Influence of the molecular level structure of polyethylene and polytetrafluoroethylene on their tribological response

Patrick Y. Chiu, Peter R. Barry, Scott S. Perry, W. Gregory Sawyer, Simon R. Phillpot, Susan B. Sinnott

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Crosslinks occur in polymers following irradiation and are used in computational simulations to mimic the effects of chain tangling. Here, the effect of crosslink density on the tribological behavior of atomic-scale models of polyethylene and polytetrafluoroethylene is determined using classical molecular dynamics simulations. In the simulations, oriented crosslinked surfaces are slid in different directions over a range of applied normal loads. The results indicate that, at the same normal load, the friction force increases with increased crosslink density. In addition, the influence of randomized versus ordered crosslinking on the simulated tribological behavior is investigated. Finally, the influence of crosslink density on the simulated wear mechanisms of polyethylene and polytetrafluoroethylene is elucidated. The results have important implications for the atomic-scale modeling of friction at the interfaces of polymers that have been irradiated or contain entangled chains.

Original languageEnglish (US)
Pages (from-to)193-201
Number of pages9
JournalTribology Letters
Volume42
Issue number2
DOIs
StatePublished - May 1 2011

Fingerprint

polytetrafluoroethylene
Polytetrafluoroethylene
Polyethylene
Polytetrafluoroethylenes
Polyethylenes
polyethylenes
Polymers
Friction
tangling
friction
Crosslinking
Molecular dynamics
simulation
Wear of materials
polymers
Irradiation
scale models
crosslinking
Computer simulation
molecular dynamics

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Chiu, Patrick Y. ; Barry, Peter R. ; Perry, Scott S. ; Sawyer, W. Gregory ; Phillpot, Simon R. ; Sinnott, Susan B. / Influence of the molecular level structure of polyethylene and polytetrafluoroethylene on their tribological response. In: Tribology Letters. 2011 ; Vol. 42, No. 2. pp. 193-201.
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Influence of the molecular level structure of polyethylene and polytetrafluoroethylene on their tribological response. / Chiu, Patrick Y.; Barry, Peter R.; Perry, Scott S.; Sawyer, W. Gregory; Phillpot, Simon R.; Sinnott, Susan B.

In: Tribology Letters, Vol. 42, No. 2, 01.05.2011, p. 193-201.

Research output: Contribution to journalArticle

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