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Investigating friction on a polymer bilayer revealed that energy dissipation occurs within the polystyrene (PS) underlayer, not just on the surface. This subsurface friction is linked to polymer relaxation modes near the glass-transition temperature.

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Area of Science:

  • Materials Science
  • Tribology
  • Polymer Physics

Background:

  • Understanding friction mechanisms is crucial for material design and performance.
  • Distinguishing between surface and subsurface energy dissipation in layered materials is challenging.
  • Polymer relaxation dynamics significantly influence tribological behavior.

Purpose of the Study:

  • To investigate sliding friction in a polymer bilayer system.
  • To differentiate surface friction from subsurface energy dissipation channels.
  • To elucidate the role of polymer relaxation in frictional energy dissipation.

Main Methods:

  • Friction Force Microscopy (FFM) was employed to study nanoscale friction.
  • Experiments were conducted on a silicon tip sliding against a polystyrene (PS) film capped with plasma polymer.
  • Friction measurements were systematically varied with sample temperature, scanning velocity, and applied load.

Main Results:

  • A nonlinear increase in friction was observed with applied load near the glass-transition temperature of the PS underlayer.
  • This behavior indicates significant frictional energy dissipation within the bulk of the polystyrene layer.
  • The observed time-temperature kinetics of energy dissipation align with known PS material properties.

Conclusions:

  • Frictional energy dissipation in the polymer bilayer is a combination of surface sliding on the capping layer and subsurface relaxation processes in the PS underlayer.
  • The study successfully identified and characterized subsurface dissipation channels in polymers using nanoscale friction.
  • The findings provide insights into the fundamental mechanisms governing friction and energy dissipation in polymer systems.