Effect of crosslinking on the microtribological behavior of model polymer brushes

Article English OPEN
Singh, Manjesh K. ; Ilg, Patrick ; Espinosa-Marzal, Rosa M. ; Kroger, Martin ; Spencer, Nicholas D. (2016)
  • Publisher: Springer
  • Related identifiers: doi: 10.1007/s11249-016-0705-8
  • Subject:
    mesheuropmc: macromolecular substances | technology, industry, and agriculture

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.
  • References (62)
    62 references, page 1 of 7

    Napper, D.H.: Polymeric stabilization of colloidal dispersions. London ; New York : Academic Press (1983).

    Hucknall, A., Simnick, A.J., Hill, R.T., Chilkoti, A., Garcia, A., Johannes, M.S., Clark, R.L., Zauscher, S., Ratner, B.D.: Versatile synthesis and micropatterning of nonfouling polymer brushes on the wafer scale. Biointerphases. 4, FA50-7 (2009).

    Auroy, P., Auvray, L., Leger, L.: Characterization of the Brush Regime for Grafted Polymer Layers at the Solid-Liquid Interface. Phys. Rev. Lett. 66, 719-722 (1991).

    Lee, S., Spencer, N.D., Erdemir, A., Martin, J.M.: Achieving ultralow friction by aqueous, brush-assisted lubrication. Superlubricity. 365-396 (2007).

    Li, A.: Structure-property Relationships of Surface-grafted Polymeric Architectures: From Ultra-Thin Films To Quasi-3D Polymer Assemblies. PhD Thesis. ETH Zurich (2013).

    Dunn, A.C., Sawyer, W.G., Angelini, T.E.: Gemini Interfaces in Aqueous Lubrication with Hydrogels. Tribol. Lett. 54, 59-66 (2014).

    Freeman, M.E., Furey, M.J., Love, B.J., Hampton, J.M.: Friction, wear, and lubrication of hydrogels as synthetic articular cartilage. Wear. 241, 129-135 (2000).

    Irfachsyad, D., Tildesley, D., Malfreyt, P.: Dissipative particle dynamics simulation of grafted polymer brushes under shear. Phys. Chem. Chem. Phys. 4, 3008-3015 (2002).

    Chen, M., Briscoe, W.H., Armes, S.P., Klein, J.: Lubrication at Physiological Pressures by Polyzwitterionic Brushes. Science. 323, 1698-1701 (2009).

    Klein, J., Perahia, D., Warburg, S.: Forces between polymer-bearing surfaces undergoing shear. Nature. 352, (1991).

  • Metrics
    0
    views in OpenAIRE
    0
    views in local repository
    53
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    Central Archive at the University of Reading - IRUS-UK 0 53
Share - Bookmark