▎ 摘　　要

NOVELTY - Preparation of graphene oxide film crosslinked by borate involves hydrolyzing polyacrylonitrile base film and modifying by an alkali solution, washing, drying, immersing modified base film in polyethyleneimine solution, drying, immersing base film containing polyethyleneimine in ultrasonically dispersed graphene oxide solution, cleaning, and drying, immersing base film containing graphene oxide in borate solution and directly drying and controlling number of repetitions of immersion in graphene oxide solution and borate solution. USE - Preparation of graphene oxide film. ADVANTAGE - The method provides graphene oxide film by simple process under mild reaction conditions, and uses borate as crosslinking agent to improve tensile strength and elastic modulus of graphene oxide film, and is environmentally- friendly.