▎ 摘　　要

NOVELTY - Graphene-based dielectric elastomer composite comprises rubber elastomer matrix, graphene oxide based dielectric filler and crosslinking agent, where the matrix, per 100 parts by mass, is dispersed with 0.15 parts by mass of the filler and 0.5-5 parts by mass of the crosslinking agent. The filler is a flake-like graphite oxide coated hybrid core-shell carbon nanospheres, where the mass ratio of carbon nanospheres to the graphene oxide is 5:1-1:1, and hybrid core-shell nanospheres are wrapped in the elastomer matrix and oriented in a 3-dimensional network. USE - Used as graphene-based dielectric elastomer composite. ADVANTAGE - The graphene-based dielectric elastomer composite has improved dispersion of graphene-oxide based filler, and can be obtained at low driving voltage with high electromechanical sensitive factor. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for preparing the graphene-based dielectric elastomer composite, comprising (a) ultrasonically dispersing graphite oxide in deionized water at an ultrasonic power of 300-1000 W for 1-6 hours to obtain an aqueous solution of graphene oxide, and ultrasonically dispersing carbon nanospheres in deionized water at an ultrasonic power of 300-1000 W for 2-8 hours to obtain a stable suspension of the carbon nanospheres, (b) mixing the ultrasonically dispersed aqueous graphene oxide solution with the carbon nanosphere suspension at room temperature with mechanical stirring and reacting for 3-6 hours, where the mass ratio carbon nanospheres to the graphene oxide in the mixture is 5:1-1:1, after completion of the reaction, filtering the mixture, washing with deionized water, and freeze-drying to give sheath of graphene oxide coated hybrid core-shell carbon nanosphere filler, (c) ultrasonically dispersing the obtained hybrid core-shell particles in deionized water and then mixing with rubber emulsion, where to the solid content of the emulsion, calculated as 100 parts by mass of the rubber, the filler particles are added at a concentration of 0.15 parts by mass, at an ultrasonic power of 100-300 W for 2-6 hours, and then adding 0.5-5 parts by mass of the crosslinking agent and ultrasonically dispersing to obtain a mixed emulsion, (d) subjecting the mixed emulsion to vacuum evaporation at 40-50 degrees C and dehydrating to obtain a preformed composite membrane, and (e) curing the preformed composite at 145-180 degrees C for 20-40 minutes, without applying pressure to ensure that the latex particle morphology is not destroyed, and then hot pressing at 160-200 degrees C for 1-3 hours at a pressure of 0.5-3 MPa.