O₃Modified Carbon Feber/Cyanate Ester Composites And Electron And Proton Coirradiation Effect Research

Carbon fiber reinforced cyanate ester resin composite materials as a kind ofadvanced composite materials were more and more widely used in the aerospace, militaryand civilian aspect. Due to the defect and chemically inertness of CF surface, theinterfacial adhesion between CF and resin was weak, and excellent comprehensiveperformance of composites were limited. In this article, carbon fiber surfaces weremodified by ozone oxidation treatment to improve the interfacial property of composite.And performance evolution and the damage mechanism of untreated and treated materialswere studied under electron and proton comprehensive irradiation, which surport thetheoretical foundation and technical support for carbon fiber/cyanate ester compositesapplication.SEM, XPS, XRD, IR, etc were used to characterize and analyze the morphology andchemical structure on the surface of carbon fiber. The results showed carbon fibersurfaces were etched and became more rough increases after ozone treatment. And therelative content of oxygen and oxygen polar functional groups on carbon fiber surfacesincreased gradually by ozone oxidation treatment. CF surface still belonged to graphite-like structure and graphitization degree declined so that CF surfaces were activated.CF of untreated and treated by ozone and cyanate ester resin were used asreinforcement and matrix respectively to prepared CF/CE composites, Electronicuniversal testing machine, SEM and AFM were used respectively to characterize theinterlaminar shear strength (ILSS) and the interface bonding condition of composites. Theresults shown that the ILSS of CF/CE composites increased significantly after ozonetreatment and displayed32.65%higher values than those of untreated composites whenthe treatment time was7min, ozone concentration was35mg/L, the temperature was60℃.And the combination of the composite interface conditions improved significantly afterozone treatment. CF surface topography changed little and graphitization degree of CFsurfaces increased after irradiation. The interlaminar shear strength (ILSS) of CF/CEincreased until the fluence of1×16e(p)/cm2, and then decreased.CE and CF of untreated and treated and CE/CF composites were irradiated by160KeV electrons and protons with space combined irradiation simulator. According tothe results, CE resin matrix occurred large irradiation damage under electrons and protonsco-irradiation, with the change of the CE surface color and morphology.the CE surfaces under irradiation ocurred break or form new chemical bonds and carbonization, whichresulted in the change of chemical composition and component on CE surfaces. Theinterlaminar shear strength (ILSS) of CF/CE increased until the fluence of1×1016e(p)/cm2, and then decreased, largely because of existing crosslinking and degradationreaction of composite under co-irradiation. Mass loss of CE matrix, CF and CF/CEcomposites increased with increase of the fluence, and then began to flatten.