Frictional properties of confined polymers

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

doi:10.1140/epje/i2008-10349-8

Frictional properties of confined polymers

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

Research output: Contribution to journal › Journal article › Research › peer-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 language	English
Journal	The European Physical Journal E: Soft Matter and Biological Physics
Volume	27
Issue number	1
Pages (from-to)	37-46
ISSN	1292-8941
DOIs	https://doi.org/10.1140/epje/i2008-10349-8
Publication status	Published - 2008

Keywords

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

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title = "Frictional properties of confined polymers",

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.",

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T1 - Frictional properties of confined polymers

AU - Sivebæk, Ion Marius

AU - Samoilov, Vladimir N

AU - Persson, Bo N J

PY - 2008

Y1 - 2008

N2 - 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.

AB - 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.

KW - LONG-RANGE ELASTICITY

KW - LUBRICATION FILMS

KW - TRANSITION

KW - SMOOTH

KW - SLIP

KW - SHEAR

KW - BEHAVIOR

KW - LAYERS

KW - PRESSURE

KW - CURVED SOLID-SURFACES

U2 - 10.1140/epje/i2008-10349-8

DO - 10.1140/epje/i2008-10349-8

M3 - Journal article

C2 - 19230226

SN - 1292-8941

VL - 27

SP - 37

EP - 46

JO - The European Physical Journal E: Soft Matter and Biological Physics

JF - The European Physical Journal E: Soft Matter and Biological Physics

IS - 1

ER -

Frictional properties of confined polymers

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Keywords

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