The Reserch For The Reduction Of Graphene Oxide Reduced Bygrignard’s Reagent And The Preparetion Of Polypropylene/graphene Nanocomposites

Graphene sheets, having single-atomic layered structure and unique mechanical,thermal, and electrical properties, hold great promise for many technological applications.In this dissertation, we focused on the investigation for the reduction of gaphene oxidereduced by Grignard’s reagent and polypropylene/graphene nanacomposites had beenprepared by in situ polymerization.First the graphene oxide had been prepared through the modified Hummers’ method.Then Grignard’s reagent was used to take an action with the graphene oxide. We had foundthat the Grignard’s reagent has a good efficiency in the reduction of graphene oxide.Elemental analysis, X-ray diffraction (XRD), Fourier transform-infrared spectroscopy(FTIR), X-ray photoelectron spectroscopy (XPS), et al. had been used to characterized theproducts and the results indicated that the oxygen containing groups could be removedeffectively from the surface of the graphene oxide. The TGA and conductivity test resultsshowed that the thermal stability of graphene has been improved significantly and theelectrical conductivity of graphene is increased.The effect of the action time, the concentrations of Grignard’s reagent, and the varietyof Grignard’s reagent had been test in this action. We found the action had almost beendown that after5h and high concentration and shorter alkyl chain of Grignard’s reagentwould be benefit to the reduction action.In order to understand the process or the possible mechanism of this action we hadused different treatment to deal with the products. The results indicated that after treatedwith Grignard’s reagent the graphene oxide had been reduced, meanwhile it also could be acatalyst supporter.The reduced product gaphene had been used as a supporter to prepare Ziegler-Nattacatalyst. Polypropylene/graphene nanocomposites were prepared by in situ intercalativepolymerization. In this way the gaphene could be homogeneous dispersed in thepolypropylene matrix.