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Polyamide/silver antimicrobials: effect of crystallinity on the silver ion release

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Polyamide/silver (PA/Ag) composite materials are regarded as potential antimicrobials by virtue of their efficacy to release the Ag+ ions in an aqueous medium. The effects of the matrix crystallinity on the Ag+ ion release characteristics of PA/Ag composites are discussed. It is found that matrix crystallinity is very decisive for the silver ion releasing properties and hence the antimicrobial efficacy of silver‐based antimicrobial polyamides. The crystallinities of the composites were evaluated using differential scanning calorimetry. The silver ion release characteristics of these composites were measured by anode stripping voltammetry. Silver ion release was higher in systems possessing lower degrees of crystallinity. Water‐diffusion characteristics of the composites control the silver ion release. The effect of crystallinity on silver ion release rate depends on the time of soaking of the specimens in water. Copyright © 2005 Society of Chemical Industry
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Keywords: antimicrobial efficacy; crystallinity; polyamide; silver ion release

Document Type: Research Article

Affiliations: Institute of Polymer Materials, Friedrich-Alexander University Erlangen-Nuremberg, Martensstr 7, 91058 Erlangen, Germany

Publication date: August 1, 2005

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