Morphology of ethylene-styrene copolymers and its effect on dielectric strength

Yasuhiro Tanaka, Yoshimichi Ohki, Masaaki Ikeda

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    The relation between morphological change, induced by copolymerized benzene rings or by kneading, and the dielectric strength of ethylene-styrene random copolymer was studied. Random distribution of styrene in the copolymer was confirmed by 13C Fourier-transform nuclear magnetic resonance (NMR). With increasing the styrene content of the unkneaded copolymer, the crystallinity, the size of the spherulite and the lamellar thickness decrease, while the lattice constant increases. However, in kneaded samples, the lamellar thickness and the lattice constant remain unchanged up to the styrene content of 3.10 wt%. Styrene content of the sample showing the highest dielectric strength increases as the temperature decreases. It is considered that the effect of benzene rings, which hinder the acceleration of electrons, becomes pronounced in the low temperature region where the breakdown process is electronic. Kneaded samples, especially the kneaded sample with the stryene content of 3.10 wt%, have higher dielectric strength than unkneaded samples of the same styrene content. It is considered that benzene rings are moved to the interfacial region between lamellar and amorphous parts by kneading and hinder the acceleration of electrons along the lamellae more effectively.

    Original languageEnglish
    Pages (from-to)432-439
    Number of pages8
    JournalIEEE Transactions on Electrical Insulation
    Volume27
    Issue number2
    Publication statusPublished - 1992 Jun

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    Styrene
    Ethylene
    Copolymers
    Benzene
    Lattice constants
    Electrons
    Fourier transforms
    Nuclear magnetic resonance
    Temperature

    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Morphology of ethylene-styrene copolymers and its effect on dielectric strength. / Tanaka, Yasuhiro; Ohki, Yoshimichi; Ikeda, Masaaki.

    In: IEEE Transactions on Electrical Insulation, Vol. 27, No. 2, 06.1992, p. 432-439.

    Research output: Contribution to journalArticle

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    abstract = "The relation between morphological change, induced by copolymerized benzene rings or by kneading, and the dielectric strength of ethylene-styrene random copolymer was studied. Random distribution of styrene in the copolymer was confirmed by 13C Fourier-transform nuclear magnetic resonance (NMR). With increasing the styrene content of the unkneaded copolymer, the crystallinity, the size of the spherulite and the lamellar thickness decrease, while the lattice constant increases. However, in kneaded samples, the lamellar thickness and the lattice constant remain unchanged up to the styrene content of 3.10 wt{\%}. Styrene content of the sample showing the highest dielectric strength increases as the temperature decreases. It is considered that the effect of benzene rings, which hinder the acceleration of electrons, becomes pronounced in the low temperature region where the breakdown process is electronic. Kneaded samples, especially the kneaded sample with the stryene content of 3.10 wt{\%}, have higher dielectric strength than unkneaded samples of the same styrene content. It is considered that benzene rings are moved to the interfacial region between lamellar and amorphous parts by kneading and hinder the acceleration of electrons along the lamellae more effectively.",
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