Relation between morphology change due to mechanical kneading and dielectric breakdown characteristics in ethylene-styrene copolymers

Yasuhiro Tanaka, Toshinobu Otsubo, Yoshimichi Ohki, Masaaki Ikeda, Fumihiko Yazaki

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

The relation between morphological change, induced by copolymerized benzene rings or by kneading, and the dielectric strength of ethylene-styrene copolymer was studied. In unkneaded samples, the lamellar thickness decreases and the lattice constant along the a-axis increases with increasing styrene content. However, in kneaded samples, the lamellar thickness and the lattice constant remain constant up to a styrene content of 3.10 wt%. Spherulite is observed with a polarizing microscope in unkneaded samples, but it disappears in kneaded samples. Kneaded samples, especially the kneaded sample with a styrene content of 3.10 wt%, have higher breakdown strength than unkneaded samples. The styrene content of the sample showing the highest breakdown strength increases as the temperature decreases. At -50°C or -80°C, the sample with a styrene content of 15.40 wt% has the highest breakdown strength of all the samples. 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. This effect of benzene rings becomes pronounced in the low-temperature region where the breakdown process is electronic.

Original languageEnglish
Title of host publicationProc 3 Int Conf Prop Appl Dielectr Mater
PublisherPubl by IEEE
Pages1169-1172
Number of pages4
ISBN (Print)0879425687
Publication statusPublished - 1991 Dec 1
Externally publishedYes
EventProceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials - Tokyo, Jpn
Duration: 1991 Jul 81991 Jul 12

Publication series

NameProc 3 Int Conf Prop Appl Dielectr Mater

Other

OtherProceedings of the 3rd International Conference on Properties and Applications of Dielectric Materials
CityTokyo, Jpn
Period91/7/891/7/12

ASJC Scopus subject areas

  • Engineering(all)

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  • Cite this

    Tanaka, Y., Otsubo, T., Ohki, Y., Ikeda, M., & Yazaki, F. (1991). Relation between morphology change due to mechanical kneading and dielectric breakdown characteristics in ethylene-styrene copolymers. In Proc 3 Int Conf Prop Appl Dielectr Mater (pp. 1169-1172). (Proc 3 Int Conf Prop Appl Dielectr Mater). Publ by IEEE.