Dresden 2017 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 29: Polymer Networks and Dynamics III: Mechanical Properties

CPP 29.5: Vortrag

Dienstag, 21. März 2017, 15:00–15:15, ZEU 250

Friction between ring polymer brushes — •Jaroslaw Paturej1,2 and Aykut Erbas31Leibniz Institute of Polymer Research Dresden, 01069 Dresden, Germany — 2Institute of Physics, University of Szczecin, 70451 Szczecin, Poland — 3Department of Materials Science and Engineering, Northwestern University, Evanston, IL 60208, USA

Friction between ring polymer brush bilayers sliding past each other at melt densities is studied using extensive coarse-grained molecular dynamics simulations and scaling arguments, and the results are compared to the friction between bilayers of linear polymer brushes. We show that for a velocity range spanning over three decades, the frictional forces measured for ring polymer brushes are smaller in comparison to the corresponding friction in the case of linear brushes. In the linear-force regime, the weak inter-digitation between ring brush layers as compared to linear brushes leads also to a lower number of binary collisions between the monomers from opposing brushes. At high velocities, where the thickness of the inter-digitation between bilayers is on the order of monomer size regardless of brush topology, stretched segments of ring polymers adopt the double-stranded conformation.

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