▎ 摘　　要

NOVELTY - High thermal conductivity polymer material composite film with thermal response performance, comprises multi-layer composite film with high thermal conductivity and heat-driven shape memory performance comprising 0-20 wt.% graphene, 0-20 wt.% boron nitride, 30-40 wt.% nano-cellulose and 30-40 wt.% polyethylene glycol. USE - As high thermal conductivity polymer material composite film with thermal response performance. ADVANTAGE - The composite film has excellent flexibility, high in-plane thermal conductivity and thermally driven shape memory performance. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing thermally responsive polymer material composite film with high thermal conductivity, involving (i) adding boron nitride, graphene, nano-cellulose and polyethylene glycol to dispersant, stirring for 0.5-1 hour and ultrasonically treating for 5-10 minutes to prepare boron nitride dispersion, graphene dispersion, nanocellulose dispersion and polyethylene glycol dispersion with a concentration of 1-5 mg/ml, (ii) mixing boron nitride dispersion, graphene dispersion, nanocellulose dispersion and polyethylene glycol dispersion, stirring for 0.5-l hour, and ultrasonically treating for 5-10 minutes to obtain a boron nitride-nanocellulose-polyethylene glycol mixture, graphene-nanocellulose-polyethylene glycol mixture and graphene/boron nitride-nanocellulose-polyethylene glycol mixture with a concentration of 5-10 mg/ml, (iii) mixing nano-cellulose dispersion and polyethylene glycol dispersion to obtain a nano-cellulose-polyethylene glycol mixture, putting the above-mentioned mixed liquid and the three mixed liquids respectively in a vacuum-drying box, and leaving still in a vacuum environment at room temperature for 0.5-1 hour to remove the gas existing in the mixed liquid, (iv) pouring the three mixtures obtained in step (ii) and the nanocellulose-polyethylene glycol mixture obtained in step (iii) into a mold and placing in an oven at 40-50 degrees C to dry for 6-10 hours for preparing nano-cellulose-polyethylene glycol composite film (P), graphene-nanocellulose-polyethylene glycol composite film (G), boron nitride-nanocellulose-polyethylene glycol composite film (B) and graphene/boron nitride-nanocellulose-polyethylene glycol composite film (U-GB), and (v) repeating step (iv) several times to obtain multiple monolayer films, stacking the single-layer composite films together in a set order and hot pressing to obtain multilayer high thermal conductivity graphene-boron nitride-polymer composite film with thermally driven shape memory characteristics.