Frictional properties of confined polymers

Ion Marius Sivebæk, Vladimir N Samoilov, Bo N J Persson

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We present molecular dynamics friction calculations for confined hydrocarbon solids with molecular lengths from 20 to 1400 carbon atoms. Two cases are considered: a) polymer sliding against a hard substrate, and b) polymer sliding on polymer. In the first setup the shear stresses are relatively independent of molecular length. For polymer sliding on polymer the friction is significantly larger, and dependent on the molecular chain length. In both cases, the shear stresses are proportional to the squeezing pressure and finite at zero load, indicating an adhesional contribution to the friction force. The friction decreases when the sliding distance is of the order of the molecular length indicating a strong influence of molecular alignment during run-in. The results of our calculations show good correlation with experimental work.
Original languageEnglish
JournalThe European Physical Journal E: Soft Matter and Biological Physics
Volume27
Issue number1
Pages (from-to)37-46
ISSN1292-8941
DOIs
Publication statusPublished - 2008

Keywords

  • LONG-RANGE ELASTICITY
  • LUBRICATION FILMS
  • TRANSITION
  • SMOOTH
  • SLIP
  • SHEAR
  • BEHAVIOR
  • LAYERS
  • PRESSURE
  • CURVED SOLID-SURFACES

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