Study On The Anti-radiation Properties Of Nanomaterials/epoxy Resin Composites

With the rapid development of the nuclear industry and aerospace fields,the service life of materials such as the periphery of nuclear equipment and aerospace detectors has received more and more attention.The materials around nuclear facilities and detectors will be irradiated by high-energy rays（such as gamma rays,high-energy electrons,neutrons,etc.）,which will break the internal molecular chains of the materials,reduce the mechanical properties and thermal stability of the materials,and shorten the service life of the material is improved.The damage of high-energy rays to materials comes from the fact that free radicals caused by irradiation have a strong damaging effect on the chemical bonds of materials.Therefore,reducing the content of free radicals caused by irradiation can reduce the damage to materials caused by irradiation.This paper first introduces carbon nanotubes（carbon nanotubes,graphene oxide,and carbon black）into epoxy resin（EP）through solution mixing to obtain carbon nanotubes/epoxy resin（CNTs/EP）,graphite oxide/epoxy resin（GO/EP）,and carbon black/epoxy resin（CB/EP）composites,and then the sample is irradiated with a dose of 10 MGy underγ-rays.By characterizing and analyzing the chemical bond,free radicals,hardness,thermal stability of the samples before and after irradiation,it can be seen that the addition of three carbon nanomaterials reduces the free radicals in the samples,among which the GO/EP composite free radicals is least,CNTs/EP comes next,and CB/EP is relatively more.The reduction of free radicals is that theΠelectrons formed by the six-membered ring honeycomb structure of carbon nanomaterials can form aΠ-Πstacking effect with free radicals.The reduction of free radical content reduced the fracture of chemical bonds in the sample.After irradiation,the EP surface fractured for 4.51%,CB/EP for 4.12%,CNTs/EP for 3.02%,and GO/EP for 2.06%.At the same time,compared with EP,the changes in mechanical properties and thermal stability of the CB/EP,CNTs/EP,and GO/EP before and after irradiation are reduced,that is,the radiation resistance is increased.On the basis of the above research,graphite phase carbon nitride（C₃N₄）,metal-organic framework material ZIF,and two-dimensional titanium carbide（MXene）are introduced into EP and cured to obtain C₃N₄/EP,ZIF/EP,MXene/EP composite,also irradiated with 10 MGy ofγ-rays.Through testing and analysis,it can be obtained that MXene,ZIF,and C₃N₄ can be used as free radical scavengers to reduce the free radicals generated when EP is irradiated,thereby reducing the chemical bond damage of free radicals to the resin matrix,so that C-C bond breakage is reduced,and pure EP is reduced 3.76%,while MXene/EP dropped by 3.06%,ZIF/EP dropped by 3.19%,and C₃N₄/EP dropped by 3.51%.The reduction of chemical bond breakage enhances the mechanical properties and thermal stability of the sample.This project has conducted a preliminary exploration on the anti-radiation performance of different nanomaterials to resins.Through the analysis of experimental results,nanomaterials with a stable six-membered ring structure have certain free radical scavenging capabilities.It provides a certain reference value for the selection of nanomaterials in the subsequent improvement of the radiation resistance of the resin.