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Effect of crosslinking on the microtribological behavior of model polymer brushes

Singh, M. K., Ilg, P., Espinosa-Marzal, R. M., Kroger, M. and Spencer, N. D. (2016) Effect of crosslinking on the microtribological behavior of model polymer brushes. Tribology Letters, 63 (2). 17. ISSN 1573-2711

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To link to this item DOI: 10.1007/s11249-016-0705-8

Abstract/Summary

Polymer brushes in good solvents are known to exhibit excellent tribological properties. We have modeled polymer brushes and their gels using a multibead-spring model and studied their tribological behavior via nonequilibrium molecular-dynamics (MD) simulations. Simulations of brush- against-wall systems were performed using an implicit solvent-based approach. Polymer chains were modeled as linear chains, randomly grafted on a planar surface. Quantities extracted from the simulations are the normal stress, shear stress and concentration profiles. We find that while an increase in the degree of crosslinking leads to an increase in the coefficient of friction, an increase of the length of crosslinker chains does the opposite. Effect of crosslinking can be understood in two ways: (i) there are fewer polymer chains in the outer layer as the degree of crosslinking increases to take part in brush-assisted lubrication, and (ii) crosslinked polymer chains are more resistant to shear than non-crosslinked ones.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
ID Code:65953
Publisher:Springer

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