area of Science:

  • Materials Science
  • Polymer Physics
  • Chemical Engineering

Background:

  • Dynamic localization, quantified by the Debye-Waller factor (⟨u(2)⟩), describes atomic/molecular motion within materials.
  • Solute self-diffusivity (D) is crucial for understanding transport phenomena in polymers, impacting material properties and processing.
  • The glass transition regime in polymers presents complex diffusion behaviors that are challenging to model.

Purpose of the Study:

  • To investigate the relationship between dynamic localization and solute self-diffusivity in polymer systems.
  • To explore the applicability of the Debye-Waller factor as a predictor of diffusion coefficients.
  • To establish a predictive model for diffusion across a wide range of polymer dynamics.

Main Methods:

  • Atomistic molecular dynamics simulations were employed to model polymer systems at the atomic level.
  • Vapor sorption experiments were conducted to experimentally determine diffusion coefficients.
  • Statistical analysis was used to correlate the Debye-Waller factor with measured self-diffusivity.

Main Results:

  • A clear linear relationship was observed between the natural logarithm of diffusivity (lnD) and the inverse of the Debye-Waller factor (1/⟨u(2)⟩).
  • This linear correlation spans over four orders of magnitude of diffusivity, covering a significant portion of the polymer glass formation regime.
  • The findings are consistent with theoretical predictions based on Langevin dynamics in periodically varying potential fields.

Conclusions:

  • Dynamic localization, as measured by the Debye-Waller factor, is a strong indicator of solute self-diffusivity in polymers.
  • The established linear relationship offers a potentially rapid method for assessing diffusion characteristics.
  • This work provides a new perspective on understanding and predicting diffusion in complex polymer systems.