Crystallinity of poly(ethylene naphthalate) and its relation to terahertz absorption

Daisuke Odaka, Yoshimichi Ohki, Maya Mizuno

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)


    The crystallinity of poly(ethylene naphthalate) (PEN) was changed by thermal annealing and its effects on terahertz absorption spectra and X-ray diffraction patterns were examined. As a result, the intensity of a relatively sharp absorption peak at around 2.2 THz was found to be proportional to the crystallinity. As a plausible cause of this absorption, a lattice vibration, a torsional vibration, or their combination mode associated with (010) planes in crystal α of PEN is proposed. Therefore, the crystallinity of PEN can be estimated from the intensity of this absorption.

    Original languageEnglish
    Article number032402
    JournalJapanese Journal of Applied Physics
    Issue number3
    Publication statusPublished - 2017 Mar 1

    ASJC Scopus subject areas

    • Engineering(all)
    • Physics and Astronomy(all)


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