▎ 摘　　要

NOVELTY - Method for preparing polydicyclopentadiene-based carbon nanotube/graphene nanosheet aerogel flame-retardant electromagnetic shielding composite material, involves (i) dissolving chitosan in glacial acetic acid aqueous solution, stirring to prepare a chitosan solution, (ii) taking multi-walled carbon nanotubes and graphene nanosheets and dispersing in deionized water, adding the chitosan solution and dispersing agent polyvinylpyrrolidone, uniformly mixing, and ultrasonically dispersing, (iii) injecting the solution to a watch glass, and freeze-drying the solution to obtain carbon nanotube/graphene nanosheet aerogel, (iv) reacting 5-norbornene-2-carboxylic acid with terminal hydroxyl-containing oligomeric phosphate, and (v) mixing the norbornene-functionalized oligomeric phosphate halogen-free liquid flame retardant with dicyclopentadiene to obtain a mixed solution, placing the aerogel in mold, injecting mixed solution and heating to initiate polymerization. USE - The method is used for preparing polydicyclopentadiene-based carbon nanotube/graphene nanosheet aerogel flame-retardant electromagnetic shielding composite material. ADVANTAGE - The method is simple to operate, and has low energy consumption and high efficiency. The electromagnetic shielding composite material has excellent flame retardant performance, high electromagnetic shielding efficiency, and high thermal stability. DETAILED DESCRIPTION - Method for preparing polydicyclopentadiene-based carbon nanotube/graphene nanosheet aerogel flame-retardant electromagnetic shielding composite material, involves (i) dissolving chitosan in a 0.1 mol/l glacial acetic acid aqueous solution, continuously stirring at room temperature until the chitosan is completely dissolved to prepare a 1 wt.% chitosan solution, (ii) taking multi-walled carbon nanotubes and graphene nanosheets and dispersing in deionized water, adding the chitosan solution obtained in step (i) and dispersing agent polyvinylpyrrolidone, uniformly mixing, and ultrasonically dispersing, (iii) injecting the solution obtained by ultrasonic wave in step (ii) to a watch glass, and freeze-drying the solution after directional freezing to obtain carbon nanotube/graphene nanosheet aerogel, (iv) reacting 5-norbornene-2-carboxylic acid with terminal hydroxyl-containing oligomeric phosphate to obtain norbornene-functionalized oligomeric phosphate halogen-free liquid flame retardant, where the terminal hydroxyl-containing oligomeric phosphate has a hydroxyl value of 50-800mg potassium hydroxide/g, the phosphorus content is 5-60 wt.%/wt.%, the viscosity range is 10-3-5 Pa.second, and the density is 0.9-1.5 g/m3, and (v) mixing the norbornene-functionalized oligomeric phosphate halogen-free liquid flame retardant obtained in step (iv) with dicyclopentadiene to obtain a mixed solution, placing the aerogel in a corresponding mold, injecting norbornene-functionalized oligomeric phosphate halogen-free liquid flame retardant and dicyclopentadiene mixed solution and heating to initiate polymerization to obtain the polydicyclopentadienyl carbon nanotube/graphene nanosheet aerogel flame retardant electromagnetic shielding composite material.