▎ 摘　　要

NOVELTY - Preparing a graphene/polyurethane dielectric elastomer composite material involves adding 1 gram graphene oxide and 250-300 ml N,N-dimethylformamide solvent to a three-necked flask and ultrasonically dispersing for 0.5-1 hour. The 0.025-0.05 g azobisisobutyronitrile and 0.5-1 g polyethylene glycol added with sulfhydryl groups into the three-necked bottle to form a mixture. The three-necked flask containing the mixture are vacuumed, flushed with nitrogen, then the above mixture is reacted at 65-75 degrees C under the protection of nitrogen for 6-8 hours. The solid product obtained is suction filtered and washed with a large amount of deionized water, and performed vacuum drying at 50-60 degrees C for 12-16 hours. The polyethylene glycol modified graphene oxide obtained through click chemistry reaction. The 1 gram of polyethylene glycol modified graphene oxide and 250-300 ml of deionized water added into a single-neck bottle and ultrasonically dispersed for 0.5-1 hour. USE - Method for preparing a graphene/polyurethane dielectric elastomer composite material. ADVANTAGE - The method enables to prepare a graphene/polyurethane dielectric elastomer composite material has a higher dielectric constant and better electro-deformation ability. DETAILED DESCRIPTION - Preparing a graphene/polyurethane dielectric elastomer composite material involves adding 1 gram graphene oxide and 250-300 ml N,N-dimethylformamide solvent to a three-necked flask and ultrasonically dispersing for 0.5-1 hour. The 0.025-0.05 g azobisisobutyronitrile and 0.5-1 g polyethylene glycol added with sulfhydryl groups into the three-necked bottle to form a mixture. The three-necked flask containing the mixture are vacuumed, flushed with nitrogen, then the above mixture is reacted at 65-75 degrees C under the protection of nitrogen for 6-8 hours. The solid product obtained is suction filtered and washed with a large amount of deionized water, and performed vacuum drying at 50-60 degrees C for 12-16 hours. The polyethylene glycol modified graphene oxide obtained through click chemistry reaction. The 1 gram of polyethylene glycol modified graphene oxide and 250-300 ml of deionized water added into a single-neck bottle and ultrasonically dispersed for 0.5-1 hour. The 1-2 grams of sodium borohydride added to the three-necked flask to form a mixture. The above mixture is reacted at 80-90 degrees C for 4-6 hours. The solid product obtained is suction filtered and washed with a large amount of deionized water. The vacuum drying is performed at 50-60 degrees C for 12-16 hours to obtain polyethylene glycol modified graphene. The 0.003-0.06g polyethylene glycol modified graphene, 2.940-2.997g thermoplastic polyurethane elastomer particles and 30-50ml tetrahydrofuran added into a single-neck bottle, and stirred for 4-6 hours until the thermoplastic polyurethane elastomer is completely dissolved and a homogeneous mixture is formed. The above mixture is poured into a polytetrafluoroethylene template and spreaded, and natural air dried for 48-72 hours. The vacuum drying is carried out at 35-40 degrees C for 12-24 hours to obtain a graphene/polyurethane dielectric elastomer composite film with a thickness of 80-150 microns.