▎ 摘　　要

NOVELTY - Manufacturing graphene oxide involves adding graphite and oxidizing agent in acid solution and then stirring the obtained material to obtain a mixed solution. The mixed solution is neutralized and then the neutralized material is freeze-dried to obtain the graphene oxide powder. The obtained powder is added with alcohol solvent and then the obtained material is freeze-dried to obtain the desired product. USE - Method for manufacturing graphene oxide used for manufacturing polymer film (claimed). ADVANTAGE - The method enables to manufacture graphene oxide in simple manner, with excellent dispersibility, and has ensured excellent gas barrier property of the polymer film. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for manufacturing polymer film, which involves: (A) dispersing graphene oxide in distilled water to obtain dispersion solution; (B) stirring polymer resin containing a hydroxyl group with distilled water to obtain a polymer solution; (C) mixing and stirring the polymer solution with dispersion solution; and (D) coating and drying the mixed solution on a film to obtain the desired product.