▎ 摘　　要

NOVELTY - A polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material is obtained by bonding polyethylene glycol-modified phase-change material through chemical bond to surface of skeleton material of graphene with high thermal conductivity. The polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material contains imine group-containing derivative (I). USE - Polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material (claimed). ADVANTAGE - The polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material with excellent leakage resistance, thermal conductivity, thermal stability and flexibility, and controlled changeable temperature and enthalpy. DETAILED DESCRIPTION - A polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material is obtained by bonding polyethylene glycol-modified phase-change material through chemical bond to surface of skeleton material of graphene with high thermal conductivity. The polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material contains imine group-containing derivative of formula (I). G=oxidized graphite sheet structure; R=OH, NH2, or group which optionally react with cyanic acid, phenolic hydroxy, carboxy, ethylene polyamine, polyamide, polyether ethylenediamine or phenolic aldehyde amine;and n=molecular weight of polyethylene glycol chosen from polyethylene glycol 400, polyethylene glycol 800, polyethylene glycol 2000, polyethylene glycol 4000, polyethylene glycol 6000, polyethylene glycol 10000 and polyethylene glycol 20000. An INDEPENDENT CLAIM is included for preparation of polyurethane-functionalized graphene-polyethylene glycol-containing phase-change material, which involves stirring graphite oxide, N,N-dimethylformamide and thionyl chloride at room temperature, heating mixture at 50-80 degrees C for 12-24 hours, centrifuging mixture to remove thionyl chloride, washing mixture with dried trichloromethane for predetermined time and vacuum drying mixture at 50-80 degrees C to obtain intermediate (m1) comprising (acyl chloride) graphite oxide, dispersing cyanuric chloride in refrigerated acetone and deionized water, completely stirring mixture at 0-5 degrees C, dripping ammonia for 30 minutes, reacting mixture for 30-60 minutes and filtering mixture to obtain intermediate (m2) comprising containing 2-amino-4,6-dichloro-1,3,5-triazine, dispersing intermediate (m1) and intermediate (m2) in dimethylformamide solution, adding triethylamine, mixing mixture at 70-90 degrees C for 24-30 hours, centrifuging mixture with ethanol and refrigerating mixture with deionized water to obtain intermediate (m3), adding cold acetone to intermediate (m3), adding deionized water, dripping ammonia through separatory funnel, reacting mixture at 70-90 degrees C for 1-2 hours, drying mixture at 70-90 degrees C to obtain intermediate (m4), adding predetermined molar amount of polyethylene glycol (400-20000) to three-necked flask comprising sufficiently-purified dimethylformamide solvent, heating mixture at 70-80 degrees C, magnetically stirring mixture for 1 hour under nitrogen atmosphere such that the polyethylene glycol is sufficiently dissolved in dimethylformamide solvent, adding diphenylmethane diisocyanate with respect to content of polyethylene glycol and 0.1-0.5% dibutyltin dilaurate to polyethylene glycol solid powder and reacting mixture under nitrogen atmosphere for 3-5 hours, to obtain intermediate (m5), growing organic small molecule melamine (inorganic/organic skeleton matrix) on surface of graphene oxide, dissolving graphene oxide in purified dimethylformamide, slowly adding polymerized polyurethane-polyethylene glycol organic molecules and 0.1-0.5% catalyst dibutyltin dilaurate to mixture, heating mixture at 85 degrees C for 10-12 hours under nitrogen atmosphere, to obtain reaction product, adding reaction product to beaker, washing with ethanol and processing mixture at 60-70 degrees C.