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논문 기본 정보

자료유형
학술저널
저자정보
송인영 (울산과학기술원) 이태현 (한국기계연구원) 류경하 (한국기계연구원) 김용진 (한국기계연구원) 김명성 (한국기계연구원) 박종원 (한국기계연구원) 김지현 (울산과학기술원)
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제54권 제12호
발행연도
2022.12
수록면
4,514 - 4,521 (8page)
DOI
10.1016/j.net.2022.08.006

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In this study, the effects of heat and radiation on the degradation behaviour of fluoroelastomer under simulated normal operation and a severe accident environment were investigated using sequential testing of gamma irradiation and thermal degradation. Tensile properties and Shore A hardness were measured, and thermogravimetric analysis was used to evaluate the degradation behaviour of fluoroelastomer. Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the structural changes of the fluoroelastomer. Heat and radiation generated in nuclear power plant break and deform the chemical bonds, and fluoroelastomer exposed to these environments have decreased CeH and functional groups that contain oxygen and double bonds such as CeO, C¼O and C¼C were generated. These functional groups were formed by auto oxidation by reacting free radicals generated from the cleaved bond with oxygen in the atmosphere. In this auto oxidation reaction, crosslinks were generated where bonded to each other, and the mobility of molecules was decreased, and as a result, the fluoroelastomer was hardened. This hardening behaviour occurred more significantly in the severe accident environment than in the normal operation condition, and it was found that thermal stability decreased with the generation of unstable structures by crosslinking.

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