Polyvinyl alcohol(PVA)is a new kind of green material,and the development of non-toxic and excellent optical and mechanical properties of PVA antibacterial packaging film can expand its application in the packaging field.The difficulty of preparing PVA antibacterial packaging films lies in selecting suitable antibacterial materials to solve the problems of difficult dispersion and compatibility with the substrate.In this study,non-toxic and safe Glyceryl Monocaprylate(GMC)was used as an antibacterial agent and glycerin/sorbitol was used as a plasticizer to prepare PVA packaging films.Firstly,the GMC was dissolved in glycerol and then mixed with water to form an emulsion antibacterial solution,and then added to the PVA film solution to prepare PVA packaging films.Its mechanical properties,optical properties,and oxygen permeability were investigated.The experimental results showed that when the amount of GMC is between 0.2mL and 0.3mL,the transmittal rate of PVA packaging films is more than 92%,the fog is less than 10%,the tensile strength is 211.485MPa,and the elongation at break is 140.41%,which has good optical and mechanical properties.The increase in GMC content has little effect on the oxygen transmission rate of PVA packaging films.Then,the PVA packaging films were characterized by a Fourier transform infrared spectrometer,scanning electron microscope,and differential scanning calorimeter.The experimental results showed that the addition of GMC make the peak of 3200cm-1 in the infrared spectrum of PVA packaging films significantly wider,and the content of hydroxyl(-OH)in the films increases.After the addition of GMC,the surface of PVA packaging films show a uniform distribution of antibacterial droplets,and with the increase of GMC content,the dispersion of GMC in the films decreases.The differential scanning calorimeter curve is compatible with GMC,PVA,and the compound plasticizer(glycerol/sorbitol).Finally,the antibacterial properties of PVA packaging films were tested.The results showed that adding GMC has a certain inhibitory effect on the growth and reproduction of Staphylococcus aureus,and the more GMC content,the more obvious the effect.
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