The Preparation Of Graphene/epoxy Resin Composites And The Corrosion Protection Property Under γ-radiation

For the advantage of long cruising distance and high reliability, nuclear powered warships were dispatched to the South China Sea to protect our national sovereignty. To ensure the daily cruise, enough attention must be payed to their poor working conditions of high temperature, high humidity, high salinity and especially the high energy radiation such as gamma ray irradiation. Generally, thermosetting resins such as epoxy and palyamide epoxy were used as protective coatings on the metal materials due to their excellent protection property. However, further processing is still required to improve the anti-radiation damage properties of high polymer resin coatings. In this project, graphene is first modified by several functional groups and then loaded with metal oxides which have better gamma ray shielding and absorbing ability. After dispersed into the epoxy, graphene can synergize with metal oxides to reduce the gamma irradiation damage. The method of dispersing of the modified graphene into epoxy will be study systematically. Meanwhile, the effect on the structure and performance of epoxy resin composite coating after the gamma irradiation will be further researched. We will also explore the gamma ray radiation effect of grapheme/epoxy composite coating under simulated ocean environment, so that the service life of modified graphene/epoxy can be forecasted when serving in the environment of high temperature, humidity, salinity, and high energy radiation. The research contents are as follows:1. In this paper, graphene oxide(GO) was successfully functionalized via surface modification, which is beneficial to obtain the homogeneous dispersion and strong filler-matrix interface in epoxy resin. Then, we incorporated the modificated graphene oxide(GO) into the epoxy resin, followed by thermal polymerization to obtain the functional graphene oxide/epoxy nanocomposite coating.2. In order to explore the stability of GEP under γ-ray irradiation, both the neat epoxy resin and the graphene-based composites were gamma-irradiated by different dosage.To verify the optimum content of FGO for the best corrosion performance of the nanocomposites under the γ-irradiation, we made the composites by varying the content of FGO in 10.0 g DGEBA, using: 25, 50 and 75 mg. And electrochemical data strongly demonstrate that graphene have a better property under the gamma irradiation environment.3. The electron spin resonance(ESR) detection shows that graphene can act as radical scavenger, and a relatively small quantity(0.25 wt%) addition of graphene within the epoxy resin exhibits the least amount of radicals. In addition, electrochemical data strongly demonstrate that graphene is capable of maintaining the anti-corrosion properties under the gamma irradiation environment. The primary radica scavenging sites are believed to be associated with the pristine sp2-carbon domains, which act through adduct formation or electron transfer.4. Graphene decorated with well-dispersed cubic fluorite ceria(CeO2) nanoparticles was prepared through a simple hydrothermal method. Electrochemical data strongly demonstrate that CeO2@FGO/epoxy nanocomposites have a better anticorrosion property under the gamma irradiation environment.