Organically Modified Graphene Oxide And Its Use In Epoxy Resins

Graphene is a dimensional lattice sheet nanomaterials, which is composed of a single layer of carbon atoms. Because of its excellent mechanics, thermal and electrical properties, it has been widely concerned and become a hot topic in material science. Graphene oxide (GO) as a derivative of graphene, has been widely used to make high-performance polymer materials as an ideal fillers. In order to take full advantage of the excellent performance of GO, function is an effective method and the functional GO can be used to improve the related properties of polymer materials. In this paper, organic inhibitors were used to modify GO, got the organic inhibitors/GO composite materials and endowed GO with the corrosion resistance. Those composite materials were mixed with epoxy and got the composite coating. Furthermore, the corrosion resistant of composite coating were researched. The main contents of this dissertation lie as follows:(1)Through the discussion of environment (H2SO4 and H2SO4+H3PO4) and proportion (Gr:KMnO4=1:4/1:6/1:8, wt) of oxidation on GO prepared by modified Hummers method. FT-IR, UV, SEM, TG and XPS were used to characterize the structure of the prepared GO. The results showed that the best prepared environment is H2SO4+H3PO4 mixed acid and the optimal proportion of oxidation is 1:4.(2) Firstly, GO was covalently functionalized with maleic anhydride for enhancing the content of GO carboxyl, and MET-GO composite material was prepared with metronidazole (MET) and modified GO through the esterification reaction. Secondly, the function of P-CD was used ?-(2,3-epoxypropoxy) propyl trimethoxysilane (KH560), and combined with GO to prepare the KH560/?-CD-GO. At last, we prepared the MET/?-CD-GO though physical loading, which were based on KH560/?-CD-GO composite materials. All composite materials were charactered by FT-IT, TG, SEM, XPS and EDS et al. And the results showed that we had prepared those composite materials, successfully.(3) MET-GO epoxy, KH560/?-CD-GO epoxy and MET/?-CD-GO epoxy composite coatings had been prepared by solution blending method. The effect of MET-GO, KH560/?-CD-GO and MET/?-CD-GO were charactered with TG and SEM for epoxy coating. The results indicated that the thermal performance of epoxy coating had been improved. These materials have good dispersion in epoxy resin. Some methods, such as EIS, soak scratches and corrosion test at high temperature and high pressure, were used to appraised the anticorrosion performance of these composite coating. Compared with pure epoxy coating and GO/epoxy coating, the results showed that the three composite coating (MET-GO epoxy, KH560/?-CD-GO epoxy and MET/?-CD-GO epoxy) have higher anti-corrosion.