Effect of gamma radiation on carbon-black-filled EPDM seals in water and air. (December 2017)

• Record Type: Journal Article
• Authors: Pourmand, P.; Hedenqvist, L.; Pourrahimi, A.M.; Furó, I.; Reitberger, T.; Gedde, U.W.; Hedenqvist, M.S.
• Is Part Of: Polymer degradation and stability. Volume 146(2017)
• Page Start: 184
• Page End: 191
• Publication Date: 2017-12
• Subjects: EPDM -- Gamma radiation -- Water -- Air -- Carbon black -- High dose-rate; Polymers -- Deterioration -- Periodicals; Stabilizing agents -- Periodicals; Polymères -- Dégradation -- Périodiques; Stabilisants -- Périodiques; 668.9
• DOI: 10.1016/j.polymdegradstab.2017.10.008
• Languages: English
• ISSNs: 0141-3910

Abstract

Abstract: The effects of γ radiation in air and water on a highly filled carbon-black-containing EPDM seal, used in transportation valves for old-fuel rods, were investigated. Samples were irradiated at a dose rate of 7 kGy h −1 until total doses of 0.35, 1.4, 2.1 and 3.5 MGy were reached. The doses were chosen to correspond to 1, 4, 6 and 10 years of service. Infrared spectroscopy, mechanical indenter and NMR relaxation time ( T 2 ) measurements indicated an oxidative crosslinking of the seal, which increased monotonically with the dose. The effects were larger in air than in water, and in air, diffusion-limited oxidation was observed. The compression set increased with increasing dose of radiation and was the highest for seals irradiated in air. The water uptake into the rubber, which was always lower than 1 wt.%, increased with the dose, showing the effect of increased polarity by the oxidation of the rubber.