▎ 摘　　要

NOVELTY - Thermally conductive graphene-polymer composite film comprises 10-30 wt.% graphene, 35-45 wt.% nano-cellulose, and 35-45 wt.% polyethylene glycol. USE - The thermally conductive graphene-polymer composite film is used as a polymer matrix composite material and intelligent product (claimed). ADVANTAGE - The method is simple and easy to be industrialized. The composite film has flexibility, high lateral thermal conductivity, and thermally driven shape memory performance. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for the following: (1) a method for preparing the thermally conductive graphene-polymer composite film comprising (a) adding graphene to deionized water and ultrasonically dispersing for 0.5-1 hour to obtain a graphene dispersion having a concentration of 1-5 mg/ml, (b) adding nanocellulose to deionized water, and ultrasonically dispersing for 0.5-1 hour to obtain nanocellulose dispersion with a concentration of 1-5 mg/ml, (c) adding polyethylene glycol to deionized water, and ultrasonically dispersing for 0.5-1 hour to obtain a polyethylene glycol dispersion having a concentration of 1-5 mg/ml, (d) mixing the graphene dispersion, nano-cellulose dispersion, and polyethylene glycol dispersion, and stirring uniformly, ultrasonically treating after stirring for 0.5-1 hour to obtain a graphene-nanocellulose-polyethylene glycol mixed solution with a concentration of 1-5 mg/ml, and (e) placing the graphene-nanocellulose-polyethylene glycol mixed solution in a vacuum drying box, and leaving still in a vacuum environment at room temperature for 1-2 hours, removing the gas existing in the mixed solution, and pouring the liquid into a mold, placing in an oven, and drying at 40-50 degrees C for 12-24 hours to obtain the thermally driven shape memory thermally conductive graphene-polymer composite film; and (2) use of the thermally conductive graphene-polymer composite film as a polymer matrix composite material that thermally drives shape memory at 50-70 degrees C, and to prepare intelligent product with high flexibility, high lateral thermal conductivity and thermally driven shape memory performance.