Frictional properties of confined polymers |
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Authors: | I M Sivebaek V N Samoilov B N J Persson |
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Institution: | (1) IFF, FZ-Jülich, 52425 Jülich, Germany;(2) Novo Nordisk A/S, Research and Development, DK-3400 Hillerod, Denmark;(3) Department of Mechanical Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark;(4) Physics Faculty, Moscow State University, 117234 Moscow, Russia |
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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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Keywords: | PACS" target="_blank">PACS 31 15 Xv Molecular dynamics and other numerical methods 62 20 Qp Friction tribology and hardness 68 35 Af Atomic scale friction |
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