Effects of addition of MgO fillers with various sizes and co-addition of nano-sized SiO2 fillers on the dielectric properties of epoxy resin

Ryosuke Yanashima, Naoshi Hirai, Yoshimichi Ohki

研究成果: Conference contribution

12 被引用数 (Scopus)

抄録

Complex permittivity (ϵr' and ϵr"), conductivity (σ), and glass transition temperature (Tg) were measured for composites of epoxy resin and MgO fillers with various sizes in a wide temperature and frequency range. The effect of coaddition of nano-sized SiO2 was also examined. It has become clean that Tg decreases by the addition of MgO fillers, and its decrement becomes more with a decrease in filler size. Moreover, Tg decreases if the silica nanofillers are co-added. However, all the three important parameters for electrical insulation ability of polymers, namely ϵr', ϵr", and σ, decrease with the decrease in size of MgO fillers or by the addition of silica nanofillers at high temperatures and low frequencies. This is a very astonishing result, since it seems reasonable that a polymer with a high Tg should have a better insulating ability. Probably, the above-mentioned results indicate that the charge transport becomes more difficult, presumably resulting from the suppression of molecular motion with the decrease in size of MgO fillers and by the co-addition of SiO2 nanofillers. This indicates that the suppression of molecular motion becomes very strong if the filler size is small, making the carrier transport difficult even in polymers with low Tg.

本文言語English
ホスト出版物のタイトルProceedings of 2017 International Symposium on Electrical Insulating Materials, ISEIM 2017
出版社Institute of Electrical Engineers of Japan
ページ650-653
ページ数4
2
ISBN(電子版)9784886860996
DOI
出版ステータスPublished - 2017 12月 4
イベント2017 International Symposium on Electrical Insulating Materials, ISEIM 2017 - Toyohashi, Japan
継続期間: 2017 9月 112017 9月 15

Other

Other2017 International Symposium on Electrical Insulating Materials, ISEIM 2017
国/地域Japan
CityToyohashi
Period17/9/1117/9/15

ASJC Scopus subject areas

  • 電子工学および電気工学
  • 電子材料、光学材料、および磁性材料

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