▎ 摘　　要

NOVELTY - Method for preparing a high-dielectric and heat-conducting composite material, involves (i) mixing polydopamine doped liquid metal nanospheres with graphene oxide, uniformly stirring, adding hydrazine hydrate, reacting, washing, and freeze-drying to obtain polydopamine doped liquid metal/graphene composite particles, and (ii) adding the polydopamine doped liquid metal/graphene composite particles to cyanate ester, pre-polymerizing, pouring into a preheated mold, and curing to obtain the polydopamine doped liquid metal/graphene/cyanate composite material. USE - The method is useful for preparing a high-dielectric and heat-conducting composite material used in preparing dielectric materials (claimed) used for microelectronics. ADVANTAGE - The method adopts structural design, and high thermal conductivity polydopamine doped liquid metal nanospheres are used to separate graphene sheets, improves the stacking phenomenon of graphene sheets, increases the specific surface area of graphene sheets, enhances the compatibility of fillers and cyanate esters, and improves the thermal conductivity, and dielectric constant of composite materials while reducing dielectric loss, DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a high-dielectric and heat-conducting composite material having a thermal conductivity of 2.068-2.983 W/m.K, a dielectric constant of 22-79, and a dielectric loss of 0.007-0.018.