▎ 摘　　要

NOVELTY - Micro-airbag structure loaded with magnetic particle comprises carbon nanofiber embedded in graphene sheet, and magnetic particles are distributed on surface and inside the composite material. The special structure endows GCF with excellent tensile strength (10.4 MPa) at 5% strain. The graphene-based composite film with 10 wt.% amidoximated polyacrylonitrile nanofiber exhibits an extremely low density of about 0.678 g/cm3and an excellent electrical conductivity of 1.72×105 S/m. In addition, excellent electromagnetic shielding effectiveness of 55-57dB is achieved, and the corresponding value of specific shielding effectiveness/thickness can reach 67601-70059 dB.cm2/g. USE - The micro-airbag structure loaded with magnetic particle is useful in field of electromagnetic shielding. ADVANTAGE - The micro-airbag structure loaded with magnetic particle has high crystallization orientation, good conductivity and heat conductivity, high flexibility and excellent electromagnetic shielding performance material in next generation of foldable and wear-resistant electronic product, and is good for enhancing dielectric loss of material. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing micro-airbag structure loaded with magnetic particle comprising (1) adding polyacrilonitrile to N,N-dimethylformamide solvent, and stirring magnetically at room temperature to obtain polyacrilonitrile spinning solution, (2) adopting electrospinning technology to obtain primary polyacrilonitrile nanofiber film, (3) vacuum-drying polyacrilonitrile nanofiber composite film to obtain amidoximated polyacrilonitrile nanofiber film, (4) broking polyacrilonitrile nanofiber film with disperser, adding mixed solution of thioacetamide and sodium molybdate, transferring homogeneous mixed solution and nanofiber suspension to Teflon (Chemical coating) autoclave and heating for hours, (5) adding product of hydrothermal reaction of graphene oxide aqueous solution to obtain a mixed solution, (6) vacuum filtering mixed solution to obtain a thin film product, i.e. drying in vacuum, (7) carrying out preoxidation at a certain temperature to film, and (8) subjecting pre-oxidized product to high-temperature carbonization at certain temperature.