▎ 摘　　要

NOVELTY - The preparation method of long-chain alkylamine-functionalized graphene involves adding an acid to a graphene oxide aqueous solution to adjust the pH-value of solution to less than 7, adding an ethanol solution of long-chain alkylamine to the graphene oxide aqueous solution with the pH-value adjusted, evenly mixing to obtain a mixed solution, then performing grafting reaction and chemical reduction under heating conditions, separating the resulting mixed reaction solution to remove unreacted long-chain alkylamine, and washing with ethanol. USE - The method is useful for preparing long-chain alkylamine-functionalized graphene, which is useful for preparing graphene/polymer composite material. ADVANTAGE - The method enables simple preparation of long-chain alkylamine-functionalized graphene under mild reaction condition with strong practicability in an environmentally-friendly manner. DETAILED DESCRIPTION - The preparation method of long-chain alkylamine-functionalized graphene involves adding an acid to a graphene oxide aqueous solution to adjust the pH-value of solution to less than 7, adding an ethanol solution of long-chain alkylamine to the graphene oxide aqueous solution with the pH-value adjusted, evenly mixing to obtain a mixed solution, then performing grafting reaction and chemical reduction under heating conditions, separating the resulting mixed reaction solution to remove unreacted long-chain alkylamine, washing with ethanol to obtain an ethanol solution or a slurry material of long-chain alkylamine functionalized graphene, and drying to obtain product. An INDEPENDENT CLAIM is included for long-chain alkylamine-functionalized graphene prepared by the above method.