Frictional dissipation of polymeric solids vs interfacial glass transition

Details Frictional dissipation of polymeric solids vs interfacial glass transition Frictional dissipation of polymeric solids vs interfacial glass transition

2006-07-19

arxiv.org/abs/cond-mat/0607477v1

Phys. Rev. Lett. 97 (2006) 225501

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.97.225501

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 analyse as resulting from an interaction-induced ``interfacial glass transition'' helped by pressure.

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