Preparation Of Three Dimensional Graphene/Cyanate Composite And Its Resistance Of Electron Irradiation

Three dimensional graphene has become a hot topic in the field of polymer modification and many other fields due to its low density, high porosity, large specific surface area and excellent electrochemical properties, etc. In this paper, three dimensional graphene with uniform pore distribution, stron g conductivity, and good mechanical properties has been prepared by hydrothermal. On this basis, vacuum-assisted impregnation method is used to build a three dimensional graphene/cyanate conductive composites, and then to explore its electronic variation under irradiation effect performance, which provides a theoretical basis in spacecraft.Modified Hummers method is firstly used to prepare graphene oxide(GO), and then three dimensional graphene is obtained by hydrothermal method. We studied the influence on the structure and properties of the three-dimensional graphene under four different conditions: direct hydrothermal reduction, hydrazine, ammonia reduction,and joint reduction of ammonia and hydrazine hydrate. By various means such as SEM, FTIR, XPS, XRD, Raman, Conductivity test etc, the results show that the best reducing effect of three dimensional graphene performs when ammonia and hydrazine hydrate are taken as the reducing agent together, with uniform sample structure, strong conductivity, and good mechanical properties. Vacuum-assisted impregnation is used to prepared three dimensional graphene/cyanate ester composites, studying the effects of the content of three dimensional graphene on the composite conductivity. The results show that the conductivity of the prepared composite material has remained in the magnitude of 10-2 S/cm, which increases by 10 orders of magnitude compared to the pure cyanate. A preliminary study has been done on the conducting mechanism, the degree of reduction of the three dimensional graphene and it stacks denser and compact and uniformity have a greater impact on the three dimensional graphene conductivity. Construction of three dimensional graphene conductive network improves the transmission capacity of electrons, thereby increasing the conductivity of the three dimensional graphene/cyanate ester composites.The effect of electron irradiation on the structure and propertie s of three dimensional graphene/cyanate ester composites has been studied. XRD, EPR, Raman, FTIR, TGA, XPS and other means are used to analyze composites before and after irradiation. The results show that with increment of electron irradiation fluence, the conductivity and the thermal stability of the composite material does not change significantly, indicating that the complex three dimensional graphene network plays a good role of charge conduction, which can effectively relieve the charge and discharge phenomenon in deep material. Three dimensional graphene in composite improves the interface level of composites, thereby improving the performance of anti-electron irradiation of three dimensional graphene/cyanate conductive composites.