| Antimicrobial materials (agents) are those materials capable of killing pathogenic microorganisms. Of all the different kinds of antimicrobial materials, the natural antimicrobial based materials are the most promising ones, cause of their multiple advantages over others. Comparing with other materials, they own better biocompatibility and biodegradability, along with their eco-friendly characters.In this study, we studied the antimicrobial properties of chitosan, and to make it better, we found a better way in enhancing its antimicrobial property. It is to blend another antimicrobial agent—tannin with chitosan. With tens of experiments, we got the most convenient method, by physical blending at room temperature, and room humidity. With the help of UV spectroscopy, we can conclude that tannin has been bonded to chitosan successfully. From XRD data, we can find that tannin has broken the crystal structure of chitosan. And SEM results show the well blending of tannin and chitosan. DSC data tell us that they have good compatibility between the two materials. So it is not wonder that the CS films can still behave well as usual. Different antimicrobial tests’results all suggest that they are good matches with stronger antimicrobial properties against both Gram positive and negative bacterials. Differnent experiments show the potential application of antimicrobial films as food packaging materials, antimicrobial coatings in metal, etc.What’s more, we also find new recipes for novel PVA/tannin films, to make PVA antimicrobial. As the chitosan/tannin systems, we also take different tests. And we can conclude that tannin has been bonded to PVA successfully, with PVA crystallinity changed a bit. PVA/Tannin films show homogenous and one single Tm. Mechanical propertities also show a pleasant one. All these signals tell us that PVA/Tannin has higher potential application in much broader platforms, such as packaging materials in food industry and antimicrobial fibers in clothing field. |
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