▎ 摘　　要

NOVELTY - Polyethylene glycol (PEG)/polyacrylamide/graphene solid-solid phase change material with high thermal conductivity comprises PEG, acrylamide, graphene, initiator, and catalyst. The mass ratio of PEG and acrylamide is 5-9:1-5. The graphene is lamellar or monolithic. The mass ratio of crosslinking agent and acrylamide is 1:6-10. The mass ratio of initiator and acrylamide is 1-3:20. The mass ratio of catalyst and total mass of PEG and acrylamide is 7-8 mu L/g. The solvent is deionized water, and its mass ratio to total mass of polyethylene glycol and acrylamide is 10-15:1. USE - PEG/polyacrylamide/graphene solid-solid phase change material with high thermal conductivity used for energy-saving type building material. ADVANTAGE - The phase change material has high latent heat of phase change, suitable phase change temperature, good thermal stability, difficult leakage, stable shape, high heat conductivity coefficient, and low cost. DETAILED DESCRIPTION - PEG/polyacrylamide/graphene solid-solid phase change material with high thermal conductivity comprises PEG, acrylamide, graphene, initiator, and catalyst. The mass ratio of PEG and acrylamide is 5-9:1-5. The graphene is lamellar graphene with 2-17 nm thickness, or monolithic graphene with 0.34 nm thickness. The mass ratio of crosslinking agent and acrylamide is 1:6-10. The mass ratio of initiator and acrylamide is 1-3:20. The mass ratio of catalyst and total mass of PEG and acrylamide is 7-8 mu L/g. The solvent is deionized water, and its mass ratio to total mass of polyethylene glycol and acrylamide is 10-15:1. An INDEPENDENT CLAIM is included for preparation of PEG/polyacrylamide/graphene solid-solid phase change material with high thermal conductivity comprising drying PEG at room temperature under vacuum for 24 hours; refining acrylamide by dissolving in acetone solution at 42 degrees C, hot-filtering, freezing filtrate for 24 hours, cold-filtering, and drying residue inside funnel to constant weight; reacting deionized water in three-necked flask in ice bath under nitrogen protection for 30-60 minutes to remove oxygen; dissolving refined acrylamide and dried polyethylene glycol in deoxygenated deionized water, stirring mixture for 10-20 minutes until fully dissolved, adding crosslinking agent, dispersing graphene into solution with ultrasonication for 1 hour, adding initiator and catalyst, reacting for 15-30 seconds, adding reaction mixture immediately into PTFE mold, ventilating at room temperature for 48 hours for polymerization reaction, and vacuum-drying for 24 hours..