title: Frictional rheology of a confined adsorbed polymer layer.
abstract: The sliding dynamics of a confined adsorbed polymer layer is investigated at the nanoscale. A combined mechanical and physical approach is used to model the rheology and structure of the adsorbed layer. The confinement at short distances governs the nanotribological behavior of the polymer layer formed close to the surface. It appears that the Amontons' proportionality between frictional and normal stresses does not hold here: the higher the contact pressure, the lower the friction. Besides, the sliding stress is strongly dependent on the velocity: it increases with the sliding velocity. Using a model based on the kinetics of formation and rupture of adhesive bonds between the two shearing surfaces theoretically accounts for the behavior of this system. This approach allows us to correlate the frictional properties to the molecular organization on the surfaces.
authors: Laboratoire de Tribologie et Dynamique des Systèmes-UMR 5513 CNRS/Ecole Centrale de Lyon, 36 avenue Guy de Collongue, 69134 Ecully Cedex, France. juliette.cayer-barrioz@ec-lyon.fr
authors: Juliette
authors: J
authors: Cayer-Barrioz
authors: Denis
authors: D
authors: Mazuyer
authors: André
authors: A
authors: Tonck
authors: Elaine
authors: E
authors: Yamaguchi