This study investigates the gamma radiation aging behavior of EPDM insulation material using dielectric spectroscopy and Fourier transform infrared (FTIR) analysis. Specimens were aged under dose rates of 50.3,860, and 1930 ~Gy / h at room temperature, as well as under a combined radiationthermal condition (820 ~Gy / h at 70° C), with periodic sampling. Dielectric measurements show that, under all conditions, tan δ at 100 kHz monotonically increases with accumulated dose, indicating its potential as a general aging indicator. FTIR results found that oxidative degradation occurs primarily through the formation of metal carboxylates, evidenced by the raised absorbance at 1 6 5 1 ~ c m- 1. Low dose rates tend to promote more uniform oxidation during prolonged radiation aging. Notably, the trends in dielectric and chemical properties exhibit a strong positive correlation, proving that δ at 100 kHz serves as a reliable and non-destructive technique for evaluating radiationinduced aging in polymeric insulation.
Jin, J., Suraci, S.V., Fabiani, D. (2025). Evolution of Electrical Properties Due to Combined Effects of Radiation and High Temperature Aging on EPDM Insulation Systems. Institute of Electrical and Electronics Engineers Inc. [10.1109/CEIDP61707.2025.11218337].
Evolution of Electrical Properties Due to Combined Effects of Radiation and High Temperature Aging on EPDM Insulation Systems
Jin J.;Suraci S. V.;Fabiani D.
2025
Abstract
This study investigates the gamma radiation aging behavior of EPDM insulation material using dielectric spectroscopy and Fourier transform infrared (FTIR) analysis. Specimens were aged under dose rates of 50.3,860, and 1930 ~Gy / h at room temperature, as well as under a combined radiationthermal condition (820 ~Gy / h at 70° C), with periodic sampling. Dielectric measurements show that, under all conditions, tan δ at 100 kHz monotonically increases with accumulated dose, indicating its potential as a general aging indicator. FTIR results found that oxidative degradation occurs primarily through the formation of metal carboxylates, evidenced by the raised absorbance at 1 6 5 1 ~ c m- 1. Low dose rates tend to promote more uniform oxidation during prolonged radiation aging. Notably, the trends in dielectric and chemical properties exhibit a strong positive correlation, proving that δ at 100 kHz serves as a reliable and non-destructive technique for evaluating radiationinduced aging in polymeric insulation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
