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 proceedingConference 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 languageEnglish
    Title of host publicationProceedings of the IEEE International Conference on Properties and Applications of Dielectric Materials
    PublisherInstitute of Electrical and Electronics Engineers Inc.
    Pages544-547
    Number of pages4
    Volume2015-October
    ISBN (Print)9781479989034
    DOIs
    Publication statusPublished - 2015 Oct 8
    Event11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015 - Sydney, Australia
    Duration: 2015 Jul 192015 Jul 22

    Other

    Other11th IEEE International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2015
    CountryAustralia
    CitySydney
    Period15/7/1915/7/22

    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

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  • 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). [7295329] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ICPADM.2015.7295329