Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer

Marina Komatsu; Tomoyuki Izutsu; Yoshimichi Ohki; Maya Mizuno; Kaori Fukunaga

doi:10.1109/ICPADM.2015.7295329

Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer

Marina Komatsu, Tomoyuki Izutsu, Yoshimichi Ohki, Maya Mizuno, Kaori Fukunaga

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

5 Citations (Scopus)

Abstract

Flame-retardant ethylene-propylene-diene copolymer, which is the polymer insulating material most abundantly used for safety-related electric cables in nuclear power plants, was irradiated with gamma-rays to certain designated doses from 500 to 1500 kGy at room temperature or 100 °C in air, and absorption spectra were measured at terahertz frequencies. A broad absorption is induced by the irradiation in a range from 0.5 to 3.1 THz. It is confirmed that this absorption is induced by oxidation, by comparing its frequency spectrum with spectra of polyethylene obtained numerically by doing quantum chemical calculations and experimentally by measuring its absorption at THz frequencies. Therefore, the degree of oxidation of this copolymer can be estimated by the intensity of the broad absorption at these THz frequencies.

Original language	English
Title of host publication	Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	544-547
Number of pages	4
Volume	2015-October
ISBN (Print)	9781479989034
DOIs	https://doi.org/10.1109/ICPADM.2015.7295329
Publication status	Published - 2015 Oct 8
Event	11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015 - Sydney, Australia Duration: 2015 Jul 19 → 2015 Jul 22

Other

Other	11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015
Country/Territory	Australia
City	Sydney
Period	15/7/19 → 15/7/22

Keywords

cable insulation
cross-linking
EPDM
gamma-irradiation
oxidation
Terahertz spectroscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Materials Chemistry
Condensed Matter Physics

Access to Document

10.1109/ICPADM.2015.7295329

Cite this

Komatsu, M., Izutsu, T., Ohki, Y., Mizuno, M., & Fukunaga, K. (2015). Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer. In Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials (Vol. 2015-October, pp. 544-547). Article 7295329 Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPADM.2015.7295329

Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer. / Komatsu, Marina; Izutsu, Tomoyuki; Ohki, Yoshimichi et al.
Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials. Vol. 2015-October Institute of Electrical and Electronics Engineers Inc., 2015. p. 544-547 7295329.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Komatsu, M, Izutsu, T, Ohki, Y, Mizuno, M & Fukunaga, K 2015, Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer. in Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials. vol. 2015-October, 7295329, Institute of Electrical and Electronics Engineers Inc., pp. 544-547, 11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015, Sydney, Australia, 15/7/19. https://doi.org/10.1109/ICPADM.2015.7295329

Komatsu M, Izutsu T, Ohki Y, Mizuno M, Fukunaga K. Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer. In Proceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials. Vol. 2015-October. Institute of Electrical and Electronics Engineers Inc. 2015. p. 544-547. 7295329 doi: 10.1109/ICPADM.2015.7295329

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abstract = "Flame-retardant ethylene-propylene-diene copolymer, which is the polymer insulating material most abundantly used for safety-related electric cables in nuclear power plants, was irradiated with gamma-rays to certain designated doses from 500 to 1500 kGy at room temperature or 100 °C in air, and absorption spectra were measured at terahertz frequencies. A broad absorption is induced by the irradiation in a range from 0.5 to 3.1 THz. It is confirmed that this absorption is induced by oxidation, by comparing its frequency spectrum with spectra of polyethylene obtained numerically by doing quantum chemical calculations and experimentally by measuring its absorption at THz frequencies. Therefore, the degree of oxidation of this copolymer can be estimated by the intensity of the broad absorption at these THz frequencies.",

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N2 - Flame-retardant ethylene-propylene-diene copolymer, which is the polymer insulating material most abundantly used for safety-related electric cables in nuclear power plants, was irradiated with gamma-rays to certain designated doses from 500 to 1500 kGy at room temperature or 100 °C in air, and absorption spectra were measured at terahertz frequencies. A broad absorption is induced by the irradiation in a range from 0.5 to 3.1 THz. It is confirmed that this absorption is induced by oxidation, by comparing its frequency spectrum with spectra of polyethylene obtained numerically by doing quantum chemical calculations and experimentally by measuring its absorption at THz frequencies. Therefore, the degree of oxidation of this copolymer can be estimated by the intensity of the broad absorption at these THz frequencies.

AB - Flame-retardant ethylene-propylene-diene copolymer, which is the polymer insulating material most abundantly used for safety-related electric cables in nuclear power plants, was irradiated with gamma-rays to certain designated doses from 500 to 1500 kGy at room temperature or 100 °C in air, and absorption spectra were measured at terahertz frequencies. A broad absorption is induced by the irradiation in a range from 0.5 to 3.1 THz. It is confirmed that this absorption is induced by oxidation, by comparing its frequency spectrum with spectra of polyethylene obtained numerically by doing quantum chemical calculations and experimentally by measuring its absorption at THz frequencies. Therefore, the degree of oxidation of this copolymer can be estimated by the intensity of the broad absorption at these THz frequencies.

KW - cable insulation

KW - cross-linking

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KW - gamma-irradiation

KW - oxidation

KW - Terahertz spectroscopy

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Terahertz spectroscopic observation of oxidation of ethylene-propylene-diene-copolymer

Abstract

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Keywords

ASJC Scopus subject areas

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