▎ 摘　　要

NOVELTY - Preparing polyvinyl alcohol-graphene oxide nanocomposite hydrogel involves adding polyvinyl alcohol to deionized water, and heating mixture at 95 degrees C in a water bath for 2 hours to prepare a polyvinyl alcohol aqueous solution, and then mixing graphene oxide aqueous solution. The content of oxidized graphene in mixture is 5 wt.%, and size of graphene sheet is 2 mu m. The solution is stirred at 85 degrees C under magnetic stirring to form a homogeneous mixture with a stirring time of 0.5 hours and mixture is poured into a mold and placed in refrigerator at freezing temperature of -25 degrees C for 20 hours. USE - Method for preparing polyvinyl alcohol-graphene oxide nanocomposite hydrogel (claimed). ADVANTAGE - The method enables to prepare polyvinyl alcohol-graphene oxide nanocomposite hydrogel, which is stable under certain conditions and structure is maintained after melting. DETAILED DESCRIPTION - Preparing polyvinyl alcohol-graphene oxide nanocomposite hydrogel involves adding polyvinyl alcohol to deionized water, and heating mixture at 95 degrees C in a water bath for 2 hours to prepare a polyvinyl alcohol aqueous solution, and then mixing graphene oxide aqueous solution. The content of oxidized graphene in mixture is 5 wt.%, and size of graphene sheet is 2 mu m. The solution is stirred at 85 degrees C under magnetic stirring to form a homogeneous mixture with a stirring time of 0.5 hours and mixture is poured into a mold and placed in refrigerator at freezing temperature of -25 degrees C for 20 hours. The sample is removed and thawed at room temperature for 2-4 hours. The number of freeze thaw cycles is 7, and the resulting hydrogel is dried by freeze drying.