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Related Experiment Videos

Sliding friction at a rubber/brush interface.

Lionel Bureau1, Liliane Léger

  • 1Laboratoire de Physique des Fluides Organisés, UMR 7125 Collège de France-CNRS, 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France. lionel.bureau@college-de-france.fr

Langmuir : the ACS Journal of Surfaces and Colloids
|June 23, 2005
PubMed
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Friction arises from poly(dimethylsiloxane) (PDMS) chains pulling out from a network. This study quantifies chain pullout, confirming models of slippage at interfaces.

Area of Science:

  • Materials Science
  • Tribology
  • Polymer Physics

Background:

  • Friction at polymer interfaces is crucial for material performance.
  • Understanding dissipative mechanisms in polymer networks is key to controlling friction.
  • Poly(dimethylsiloxane) (PDMS) is a widely used elastomer with unique viscoelastic properties.

Purpose of the Study:

  • To investigate the contribution of chain pullout to friction in a poly(dimethylsiloxane) (PDMS) network sliding on end-tethered PDMS chains.
  • To systematically study the velocity dependence of friction stress and its relation to grafting density and molecular weight.
  • To validate theoretical models of slippage at polymer network/brush interfaces.

Main Methods:

  • Sliding friction experiments at low velocities.

Related Experiment Videos

  • Systematic variation of grafting density and molecular weight of tethered PDMS chains.
  • Analysis of friction stress as a function of sliding velocity.

    • Main Results:

    • Direct evidence for the contribution of chain pullout to interfacial friction.
    • Friction stress shows clear dependence on sliding velocity, grafting density, and molecular weight.
    • Experimental data semiquantitatively confirms the proposed arm retraction relaxation mechanism.

    Conclusions:

    • Chain pullout is a significant dissipative process governing friction at the PDMS network/brush interface.
    • The study validates models describing slippage through arm retraction relaxation.
    • This work provides insights into controlling friction in polymer-based systems.