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Detection of Radiation Degradation of LDPE by ESR Spectroscopy  

Kim Ki-Yup (Korea Atomic energy Research Institute)
Lee Chung (Korea Atomic energy Research Institute)
Ryu Boo-Hyung (Department of Safety Engineering, Dongguk University)
Publication Information
Journal of the Korean Society of Safety / v.20, no.1, 2005 , pp. 81-86 More about this Journal
Abstract
This study has investigated radiation degradation of low density polyethylene(LDPE). Samples were irradiated up to 800kGy using a $Co^{60}\;\gamma-ray$ at a dose rate of 5kGy/hr in the presence of air atmosphere at room temperature. After irradiation, storing for 2 weeks, free radical measurement of LDPE has established by electron spin resonance(ESR). ESR measurement showed that free radical concentration(FRC) was increased with radiation dose and decreased with the time. The radical types showed alkyl, allyl, and peroxy radical with the irradiation, these changed to peroxy radical with the time.
Keywords
LDPE; irradiation; degradation; ESR;
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