A new method for estimating the content of vinyl acetate in ethylene-vinyl acetate copolymer

Tomoyuki Izutsu, Daisuke Odaka, Marina Komatsu, Yoshimichi Ohki, Maya Mizuno, Yoshiaki Nakamura, Naofumi Chiwata

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    A new method for estimating the content of vinyl acetate (VA) in ethylene-vinyl acetate copolymer (EVA) is proposed. It is a kind of optical absorption spectroscopy in a frequency range from 0.5 to 21.0 THz. Comparison of absorption spectra among sheets of EVA with differing contents of VA from 12 to 60% by weight and a sheet of low-density polyethylene containing no VA revealed that the EVA sheets exhibit relatively sharp absorption at 2.5, 6.7, and 10.5 THz and rather broad absorption at 11 to 17 THz and 17 to 20 THz. All these absorption intensities are in proportion to the content of VA, up to certain contents, which enables us to estimate the content of VA in EVA quantitatively. Among them, the absorption at 2.5 THz measured by THz time-domain spectroscopy shows the best accuracy.

    Original languageEnglish
    Article number7534602
    Pages (from-to)1260-1265
    Number of pages6
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume23
    Issue number3
    DOIs
    Publication statusPublished - 2016 Jun 1

    Keywords

    • Dielectric materials
    • infrared spectroscopy
    • ISO
    • optical spectroscopy

    ASJC Scopus subject areas

    • Electrical and Electronic Engineering

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