▎ 摘　　要

NOVELTY - Preparation of regenerated cellulose/graphene nanosheet membrane involves immersing cotton linter pulp into urea/lithium hydroxide solution, stirring, placing in liquid nitrogen, repeating stirring and freezing procedures to obtain regenerated cellulose solution, immersing graphene nanosheets into urea/lithium hydroxide solution, freezing to obtain solidified graphene nanosheet solution, mixing and dissolving phytic acid and lithium chloride in water to prepare phytic acid coagulating bath, adding into regenerated cellulose solution, stirring to obtain regenerated cellulose/graphene nanosheet solution, adding epoxy chloropropane, defoaming, extruding mixed solution to form film, sealing and isolating air, stretching obtained chemical gel, soaking to obtain twin-crosslinking regenerated cellulose/graphene nanosheet hydrogel, removing redundant urea and phytic acid, and drying. The mass of graphene nanosheet is 30-50% of total mass of regenerated cellulose and graphene nanosheet. USE - Preparation of regenerated cellulose/graphene nanosheet membrane. ADVANTAGE - The method use physical and chemical twin-crosslinking strategy and combines stretching to orient graphene nanosheets, provides regenerated cellulose/graphene nanosheet film has high thermal conductivity, mechanical strength double crosslinking and anisotropy of toughness, it can folded for 10000 times and improves thermal conductivity to 33.145 W m-1K-1. DETAILED DESCRIPTION - Preparation of regenerated cellulose/graphene nanosheet membrane involves immersing cotton linter pulp into urea/lithium hydroxide solution pre cooled to below-4℃, stirring until temperature is 0±2℃, placing solution in liquid nitrogen for quick freezing, repeating stirring and freezing procedures until solution is clear and viscous to obtain a regenerated cellulose solution, immersing graphene nanosheets into urea/lithium hydroxide solution under condition of stirring, carrying out ball milling, freezing in liquid nitrogen to obtain a solidified graphene nanosheet solution, mixing and dissolving phytic acid and lithium chloride in a mass ratio of 1-15:1 in water to prepare 5 wt.% phytic acid coagulating bath, adding graphene nanosheet solution into regenerated cellulose solution, stirring at 0-5℃ until graphene nanosheet solution is mixed to obtain a regenerated cellulose/graphene nanosheet solution, adding epoxy chloropropane (ECH) into regenerated cellulose/graphene nanosheet solution, stirring and mixing at 950±50 rpm for 1-3 minutes, defoaming for 1-2 minutes, extruding mixed solution to form a film, sealing and isolating air, leaving still at 5-8℃ for 30±6 hours, stretching obtained chemical gel to more than 100% of original length, soaking stretched chemical gel in 5 wt.% phytic acid coagulating bath to obtain twin-crosslinking regenerated cellulose/graphene nanosheet hydrogel, soaking twin-crosslinked regenerated cellulose/graphene nanosheet hydrogel in water, removing redundant urea and phytic acid, and drying at room temperature. The mass of graphene nanosheet is 30-50% of total mass of regenerated cellulose and graphene nanosheet.