Effect of crosslinking on the microtribological behavior of model polymer brushesSingh, M. K., Ilg, P. ORCID: https://orcid.org/0000-0002-7518-5543, 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
It is advisable to refer to the publisher's version if you intend to cite from this work. See Guidance on citing. To link to this item DOI: 10.1007/s11249-016-0705-8 Abstract/SummaryPolymer 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.
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