▎ 摘　　要

NOVELTY - A covalently bonded three-dimensional carbon-containing polyurethane high-thermal conductivity film is prepared by ultrasonically dissolving three-dimensional carbon composite powder in an organic solvent, then adding thermoplastic polyurethane solution to obtain a three-dimensional carbon/polyurethane assembly, evaporating the assembly, concentrating, dripping on a substrate, and heat-treating. The three-dimensional carbon composite powder is prepared by covalently grafting functionalized short carbon nanotubes and small-sized reduced graphene oxide. The amount of covalently bonded three-dimensional carbon is 0.5-5% of the mass of three-dimensional carbon/polyurethane assembly. USE - Polyurethane high-thermal conductivity film is used as photothermally controllable film (claimed). ADVANTAGE - The polyurethane high-thermal conductivity film has high thermal conductivity and excellent mechanical property. The three-dimensional carbon material in the polyurethane high-thermal conductivity film is uniformly distributed, and can form an effective heat conduction network. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of polyurethane high-thermal conductivity film, which involves (s1) adding short carbon nanotubes dispersion to diazonium salt solution, stirring, reacting at 25-40℃, washing, filtering, vacuum-drying, and re-dispersing to obtain a functionalized short carbon nanotube dispersion, (s2) mixing small-sized reduced graphene oxide dispersion with the functionalized short carbon nanotube dispersion, adding sodium nitrite, stirring at 25-40℃, washing, filtering, vacuum-drying and grinding to obtain a covalently bonded three-dimensional carbon composite powder, ultrasonically dissolving the covalently bonded three-dimensional carbon composite powder in an organic solvent to obtain covalently bonded three-dimensional carbon dispersion, (s3) adding thermoplastic polyurethane to a mixed solution of dimethylformamide, and tetrahydrofuran, stirring at 25-40℃ until the thermoplastic polyurethane is dissolved to obtain a thermoplastic polyurethane solution, and (s4) adding covalently bonded three-dimensional carbon dispersion to the thermoplastic polyurethane solution, stirring, evaporating and concentrating at 130-180℃ to obtain three-dimensional carbon/polyurethane assembly concentrated solution, dripping the three-dimensional carbon/polyurethane assembly concentrated solution on a glass substrate, and drying at 45-80℃.