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    Antibacterial polymeric coating based on polypyrrole and polyethylene glycol on a new alloy TiAlZr

    Year: 2012

    Journal: Progress in Organic coatings, 2012, 75 (4) pp 349-355, 20130115

    Authors: Camelia Ungureanu, Cristian Pirvu, Mihaela Mindroiu, Ioana Demetrescu

    Organizations: University Polytehnica of Bucharest, Faculty of Applied Chemistry and Materials Science, 1-7 Polizu, 011061 Bucharest, Romania

    In order to enhance properties of the polymer composite films, composite coatings based on polypyrrole (PPy) and polyethylene glycol (PEG), using various percentages of PEG (0.5%, 2%, 4%), were electrodeposited on a new titanium alloy electrode as insulating material. The structure of the coatings was investigated via infrared (FTIR) analysis, and the surface features were studied using contact angle determination, atomic force microscopy (AFM) and scanning electronic microscopy (SEM). When testing the antibacterial properties of the coatings, the best effect was found for the coating with 2% PEG concentration, which has hydrophilic character and small roughness. Such results are in concordance with mechanism of biomaterial–bacteria interaction which involves as factors affecting bacterial adhesion and growth an initial physicochemical interaction stage, where roughness and wettabilitty are factors promoting bacterial adhesion and biofilm deposition.For the 2% PEG concentration in composite, electrochemical tests type cyclic voltammetry, Tafel plots, and electrochemical impedance spectroscopy (EIS) indicated an increase of stability in comparison with the polymeric coating with PPy. The effect of PEG on stability and antibacterial properties of polymeric coating PPy/PEG on TiAlZr was characterized by varying the PEG concentration.