▎ 摘　　要

NOVELTY - Preparing graphene thermal interface material comprises e.g. preparing the graphene oxide slurry by dissolving the polyvinyl alcohol (PVA) in the de-ionized water to form PVA solution under the set temperature, mixing the graphene oxide (GO) and PVA solution with set concentration, forming suspension with different concentrations, before freezing, using ultrasonic cell crushing instrument for all suspension ultrasonic processing set time set by ultrasonic cell and vacuumizing to remove bubbles, preparing the graphene oxide support by pouring the GO/PVA aqueous slurry into the mold containing PDMS wedge structure, and performing bidirectional freezing by liquid nitrogen as cold source, taking out the frozen sample from the mold and freezing and drying using freeze drier to dry the set time, (3) synthesizing the self-healing substrate by adding the terminal hydroxy polybutadiene in a dry glass container, vacuum heating in the oil bath for proper time to remove water. USE - The method is useful for preparing graphene thermal interface material. ADVANTAGE - The material has high thermal conductivity, mechanical property and self-healing performance and can meet the intelligent thermal management requirement. DETAILED DESCRIPTION - Preparing graphene thermal interface material comprises (1) preparing the graphene oxide slurry by dissolving the polyvinyl alcohol (PVA) in the de-ionized water to form PVA solution under the set temperature, mixing the graphene oxide (GO) and PVA solution with set concentration, forming suspension with different concentrations, before freezing, using ultrasonic cell crushing instrument for all suspension ultrasonic processing set time set by ultrasonic cell and vacuumizing to remove bubbles, (2) preparing the graphene oxide support by pouring the GO/PVA aqueous slurry into the mold containing PDMS wedge structure, and performing bidirectional freezing by liquid nitrogen as cold source, taking out the frozen sample from the mold and freezing and drying using freeze drier to dry the set time, (3) synthesizing the self-healing substrate by adding the terminal hydroxy polybutadiene in a dry glass container, vacuum heating in the oil bath for proper time to remove water, cooling and dissolving isophorone diisocyanate (IPDI), and dibutyltin dilaurate (DBTDL) in the set volume of DMAc, gradually adding in the container, stirring and setting time under the N2 atmosphere, synthesizing the prepolymer, dissolving the 4, 4' -dithio diphenylamine in dimethylacetamide (DMAc), solution, after stirring at the set temperature, adding the methanol to the solution and further stirring to the set time, pouring the solution into the polytetrafluoroethylene plate, and adding into the vacuum oven for setting time under proper temperature to make the reaction finished; dissolving crude polymer in CH2Cl2, and precipitating into petroleum ether to obtain purified self-healing substrate, (4) self-healing graphene composite material for preparing the graphene oxide after freezing and drying, introducing in a tubular furnace for thermal reduction to obtain the graphene support, adding the Cu metal particles into the synthesized self-healing matrix, and then penetrating into the graphene support to prepare pearl layer simulation composite material, after heat curing to the set time to obtain the self-healing graphene composite material. graphene thermal interface material is a hierarchical structure nano hybrid material with self-healing thermal response, the thermal interface material can be self-healing after external force damage.