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Segment diffusion and flip-flop spin diffusion in entangled polyethyleneoxide melts: A field-gradient NMR

Fischer1, Kimmich, Fatkullin

  • 1Sektion Kernresonanzspektroskopie, Universitat Ulm, 89069 Ulm, Germany.

Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics
|November 23, 2000
PubMed
Summary

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Nuclear magnetic resonance diffusometry reveals polyethyleneoxide chain dynamics. The tube/reptation model offers qualitative insights but yields inconsistent parameters for polymer properties like chain end-to-end distance.

Area of Science:

  • Polymer Physics
  • Materials Science
  • Physical Chemistry

Background:

  • Understanding polymer chain dynamics is crucial for predicting material properties.
  • Entangled polymer melts exhibit complex behaviors influenced by intermolecular interactions.
  • Previous work highlighted the impact of spin diffusion on NMR measurements.

Purpose of the Study:

  • To investigate chain dynamics in entangled polyethyleneoxide melts.
  • To quantitatively assess the influence of intermolecular flip-flop spin diffusion on NMR data.
  • To compare experimental findings with predictions from the Rouse and tube/reptation models.

Main Methods:

  • Fringe field nuclear magnetic resonance (NMR) diffusometry was employed.
  • Experimental data were analyzed accounting for intermolecular flip-flop spin diffusion.

Related Experiment Videos

  • NMR diffusometry results were compared with neutron-scattering data.

    • Main Results:

    • The Rouse model failed to explain the experimental data.
    • The tube/reptation model provided a qualitative description of chain dynamics.
    • Fitted parameters from the tube/reptation model were inconsistent with known polymer properties, particularly the mean squared chain end-to-end distance.

    Conclusions:

    • Nuclear magnetic resonance diffusometry is a powerful tool for studying polymer dynamics.
    • The tube/reptation model qualitatively describes entangled polymer melt dynamics but requires refinement.
    • Discrepancies in fitted parameters suggest limitations in the current application of the tube/reptation model for polyethyleneoxide.