Formulation of epoxy–polyester powder coatings containing silver-modified nanoclays and evaluation of their antimicrobial properties
| Autor: | Rameesh Babu, Gordon Armstrong, Fathima Laffir, Tanushree Bala, Michael P. Ryan, R.J. Russell, Roibeard F. Thornton, Christopher Keely |
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| Rok vydání: | 2012 |
| Předmět: |
Polyester resin
chemistry.chemical_classification Nanocomposite Materials science Polymers and Plastics General Chemistry Epoxy engineering.material Condensed Matter Physics Antimicrobial Polyester chemistry.chemical_compound Montmorillonite chemistry Chemical engineering Coating visual_art Materials Chemistry visual_art.visual_art_medium engineering Wetting Composite material |
| Zdroj: | Polymer Bulletin. 68:1951-1963 |
| ISSN: | 1436-2449 0170-0839 |
| Popis: | Current interest in antimicrobial coatings is driven by an urgent need for more effective strategies to control microbial infection. In this study, antimicrobial nanoclays were prepared by ion-exchange of sodium montmorillonite (MMT) with silver ions which have been previously reported to exhibit biocidal activity. The extent of ion-exchange achieved was estimated by X-ray photoelectron spectroscopy. The silver-modified nanoclay (AgMMT) fully inhibited growth of Gram-negative bacterium Escherichia coli DH5α (E. coli) over 24 h; annealing AgMMT under typical conditions used to prepare polymer composites did not reduce its antimicrobial efficacy. However, powder coatings of AgMMT dispersed in epoxy/polyester resin exhibited no antimicrobial effect on E. coli. This is believed to be caused by poor wetting of the polymer coating, which restricted the diffusion of silver ions from the coating. |
| Databáze: | OpenAIRE |
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