Polyurethane-Based Coatings with Promising Antibacterial Properties

Abstract

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.

Silver- and Zinc-Decorated Polyurethane Ionomers with Tunable Hard/Soft Phase Segregation

“…Conventional approaches to obtain antimicrobial polymers based on silver or other metals are based on either the deposition of a metallic layer on a polymer surface [ 45 ] or entrapping metal nanoparticles [ 46 ]. In contrast, in this study, the coordination of polymers was obtained by simply dipping the synthesized PU ionomers sodium salts in an aqueous solution containing either silver or zinc salts.…”

Preparation of polyurethane coating formulation based on dihydropyridine derivatives as an insecticide and antifungal additives for surface coating applications

“…PU-based coatings and films were successfully prepared and investigated. 31 The preparation of novel antimicrobial coating materials based on polyethyleneimine (PEI) and study of their structure À activity relationship and the mechanism of action at the molecular level. 32 The effectiveness of these polymers as the antimicrobial coating was also evaluated along with the conventional polymers and commercial paint.…”

Tailoring Mesoporous Silica-Coated Silver Nanoparticles and Polyurethane-Doped Films for Enhanced Antimicrobial Applications

“…This includes the specific functionalization of the AgNPs or custom construction of TPU matrices blending with other polymers or molecules possessing functional groups that enhance interaction with the AgNPs. Additionally, methods such as the direct reduction of silver salts within the polymer matrix are employed, among other approaches [ 43 , 44 , 45 , 46 ].…”