【摘 要】
：
Good dispersibility of graphene in a medium or matrix is a critical issue in practical applications.In this work,graphene was functionalized using N-(4-hydroxyl phenyl) maleimide (4-HPM) via the Diels-Alder (DA) reaction by a one-step catalyst-free approa
【机 构】
：
Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 10002
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Good dispersibility of graphene in a medium or matrix is a critical issue in practical applications.In this work,graphene was functionalized using N-(4-hydroxyl phenyl) maleimide (4-HPM) via the Diels-Alder (DA) reaction by a one-step catalyst-free approach.The optimal reaction condition was found to be 90 ℃ for 12 h using dimethylformamide (DMF) as the solvent.FTIR,Raman spectroscopy,XPS and EDS proved that 4-HPM moieties were successfully grafted onto the surface of graphene.UV-vis and TGA confirmed that the grafting amount of 4-HPM was 3.75％-3.97％ based on the mass of graphene.Functionalized graphene showed excellent dispersion stability when dispersed in common solvents such as ethanol,DMF,water,tetrahydrofuran and pxylene.Meanwhile,functionalized graphene also exhibited pH sensitivity in aqueous due to the phenolic hydroxyls from the 4-HPM moieties.As a result of good dispersion stability and pH sensitivity,compared with graphene,functionalized graphene had better adsorption capacity for methylene blue (MB) from aqueous solution.
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