Abstract
Polyvinyl alcohol/oregano oil/graphene oxide antibacterial composite film was prepared from PVA and GO by adding OEO as the antibacterial agent. The effect of different OEO contents on the properties of the composite film was studied. The results showed that the OEO improved the performance of the composite film. With the increase of OEO content, the thicknesses were increased, the mechanical properties were improved, and the antibacterial activities were increased. The performances of the film with 1% OEO were the best. The tensile fracture elongation and the tensile strength were 249% and 20.760 MPa, respestively. The diameter of the antibacterial ring of E. coli and L. monocytogenes was 11.70 mm and 12.61 mm, respectively. FTIR revealed that there were chemical bonds among PVA, GO and OEO. SEM showed that OEO made the surface of the composite film smoother. TGA showed that OEO did not affect the coke yield of composite films. DSC indicated that OEO reduced the exothermicity of composite films. The antibacterial properties of natural essential oils were taken advantage of to make the antibacterial composite films, which was beneficial to expand the use of essential oils in packaging films, and provides a reliable reference for other researchers.
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