Abstract
The aging behavior of nitrile butadiene rubber (NBR) was studied by performing a thermo-oxidatively accelerated-aging test in a closed oxygen-rich atmosphere. The oxygen-consumption rates of the aged NBR were measured and correlated with changes in the chemical and physical properties of the rubber. Changes in the morphological, chemical, and mechanical properties of the aged NBR were examined via scanning electron microscopy, X-ray photoelectron spectroscopy (XPS), and tensile tests. Morphological observations revealed that the aging conditions severely degraded the surface of the NBR, and additive particles migrated from the inner part of the NBR to the surface at temperatures above 60 °C. XPS indicated that the surface or cross-sectional face of the NBR was oxidized heterogeneously after the thermo-oxidative aging. The oxidation induced cross-linking, which caused the tensile modulus of the NBR to increase with an increase in the aging time and temperature; tensile elongation tended to decrease. The results of the thermo-oxidative accelerated-aging test were analyzed based on the Arrhenius model, using data of the oxygen-consumption rates. Finally, the activation energy of the degradation process was determined and the lifetime of the NBR was calculated. The lifetime of NBR conserved at 25 °C was estimated to be 11.12 years at a 40 % oxygen-consumption rate.
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Acknowledgement
This work was supported by the Research Funding (UE 161034GD) from Agency for Defense Development(ADD) in the Republic of Korea.
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Lee, S.Y., Eom, S.B., Won, J.S. et al. Evaluation of Aging Behavior of Nitrile Butadiene Rubbers via Oxygen-consumption Experiments. Fibers Polym 22, 639–646 (2021). https://doi.org/10.1007/s12221-021-0345-y
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DOI: https://doi.org/10.1007/s12221-021-0345-y