Aqueous friction behavior of swollen hydrophilic poly(ethylene glycol)-based polyurethane coatings
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Aqueous friction behavior of swollen hydrophilic poly(ethylene glycol)-based polyurethane coatings Peter T. M. Albers1,4, Jozua Laven1,2, Leendert G. J. van der Ven1, Rolf A. T. M. van Benthem1,3, Gijsbertus de With1,2,* , and A. Catarina C. Esteves1,* 1
Laboratory of Physical Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands 2 Laboratory of Materials and Interface Chemistry, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands 3 DSM Materials Science Center, Netherlands, P.O. Box 18, 6160, MD, Geleen, The Netherlands 4 Dutch Polymer Institute (DPI), P. O. Box 902, 5600 AX Eindhoven, The Netherlands
Received: 11 July 2020
ABSTRACT
Accepted: 16 November 2020
The macroscopic friction behavior of water-swollen cross-linked poly(ethylene glycol)-based polyurethane coatings (PEG-based PU coatings) with varying PEG precursor mass is measured against a glass counter surface. Experimental data such as the water uptake and the indentation modulus are used to calculate an accurate value for the molar mass between cross-links Mc, which, in turn, is used for the estimation of the actual coating mesh size n. The friction, swelling and indentation data obtained are used to successfully deduce an empirical model for the quantitative description of the aqueous friction behavior of these coatings depending on the mesh size of the coatings and the sliding velocity only.
Published online: 30 November 2020
Springer Science+Business
Media, LLC, part of Springer Nature 2020
Introduction Hydrophilic polymeric coatings are applied to substrates and devices to reduce protein adhesion and to minimize drag resistance and friction arising upon moving such a surface through an aqueous medium or against an immersed counter surface. Hereby, these coatings provide the substrate or device with lubricity [1, 2]. This lubricity is particularly important for bio-medical devices in dynamic contact with the
human body, in order to increase the patient’s comfort and to reduce the risk of device-associated infections due to tissue damage and protein adhesion [3–5]. The type of hydrophilic coating to coat bio-medical devices, such as catheters, is often a highly hydrated hydrogel coating, either covalently or non-covalently bonded to the substrate [1, 6]. A vast variety of hydrophilic polymers is available for the design of hydrogels [7, 8], of which the most commonly ones
Handling Editor: C. Barry Carter.
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https://doi.org/10.1007/s10853-020-05580-9
4486 used are poly(vinylpyrrolidone) (PVP) [9–12], poly(ethylene glycol) (PEG) [13–15], polysaccharides [16, 17] and co-polymers thereof [18–20]. These coatings are often applied via dip coating processes, with a subsequent polymerization step to graft the polymer layer to the substrate (or to a primer layer) or solely to increase the cross-link density of the polymer coating [1, 12, 13, 16].
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