Preparation and characterization of sodium alginate-nano-ZnO composite film
In order to improve the performance of sodium alginate film and endow it with certain antibacterial activity,a composite packaging film with dual functions of antibacterial and UV resistance was prepared by using sodium alginate as the film-forming substrate and adding different contents of nano-ZnO as antibacterial and UV resistant substances.The structure of the composite film was characterized by using UV spectroscopy,X-ray diffraction patterns,and the mechanical properties,moisture resistance,and optical properties of the composite film were tested and analyzed.The results show that the addition of nano-ZnO did not change the structure of sodium alginate film.The composite film has strong UV resistance and the nano-ZnO has good compatibility with sodium alginate.The antibacterial test found that the composite film has antibacterial property,and its antibacterial effect on S.aureus is stronger than that of E coli.The addition of nano-ZnO improves the mechanical properties and moisture resistance of the composite film.When the nano-ZnO content is 5%,it has a maximum tensile strength of 17.13 MPa and a minimum water vapor transmission coefficient of 8.05×10-11 g/(m·s·Pa).ALG-5%ZnO is the composite film with the best ratio.The research provides a reference for the application of nano-ZnO in the field of packaging film.
sodium alginatenano-ZnOUV resistantantibacterialdouble function
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