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Elaboration de surfaces biocides contenant des nanoparticules d’argent

Abstract : Two environment and human-friendly processes were developed to synthesize polyurethane-silver (PU-Ag) nanocomposites having biocide surfaces able preventing the microbial colonization.The first one, called ex-situ process, consists in incorporating a silver nanoparticles aqueous dispersion during the synthesis process of polyurethane, which is itself carried out in aqueous dispersion. In this case, the chemical reduction of silver ions under microwaves and in the presence of polyethyleneglycol was particularly developed with the aim to chemically incorporate the PEG in the PUchains. For the second process, silver ions dispersed inside a PU matrix were photochemically reduced in situ.The obtained materials exhibit a homogeneous dispersion of silver nanoparticles with small diameter (from 5 to 50 nm) without marked modification of the intrisic physomchemical properties of the PU. Lastly, the antibacterial properties of the surfaces aginst Pseudomonas aeruginosa and Enterococcus faecalis were confirmed.
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Issam Mtimet. Elaboration de surfaces biocides contenant des nanoparticules d’argent. Autre. INSA de Rouen, 2011. Français. ⟨NNT : 2011ISAM0019⟩. ⟨tel-00661304⟩

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