▎ 摘　　要

NOVELTY - Preparing graphene nitride/polyvinylidene fluoride nanocomposite material comprises (i) mixing the melamine solution with poloxamer solution, stirring and evaporating to dryness to obtain the graphene nitride precursor; (i) sintering the graphene nitride precursor at a high temperature under a protective atmosphere, and cooling to obtain a graphene nitride nanomaterial; (iii) dissolving proper amount polyvinylidene fluoride in N,N-dimethyl formamide solution under ultrasonic condition to obtain transparent mixed solution; and (iv) dissolving the graphene nitride nano material in the transparent mixed solution, stirring to obtain the black suspension, and evaporating. USE - The method is useful for preparing graphene nitride/polyvinylidene fluoride nanocomposite material is useful in the field of electronic appliances for absorbing and shielding electromagnetic waves (claimed) and for military equipment e.g. aircraft and warships. ADVANTAGE - The method: prepares graphene nitride/polyvinylidene fluoride nanocomposite material with excellent electromagnetic wave absorption and shielding performance; is simple and convenient and environmentally-friendly; has high sample stability; consumes less time and less energy; and can realize mass production. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for nanocomposite material comprises 10 pts. wt. graphene nitride and 10-90 pts. wt. polyvinylidene fluoride.