Aqueous friction behavior of swollen hydrophilic poly(ethylene glycol)-based polyurethane coatings

The macroscopic friction behavior of water-swollen cross-linked poly(ethylene glycol)-based polyurethane coatings (PEG-based PU coatings) with varying PEG precursor mass was measured against a glass counter surface.

Organic additives initially improved the interfacial stability of titanium-treated substrates.  Image source: mohamed Hassan - Pixabay (symbol image).

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 ξ.

Friction, swelling and indentation data

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.

The study has been published in Journal of Materials Science, Volume 56 (2021).

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