▎ 摘　　要

NOVELTY - The preparation method of graphene nanobelt/poly(methyl methacrylate) micro-foamed nanocomposite material involves oxidizing long-walled carbon nanotubes to obtain graphene nanobelt, dispersing graphene nanobelt in dimethylformamide, and refluxing to obtain graphene nanobelt dispersion, blending dispersion with poly(methyl methacrylate), ultrasonically dispersing, anti-solvent precipitating, freeze-drying and hot-pressing to obtain graphene nanobelt/poly(methyl methacrylate) nanocomposite material, placing the nanocomposite material in a mold, and placing in a high pressure reactor. USE - Preparation of graphene nanobelt/poly(methyl methacrylate) micro-foamed nanocomposite material used in aerospace application, electronic packaging application, or automobile protection application. ADVANTAGE - The method enables the preparation of graphene nanobelt/poly(methyl methacrylate) micro-foamed nanocomposite material with small pore diameter, and high cell density, and mechanical strength. DETAILED DESCRIPTION - The preparation method of graphene nanobelt/poly(methyl methacrylate) micro-foamed nanocomposite material involves oxidizing long-walled carbon nanotubes to obtain graphene nanobelt, dispersing graphene nanobelt in dimethylformamide, and refluxing at high temperature to obtain graphene nanobelt dispersion, blending dispersion with poly(methyl methacrylate), ultrasonically dispersing, anti-solvent precipitating, freeze-drying and hot-pressing to obtain graphene nanobelt/poly(methyl methacrylate) nanocomposite material, placing the nanocomposite material in a mold, placing in a high pressure reactor, saturating with supercritical carbon dioxide, and rapidly decompressing.