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In this work, the effects of inorganic filler graphite (GE) modified ethylene propylene diene monomer (EPDM) on the radiation resistance of EPDM composites were systematically studied by combining experiment and simulation. The mechanical properties of EPDM with different contents of GE under different radiation doses were analyzed by a tensile strength test. The changes in rubber network structures during the radiation process of EPDM sealing materials were speculated to be due to the compression permanent deformation. The scanning electron microscope (SEM) images clearly showed that GE played a protective role in the EPDM matrix under the synergistic effect of γ-rays and high temperature. In addition, the fraction free volume (FFV) of the material, mean square displacement (MSD) and diffusion coefficient (D) of oxygen in the system were quantitatively studied by molecular dynamics (MD) simulation. The MD simulation results indicated that the addition of GE could reduce the activity space of oxygen in the material and weaken the migration and diffusion of oxygen. This work is expected to provide guidance for the design and preparation of radiation-resistant materials.
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Wang et al. (2024) studied this question.
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