title: Frictional dissipation and interfacial glass transition of polymeric solids.
abstract: We present single contact friction experiments between a glassy polymer and smooth silica substrates grafted with alkylsilane layers of different coverage densities and morphologies. This allows us to adjust the polymer-substrate interaction strength. We find that, when going from weak to strong interaction, the response of the interfacial junction where shear localizes evolves from that of a highly viscous threshold fluid to that of a plastically deformed glassy solid. This we analyze as resulting from an interaction-induced "interfacial glass transition" helped by pressure.
authors.affiliation: Institut des Nanosciences de Paris, UMR 7588 CNRS-Université Paris 6, 140 rue de Lourmel, 75015 Paris, France. bureau@insp.jussieu.fr
authors.forename: Lionel
authors.initials: L
authors.lastname: Bureau
authors.forename: Christiane
authors.initials: C
authors.lastname: Caroli
authors.forename: Tristan
authors.initials: T
authors.lastname: Baumberger