▎ 摘　　要

NOVELTY - Preparing a graphene oxide modified starch/chitosan composite packaging film, comprises (1) adding graphene oxide dispersion liquid to carboxymethyl cellulose solution, carrying out ultrasonic treatment, adding urea, stirring uniformly, adjusting the pH value to 9.0-9.5, heating up to 70-80℃ and reacting for 2-3 hours, then adjusting the pH value to 7.0-7.5 to obtain a modified graphene oxide small sheet uniform dispersion, and (2) adding resultant modified graphene oxide small sheet, polyvinylpyrrolidone, and chitosan solution to the gelatinized starch solution, stirring at 70-80℃ for 30-50 minutes, and then pouring, drying, cooling and taking out to obtain the final product. USE - The graphene oxide modified starch/chitosan composite packaging film is useful in preparing starch-based film (claimed), and food and medicine packaging material. ADVANTAGE - The film: is safe, environmentally friendly, economical, capable of blocking water vapor and air and shielding 93.5-96.2 % of ultraviolet radiation; has high mechanical strength, toughness, strong anti-ultraviolet ability, high transmittance, excellent antibacterial effect, water resistance, strong barrier air and water vapor permeability; ensure the content of the oxidation graphene of 0.008-0.01 wt.% of the substrate and prolonged service life.