Antibacterial and physical properties of poly(vinyl chloride)-based film coated with ZnO nanoparticles.

摘要

Antibacterial and physical properties of PVC-based films coated with ZnO nanoparticles were investigated. ZnO-coated films treated by shaking for 10 h exhibited similar high antibacterial activity against Escherichia coli and Staphylococcus aureus as untreated ZnO-coated films, suggesting that the ZnO nanoparticles adhered very well to the plastic film. Antibacterial activity of ZnO-coated films against E. coli or S. aureus was improved by UV irradiation. Analysis of physical properties of ZnO-coated films revealed that the nano-ZnO particles exerted less impact on the tensile strength and elongation at break of the film. Impermeability to UV light was improved by the presence of ZnO nanoparticles, probably due to their ability to absorb UV light. Transmission of water through the ZnO-coated film decreased from 128 to 85 g/m2. 24 h, whereas the thickness of the film increased from 6.0 mum with increases in amounts of nano-ZnO particles in the coatings from 0 to 187.5 g/cm2. Results suggest that PVC film coated with nano-ZnO particles has the potential to be used as an active coating system for food packaging.