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• Modified metal-organic framwork are applied to improve the radiation resistance of epoxy resins and investigate the anti irradiation mechanism of metal-organic framework. • UIO-66-OH nanoparticles can effectively improve the tensile modulus and thermal stability of epoxy resin. • 88.7% reduction in free radical concentration of UIO-66-OH / EP composite compared to epoxy resin. Understanding the degradation mechanism of epoxy resin under irradiation and enhancing the radiation resistance of epoxy resin are of great significance for its application in aerospace and nuclear industries. In this study, we investigated the radiation resistance of epoxy reinforced by UIO-66-OH metal-organic framework. Outstanding radiation resistance was achieved by using UIO-66-OH nanoparticles as radical scavengers to retard epoxy degradation. The introduction of UIO-66-OH reduces the content of free radicals generated after irradiation by 88.17%. UIO-66-OH also improves the mechanical and thermal properties of epoxy before and after irradiation. The scavenging radicals mechanism of hydrogen atom transfer of UIO-66-OH is more dominant than that of graphene oxide and carbon nanotubes. The radiation resistance of UIO-66-OH nanoparticles is related to hydroxyl functionalization and porous structure. This work provides a new idea and method for improving the stability of epoxy resin under gamma ray radiation. [ABSTRACT FROM AUTHOR]

The steel fiber textile overcomes mostly the shortcomings of traditional reinforcement materials. However, the poor corrosion resistance severely limits service life. In this study, based on the mechanism of stress corrosion and electrochemical corrosion, the epoxy resin anti-corrosion coating was designed and prepared. First, the von Mises stress distribution of lamellar and spherical fillers in epoxy resin was studied by finite element simulation, which confirmed that the stress distribution of spherical SiO 2 filler was more uniform when it was stressed. In addition, to optimize the dispersion of spherical SiO 2 in epoxy resin, the spherical polyaniline@SiO 2 (PANI@SiO 2) composites with core-shell structure were produced with in situ polymerization method. Ultrasonic C scanning results showed that the addition of PANI@SiO 2 nano-filler can effectively reduce the defects in epoxy resin. Compared with bare steel fiber, the composites coating of 2 wt% PANI@SiO 2 /epoxy showed the most excellent resistance to stress corrosion and electrochemical corrosion. The capacitance diameter is two orders of magnitude higher, which has good stability in simulated concrete pore solution. This is due to the fact that the addition of PANI@SiO 2 nanomaterials improves the physical shielding properties of epoxy, creating a labyrinth effect, and that PANI can produce passivation on the metal surface. • The finite element results showed that the spherical filler could improve the stress corrosion resistance of the epoxy composite coating. • Spherical PANI@SiO 2 composites with core-shell structure were successfully prepared, and the coating rate of PANI reached 21.04 %. • The addition of PANI@SiO 2 nanofillers could effectively reduce the defects in the epoxy resin. • The impedance spectrum of the 2 wt% PANI@SiO 2 /EP anticorrosive coating was 6 × 105 Ω/cm2 and showed good stability. [ABSTRACT FROM AUTHOR]