Electrical conduction and dielectric relaxation in polyethylene terephthalate succinate

Fukutaro Kato, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    Electrical conduction and complex permittivity are examined in polyethylene terephthalate succinate, focusing on their relations to dielectric relaxation processes. Both the real and imaginary parts of the complex permittivity, namely, the dielectric constant έr and the dielectric loss factor εr, increase with a decrease in frequency, especially at high temperatures. They are both ascribed to the transport of ionic mobile carriers. Namely, the carrier transport forms a conduction current that should contribute to εr. On this occasion, if charge exchange does not occur at the two electrodes, heterocharge layers should be formed before the electrodes. This should increase the charge density on the electrodes, thus contributing to έr. In addition to the increase in έr and εr due to mobile ions, two relaxation processes, one due to micro-Brownian motion of dipoles and the other due to orientation and magnitude change of the dipole moment induced by two end groups in the polymer main chain, are observed. Corresponding to these two relaxation processes, two thermally stimulated discharge current (TSDC) peaks appear. The two TSDC peaks as well as the increments in έr and εr become larger when the crystallinity of the sample decreases.

    Original languageEnglish
    Pages (from-to)1-8
    Number of pages8
    JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
    Volume170
    Issue number4
    DOIs
    Publication statusPublished - 2010

    Fingerprint

    Dielectric relaxation
    Relaxation processes
    Polyethylene terephthalates
    Permittivity
    Electrodes
    Carrier transport
    Brownian movement
    Dipole moment
    Dielectric losses
    Charge density
    Ions
    Polymers
    Temperature

    Keywords

    • Complex permittivity
    • Polyethylene terephthalate succinate
    • Thermally stimulated discharge current

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering
    • Energy Engineering and Power Technology

    Cite this

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    abstract = "Electrical conduction and complex permittivity are examined in polyethylene terephthalate succinate, focusing on their relations to dielectric relaxation processes. Both the real and imaginary parts of the complex permittivity, namely, the dielectric constant έr and the dielectric loss factor εr, increase with a decrease in frequency, especially at high temperatures. They are both ascribed to the transport of ionic mobile carriers. Namely, the carrier transport forms a conduction current that should contribute to εr. On this occasion, if charge exchange does not occur at the two electrodes, heterocharge layers should be formed before the electrodes. This should increase the charge density on the electrodes, thus contributing to έr. In addition to the increase in έr and εr due to mobile ions, two relaxation processes, one due to micro-Brownian motion of dipoles and the other due to orientation and magnitude change of the dipole moment induced by two end groups in the polymer main chain, are observed. Corresponding to these two relaxation processes, two thermally stimulated discharge current (TSDC) peaks appear. The two TSDC peaks as well as the increments in έr and εr become larger when the crystallinity of the sample decreases.",
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    AU - Ohki, Yoshimichi

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    AB - Electrical conduction and complex permittivity are examined in polyethylene terephthalate succinate, focusing on their relations to dielectric relaxation processes. Both the real and imaginary parts of the complex permittivity, namely, the dielectric constant έr and the dielectric loss factor εr, increase with a decrease in frequency, especially at high temperatures. They are both ascribed to the transport of ionic mobile carriers. Namely, the carrier transport forms a conduction current that should contribute to εr. On this occasion, if charge exchange does not occur at the two electrodes, heterocharge layers should be formed before the electrodes. This should increase the charge density on the electrodes, thus contributing to έr. In addition to the increase in έr and εr due to mobile ions, two relaxation processes, one due to micro-Brownian motion of dipoles and the other due to orientation and magnitude change of the dipole moment induced by two end groups in the polymer main chain, are observed. Corresponding to these two relaxation processes, two thermally stimulated discharge current (TSDC) peaks appear. The two TSDC peaks as well as the increments in έr and εr become larger when the crystallinity of the sample decreases.

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