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Area of Science:

  • Materials Science
  • Polymer Science
  • Surface Science

Background:

  • Polymer performance in composites, coatings, and adhesives depends on interfacial chain dynamics.
  • Molecular principles governing these dynamics at solid interfaces are not fully understood.

Purpose of the Study:

  • To directly map segment-level relaxation dynamics of isolated polystyrene chains on flat substrates.
  • To elucidate the molecular mechanisms controlling chain behavior at solid-polymer interfaces.

Main Methods:

  • Utilized time-resolved atomic force microscopy (TR-AFM) to observe chain dynamics in real space.
  • Employed molecular dynamics (MD) simulations for theoretical validation.
  • Conducted experiments with catechol-functionalized chains to assess generality.

Main Results:

  • Discovered significant spatial heterogeneity in chain relaxation, with segments exhibiting both temperature-accelerated and adsorption-hindered dynamics.
  • Demonstrated that interfacial coupling propagates these dynamics to neighboring chains.
  • Confirmed the coexistence of thermally activated and adsorption-driven relaxation processes via simulations.

Conclusions:

  • Established a real-space framework connecting interfacial structure to polymer chain dynamics.
  • Revealed isolated polymer chains on solids as nonequilibrium systems.
  • Provided insights for molecular-level design of adhesion and interfacial toughness in polymer-based materials.