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Research Article | Open Access

On the friction and adhesion hysteresis between polymer brushes attached to curved surfaces: Rate and solvation effects

Sissi de BEER1,2, G. Djuidjé KENMOÉ3, Martin H. MÜSER2( )
Materials Science and Technology of Polymers, MESA+ Institute for Nanotechnology, University of Twente, P. O. Box 217, 7500 AE Enschede, the Netherlands
Jülich Supercomputing Centre Institute for Advanced Simulation FZ Jülich, 52425 Jülich, Germany
Department of Physics, Laboratory of Mechanics Faculty of Science, University of Yaoundé, P. O. Box 812, Yaoundé, Cameroon
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Abstract

Computer simulations of friction between polymer brushes are usually simplified compared to real systems in terms of solvents and geometry. In most simulations, the solvent is only implicit with infinite compressibility and zero inertia. In addition, the model geometries are parallel walls rather than curved or rough as in reality. In this work, we study the effects of these approximations and more generally the relevance of solvation on dissipation in polymer-brush systems by comparing simulations based on different solvation schemes. We find that the rate dependence of the energy loss during the collision of brush-bearing asperities can be different for explicit and implicit solvent. Moreover, the non-Newtonian rate dependences differ noticeably between normal and transverse motion, i.e., between head-on and off-center asperity collisions. Lastly, when the two opposing brushes are made immiscible, the friction is dramatically reduced compared to an undersaturated miscible polymer-brush system, irrespective of the sliding direction.

Keywords

polymer brushesbiomimetic materialsmolecular dynamics simulation

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Friction
Volume 3 Issue 2,
June 2015
Pages 148-160
DOI: 10.1007/s40544-015-0078-2
Cite this article:
BEER Sd, KENMOÉ GD, MÜSER MH. On the friction and adhesion hysteresis between polymer brushes attached to curved surfaces: Rate and solvation effects. Friction, 2015, 3(2): 148-160. https://doi.org/10.1007/s40544-015-0078-2

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Received: 27 January 2015
Revised: 06 March 2015
Accepted: 09 March 2015
Published: 30 June 2015
© The author(s) 2015

This article is published with open access at Springerlink.com

Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and source are credited.
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