Modification Of Graphene Oxide And Preparation And Properties Of Modified Graphene Oxide/Epoxy Resin Composites

In this paper, three methods in the preparation of graphite oxide was investigated(GO) in order to seek out a method with simple operation and non-pollution. The surface modification and functionalization of graphene oxide was carried out through introducing coupling reagent and Zn2+. And subsequently with KEB9007/GO and ZnO/GO as padding, various epoxy nanocomposites was obtained.The nanocomposites were characterized by XRD, SEM, TG, EDS, Uv-vis, FTIR, contact angle, water absorption test, tensile test and impulse test. Meanwhile, their performance was compared with respect to mechanical property, anti-corrosion and thermostabilization.(1) Although three methods were all qualified in the preparation of GO, the degree of oxidation did differ from each other, which was in the following sequence: AP>HA>HGO. Specially, HGO retained much more aromatic structure. In contrast, the preparation process of AP and HA possessed several advantages in comparison to conventional Hummers method, such as simple operation, non-pollution and practical for use.(2) KH550, KH560 and KEB9007 were all successfully grafted onto the graphene oxide, and KEB9007 appeared to be optimal coupling reagent with remarkable promotion in lipophilicity. The results from our study showed that the optimized dosage of KEB9007/GO was 0.05 wt%, and while it was added into epoxy nanocomposite, the tensile strength, tensile modulus, ultimate elongation and impact strength reached the maximum, which increased by 104.32%, 14.46%, 118.89% and 89.84%, respectively. At the same time, the water absorption rate of the nanocomposite decreased by 44% with obvious increase in thermostability, suggesting that the dispersion of modified GO played a key role in the performance of the composite.(3) The nano ZnO particle, which could be uniformly loaded on the slice of GO, lead to decrease in hydrophilicity and increase in thermostability. It is found that the optimal ratio of ZnO/GO was 0.25 %. When it was added to the epoxy composites, the mechanical properties of this composite reach optimum. In comparison to the original composite, the tensile strength, tensile modulus, ultimate elongation and impact strength increased by 99.87%, 12.09%, 98.35%, 151.48%, respectively. Meanwhile, the water absorption rate was significantly reduced by 81.48% and the thermostability was improved. These results indicated that the ZnO loaded on GO had preferable compatiblity and interface bonding force with epoxy resin matrix.