Investigating The Effect Of Graphene Functional Groups On The Radiation Resistance Of Epoxy Resin And Composite Material

In recent years,many fields such as aerospace industry,nuclear industry,electronic communication industry and medical industry have developed rapidly,but they all operate in the environment of high-energy particles such as X and gamma rays.Therefore,it is very urgent to study the materials against high energy irradiation.Researchers have improved the irradiation resistance of epoxy resin(EP)composites by filling the polymer matrix with nanomaterials.Inorganic carbon nanomaterials have the function of scavenging free radicals from polymer composites irradiated by high energy rays.However,there is no clear explanation of the free homosexual love of epoxy resin matrix after irradiation and the mechanism of inorganic carbon nanomaterials to resist irradiation.Therefore,based on the excellent free radical scavenging function of GO,the effect of functional groups of GO on the radiation resistance of epoxy resin matrix composites was investigated in this paper.In this study,modified Hummer’s method was used to oxidize graphite to GO and reduce GO.The prepared GO and reduced graphene oxide(RGO)were characterized by Fourier Transform infrared absorption spectrometer(FTIR),X-ray diffraction(XRD),Raman spectroscopy(Raman)and X-ray photoelectron spectroscopy(XPS).GO/EP and RGO/EP composites were prepared by resin transfer molding process.The influence of different mass fraction of GO on the irradiation resistance of epoxy resin was investigated,and the optimal mass fraction incorporation ratio was determined.Based on this,the irradiation resistance of two RGO filled epoxy resins with different reduction degrees was studied.The microstructure,thermal stability,thermal mechanical properties,free radical content and microhardness of GO/EP and RGO/EP prepared before and after γ-ray irradiation were characterized by conventional macroscopic testing methods such as FTIR,XPS,thermogravimetry,dynamic thermomechanical and universal strength machine,electron paramagnetic spectrometer and nano indentation.The results showed that for the irradiation resistance of epoxy resin with different mass fraction of GO,the effect was the best when the dosage of GO was 0.3%,and the specific performance was that the concentration of free radical decreased more.The hardness,indentation depth and glass transition temperature drop ratio of γ irradiated composites are 16.00%,416.3 nm and 20.32%,respectively,while the corresponding EP are 41.82%,502.1 nm and 30.34%,respectively.The hardness reduction ratio of RGO/EP composites after γ irradiation is 19.55%,and the indentation depth is increased to 464.7 nm.Compared with pure epoxy resin,the irradiation resistance of RGO/EP composites has been greatly improved.Compared with the effect of GO functional groups,the anti-irradiation ability is slightly reduced compared with that of non-reduced groups.It can be seen that the structure of GO has a variety of oxygen-containing functional groups,which can form a good binding force with the functional groups of EP and have good resistance to γ-ray irradiation.