▎ 摘　　要

NOVELTY - Multi-layer structure flexible film comprises multiple single-layer film stacked with high thermal conductive flexible graphene oxide-polymer material composite film, high oriented filling agent, and high thermal conductivity anisotropy and thermally driven three-level shape memory characteristics, including 20-40 wt.% graphene oxide, 30-40 wt.% sodium alginate, and 30-40 wt.% thermoplastic polymer material. USE - Used as the multi-layer structure flexible film. ADVANTAGE - The flexible film: has high thermal conductivity and three-level shape memory, high flexibility, and has high thermal conductivity anisotropy and thermally driven three-level shape memory performance; and is used widely. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the multi-layer structure flexible film comprising (a) adding sodium alginate to the dispersant, stirring for overnight to prepare 1-3 mg/ml sodium alginate dispersion, (b) adding graphene oxide to the dispersant, stirring for 2 hours, and ultrasonically treating for 30 minutes to prepare 1-3 mg/ml graphene oxide dispersion, (c) adding thermoplastic polymer material to dispersant, stirring for 0.5-1 hours, and ultrasonically treating for 5-10 minutes to prepare 1-3 mg/ml thermoplastic polymer material dispersion, (d) mixing sodium alginate dispersion, graphene oxide dispersion, and thermoplastic polymer material dispersion, stirring for 0.5-1 hour, and ultrasonically treating for 10 minutes to obtain 5-10 mg/ml graphene oxide-sodium alginate-thermoplastic polymer material mixture, (e) immersing polyimide hydrogel in a watch glass filled with silicone oil, then placing the watch glass on turntable with a rotation speed of 500 revolutions/second, pipetting 1000 mu l graphene oxide-sodium alginate-thermoplastic polymer material mixture, adding the mixture in a drop wise manner onto the surface of hydrogel immersed in silicone oil, (f) transferring the hydrogel with mixed solution to a watch glass filled with distilled water until the water submerges the surface of hydrogel for more than 30 seconds, taking out the hydrogel, using tweezers for peeling off the film formed on the surface of hydrogel, placing in a clean watch glass, and then placing in an oven at 60 degrees C for drying to obtain monolayer film, and (g) repeating the steps (e) and (f) for multiple times, and then stacking a multiple single-layer films sequentially.