Dielectric properties of poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate)

Peng Yang, Fuqiang Tian, Yoshimichi Ohki

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    Dielectric behavior was compared experimentally between polyethylene terephthalate (PET) and poly(ethylene 2,6-naphthalate) (PEN). Due to their similar chemical structures, the two polymers exhibit many parallel dielectric properties. While the two polymers exhibit fairly similar thermally stimulated polarization and depolarization currents (TSPC and TSDC), the temperature at which TSPC or TSDC starts to increase rapidly is about 20 °C higher in PEN than in PET, mostly likely reflecting the difference in their glass transition temperatures (Tg's). At temperatures about 30 °C lower than Tg, the two polymers show a hump in their first-run TSPC spectra, probably originating from impurity or moisture. Both the real and imaginary parts of complex permittivity, εr' and εr", increase significantly at temperatures above their Tg's for both PEN and PET, since molecular motion becomes active. Shoulders and plateaux clearly appear in εr' and εr" spectra of PEN, which move toward higher frequencies with an increase in temperature. To further analyze them, complex electric modulus M∗ was introduced. As a result, it has become clear that electric conduction dominates the dielectric behavior of PET and PEN at temperatures above Tg, especially at low frequencies.

    Original languageEnglish
    Article number6927361
    Pages (from-to)2310-2317
    Number of pages8
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume21
    Issue number5
    DOIs
    Publication statusPublished - 2014 Oct 1

    Fingerprint

    Dielectric properties
    Polyethylene terephthalates
    Ethylene
    Polymers
    Temperature
    Depolarization
    Permittivity
    Moisture
    Impurities
    Polarization

    Keywords

    • dielectric property
    • electric modulus
    • polyethylene naphthalate
    • Polyethylene terephthalate

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

    Cite this

    Dielectric properties of poly(ethylene terephthalate) and poly(ethylene 2,6-naphthalate). / Yang, Peng; Tian, Fuqiang; Ohki, Yoshimichi.

    In: IEEE Transactions on Dielectrics and Electrical Insulation, Vol. 21, No. 5, 6927361, 01.10.2014, p. 2310-2317.

    Research output: Contribution to journalArticle

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