Modeling of oxidation process and property changes of ethylene-propylene-diene copolymer


The oxidation process induced in ethylene-propylene-diene (EPDM) copolymer by gamma irradiation was simulated by solving equations on chemical reactions and gas diffusion rates. Thence, distributions of oxidative products and gases and changes in material properties were clarified. All the oxidative product such as ketones, alcohols, and carboxylic acids, crosslinks between molecular chains, and chain scissions in EPDM increase with irradiation and that they show concave spatial distributions within the sample sheets. The simulation results demonstrates that EPDM becomes arduous when it absolutely was irradiated by gamma rays and the rise in hardness is additional important at the surface of the sample sheet than its inside. Moreover, it had been found that a low diffusion coefficient of oxygen in EPDM leads to the appearance of a clearer diffusion-restricted regime of degradation. These simulation results are in smart agreement with experimental results.

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