▎ 摘　　要

NOVELTY - Preparing graphene/polyolefin elastomer microspheres having near-zero dielectric constant, involves mixing concentrated sulfuric acid, graphite and sodium nitrate at a low temperature, adding potassium permanganate, and hydrogen peroxide dropwise and filtering, washing to neutrality and then dispersing, and adding obtained powder to water for secondary dispersion to obtain a dispersion. The obtained dispersion is added to the acidic solution in a dispersed state, and then heat-treated to obtain a graphene foam, which is freeze-dried and ground into a graphene powder. The toluene is added dropwise until the polyolefin elastomer particles are swollen and stirred, and the graphene powder is added and uniformly mixed, and allowed to stand. The material after standing is dried to obtain graphene/polyolefin elastomer microspheres. USE - Method for preparing graphene/polyolefin elastomer microspheres having near-zero dielectric constant. ADVANTAGE - The method enables to prepare graphene/polyolefin elastomer microspheres, which promotes development of chemically controllable electromagnetic properties.