关键词: 石墨烯, 功能化, 分散性, 汉森溶解度参数

Abstract: Graphene as a kind of two-dimensional material is consisted of sp2 carbon atoms, which exhibits excellent properties, such as electronic, electrical, mechanical and thermal properties. However it is easy to form aggregation and difficult to dissolve in solvents because of its unique structure, so that the application is greatly limited. So far, most of the work reported on the dispersion of graphene without assistant of functionalization mainly in N,N-dimethylformamide (DMF) and 1-Methyl-2-pyrrolidinone (NMP), but preparation of graphene dispersion in other organic solvents is an vital step in application. In this work, graphene was surface modified by sodium alginate (SA) and polyvinylpyrrolidone (PVP) to restrain graphene aggregation and improve its dispersion in organic solvents. The functionalized graphene was characterized by scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), Raman spectroscopy and X-ray diffraction (XRD). The dispersion of functionalized graphene in solvents was explored, and Hansen solubility parameters (HSPs) of functionalized graphene was calculated depending on their dispersion. The results showed that the functionalized graphene was successfully prepared. After surface functionalization, the dispersion of functionalized graphene in solvents was significantly changed compared with graphene and two kinds of functionalized graphene had good dispersion in water. Furthermore, HSPs and radius of HSPs sphere of functionalized graphene were changed. ?D and ?H increased and ?P decreased. These change indicated that the polar of graphene was weaken after functionalized, and its dispersion in non-polar solvents was improved. Furthermore, the increasement of radius of HSPs sphere indicated that functionalization expanded the dispersion scope of graphene in solvents.

Key words: graphene, functionalization, dispersion, Hansen solubility parameters (HSPs)