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Experimental investigation of a polymer coating in sliding contact with skin-equivalent silicone rubber in an aqueous environment

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Author: Heide, E. van der · Lossie, C.M. · Bommel, K.J.C. van · Reinders, S.A.F. · Lenting, H.B.M.
Source:Tribology Transactions, 53, 1-6
Identifier: 462720
Keywords: Materials · boundary lubrication friction · water · coatings · friction reducing · Industrial Innovation · Fluid Mechanics Chemistry & Energetics · RMC - Responsive Materials & Coating · TS - Technical Sciences


A study on the effect of a brush coating of polyacrylic 20 acid (PAA) grafted with poly(ethylene glycol) (PEG) (PAAQ1 g-PEG) on friction was done for a sliding system that involves silicone skin L7350: a silicone rubber used by the Fédération Internationale de Football Association (FIFA) for the determination of skin–surface friction in combination with artificial 25 grass. Friction experiments were carried out using a reciprocating flat-on-flat test setup with the selected brush coating and compared with PAA-coated and fluoroalkane-coated samples. The experiments were focused on the effect of water. Results for the coatings tested at dry conditions showed a coefficient 30 of friction above 1. Effective lubrication by water was able to reduce friction to a coefficient of friction below 0.01 at low sliding velocities. The results are currently used to further develop low-friction products for sliding interactions with human skin; for example, artificial grass and possibly medical textiles.