Journal Article

PreJuSER-2766

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Frictional properties of confined polymers

Sivebaek, I. M. ; Samoilov, V. N. ; Persson, B. N. J.FZJ*

2008
Springer Berlin

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Please use a persistent id in citations: doi:10.1140/epje/i2008-10349-8

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.

Keyword(s): Carbon: chemistry (MeSH) ; Computer Simulation (MeSH) ; Elasticity (MeSH) ; Equipment Design (MeSH) ; Friction (MeSH) ; Models, Theoretical (MeSH) ; Physics: methods (MeSH) ; Polymers: chemistry (MeSH) ; Pressure (MeSH) ; Stress, Mechanical (MeSH) ; Surface Properties (MeSH) ; Polymers ; Carbon ; J

Note: A part of the present work was carried out in frames of the ESF program "Nanotribology (NATRIBO)". Two of the authors (I.M.S. and V.N.S.) acknowledge support from IFF, FZ-Julich, hospitality and help of the staff during their research visits.

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Contributing Institute(s):

1. Quanten-Theorie der Materialien (IFF-1)

Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2008

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