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Effect of gamma radiation on carbon-black-filled EPDM seals in water and air
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
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2017 (English)In: Polymer degradation and stability, ISSN 0141-3910, E-ISSN 1873-2321, Vol. 146, p. 184-191Article in journal (Refereed) Published
Abstract [en]

The effects of gamma 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.

Place, publisher, year, edition, pages
Elsevier, 2017. Vol. 146, p. 184-191
Keyword [en]
EPDM, Gamma radiation, Water, Air, Carbon black, High dose-rate
National Category
Polymer Technologies
Identifiers
URN: urn:nbn:se:kth:diva-222458DOI: 10.1016/j.polymdegradstab.2017.10.008ISI: 000423245900020Scopus ID: 2-s2.0-85032201023OAI: oai:DiVA.org:kth-222458DiVA, id: diva2:1181681
Funder
Swedish Radiation Safety AuthoritySwedish Research CouncilVattenfall AB
Note

QC 20180209

Available from: 2018-02-09 Created: 2018-02-09 Last updated: 2018-02-09Bibliographically approved

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Pourmand, PayamHedenqvist, LisaPourrahimi, Amir MasoudFuro, IstvanReitberger, TorbjörnGedde, UlfHedenqvist, Mikael S.
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Fibre and Polymer TechnologyApplied Physical ChemistryPolymeric Materials
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