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Issue 12, 2011
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Polyurethane/silver-nanocomposites with enhanced silver ion release using multifunctional invertible polyesters

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Abstract

Nano-silver composites with a thermoplastic polyurethane as the matrix were prepared by two different routes. Using the so-called in situ preparation, silver nanoparticles were obtained by a thermal reduction of silver acetate during melt mixing. In addition, a more sophisticated ex situpreparation method was developed. Here, the silver nanoparticles are synthesized in an invertible polyester resulting in much smaller particle sizes. The particles obtained are surrounded by the polyester cage, which stabilizes them with respect to agglomeration. Hence, an incorporation of those particles into a polymer melt with common techniques like extrusion leads to an even distribution. This is due to the fact that the invertible polyester and the polymer matrix are entirely miscible which was proven with DSC measurements. The silver ion release of the composites prepared was measured with anodic stripping voltammetry. At a constant weight percentage of silver in the polymer, the composite with the ex situsilver nanoparticles exhibits a silver ion release which is about two orders of magnitude higher than the release from the composite with the in situsilver nanoparticles. This observation is explained by the higher specific surface area of the smaller particles and a higher coefficient of diffusion for silver ions. A concentration of only 0.07 wt% silver nanoparticles, prepared with the ex situ method, exhibits a high enough release of silver ions to achieve antimicrobial properties.

Graphical abstract: Polyurethane/silver-nanocomposites with enhanced silver ion release using multifunctional invertible polyesters

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Publication details

The article was received on 15 Oct 2010, accepted on 17 Jan 2011 and first published on 14 Feb 2011


Article type: Paper
DOI: 10.1039/C0JM03487H
Citation: J. Mater. Chem., 2011,21, 4377-4383
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    Polyurethane/silver-nanocomposites with enhanced silver ion release using multifunctional invertible polyesters

    C. Triebel, S. Vasylyev, C. Damm, H. Stara, C. Özpınar, S. Hausmann, W. Peukert and H. Münstedt, J. Mater. Chem., 2011, 21, 4377
    DOI: 10.1039/C0JM03487H

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