Tree initiation characteristics of epoxy resin and epoxy/clay nanocomoposite

Stephanie Raetzke, Yoshimichi Ohki, Takahiro Imai, Toshikatsu Tanaka, Josef Kindersberger

研究成果: Article査読

54 被引用数 (Scopus)

抄録

Tree initiation behavior of an epoxy nanocomposite with 5 wt % nanoclay (layered silicate) was investigated for ac voltage in comparison to neat epoxy resin without fillers. To shorten the time for experiments, 600 Hz was used instead of 60 Hz, as acceleration for tree initiation had been confirmed at 10 kVrms and 14 kVrms between the two frequencies. V-t characteristics for tree initiation rather than tree growth to bridge the electrodes were obtained for conventional type of treeing specimens with an embedded steel needle subjected to voltages from 2 kVrms to 14 kVrms. As a result, it was clarified that tree initiation V-t characteristics were improved by approximately one order of magnitude for the epoxy/nanoclay composite compared to the neat epoxy resin. Initial formation of trees is generally considered to be directly related to the fatigue of matter stressed by electric ac fields at comparatively low field strength. Experimentally obtained prolongation of tree initiation time especially at low electric field can be ascribed to the suppression of such a fatigue through an interaction of injected electrons with nanoscale filler particles or interfaces between nanoscale filler particles and their surrounding polymer matrices. Mechanisms for improvement of time to tree initiation are discussed on the basis of the above concept including a multicore model that some of the authors have proposed.

本文言語English
論文番号5293962
ページ(範囲)1473-1480
ページ数8
ジャーナルIEEE Transactions on Dielectrics and Electrical Insulation
16
5
DOI
出版ステータスPublished - 2009 10

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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