Volume 69, Number 6, March 2005
|Page(s)||971 - 977|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||23 February 2005|
Sliding friction between an elastomer network and a grafted polymer layer: The role of cooperative effects
Laboratoire de Physique de la Matière Condensée, FR 2844 du CNRS Collège de France - 11 place Marcelin Berthelot, 75231 Paris Cedex 05, France
Accepted: 24 January 2005
We study the friction between a flat solid surface where polymer chains have been end-grafted and a cross-linked elastomer at low sliding velocity. The contribution of isolated grafted chains' penetration in the sliding elastomer has been early identified as a weakly velocity-dependent pull-out force. Recent experiments have shown that the interactions between the grafted chains at high grafting density modify the friction force by grafted chain. We develop here a simple model that takes into account those interactions and gives a limit grafting density beyond which the friction no longer increases with the grafting density, in good agreement with the experimental data.
PACS: 61.41.+e – Polymers, elastomers, and plastics / 68.08.-p – Liquid-solid interfaces
© EDP Sciences, 2005
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