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    Polyurethane-Based Coatings with Promising Antibacterial Properties

    Year: 2020

    Journal: Materials, Volume 13, OCT

    Authors: Villani, Maurizio; Bertoglio, Federico; Restivo, Elisa; Bruni, Giovanna; Iervese, Stefano; Arciola, Carla Renata; Carulli, Francesco; Iannace, Salvatore; Bertini, Fabio; Visai, Livia

    Organizations: Regione Lombardia Project "Piattaforma tecnologica per lo sviluppo di sonde innovative in ambito biomedicale" [244356]; Italian Ministry of Education, University and Research (MIUR)Ministry of Education, Universities and Research (MIUR); "5 per mille" research grant

    Keywords: silver nanoparticles; thermoplastic polyurethane (TPU); waterborne polyurethane (WPU); coatings; bactericidal surfaces

    In coatings technology, the possibility of introducing specific characteristics at the surface level allows for the manufacture of medical devices with efficient and prolonged antibacterial properties. This efficiency is often achieved by the use of a small amount of antibacterial molecules, which can fulfil their duty while limiting eventual releasing problems. The object of this work was the preparation and characterization of silver, titanium dioxide and chitosan polyurethane-based coatings. Coatings with the three antibacterials were prepared using different deposition techniques, using a brush or a bar coater automatic film applicator, and compared to solvent casted films prepared with the same components. For silver containing materials, an innovative strategy contemplating the use and preparation of silver nanoparticles in a single step-method was employed. This preparation was obtained starting from a silver precursor and using a single compound as the reducing agent and stabilizer. Ultraviolet-visible spectroscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy, contact angle measurements and adhesion test experiments were used to characterize the prepared coatings. Promising antibacterial properties, measured via direct and indirect methods, were registered for all the silver-based materials.
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