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ID 30485
file
title alternative
Electrical Properties of Carbon Black-Graftpolymers Crosslinked with Epoxy Resin
creator
Miyauchi, Shinnosuke
Takada, Keiichi
Ohkita, Kumakazu
subject
カーボンブラック・グラフトポリマー
カーボンブラック
正の温度係数
NDC
Technology. Engineering
abstract
Resistors having different degrees of crosslinking were made by curing carbon black-graft polymers (grafted with n-butyl acrylate and acrylic acid) with an epoxy resin on porcelain plates, in order to obtain some information concerned with the effect of crosslinking on the large positive temperature coefficient of. electrical resistivity.

For the resistors prepared with the ratio 1/1 of carboxyl group/epoxy group, the gel fraction increased with increasing curing temperature or curing time, and therefore, the crosslinks increased. The volume resistivity decreased with increasing crosslinking and was in the range of 1-8Ωcm. The resistance temperature curves showed a distinct positive anomaly at about 80-100℃ attributable to volume expansion of polymer. The variation of resistance at 140℃ decreased with increasing crosslinking except for the samples which showed bad thermal stability against heating cycle between 40-140℃.

On the other hand, all the resistors made of polymer compositions having different ratios of carboxyl group/epoxy group and cured at 160℃ for 2 hr exhibited good thermal stability against heating cycle between 40-140℃, though their degrees of crosslinking were different. The least crosslinked resistor showed no anomaly of resistivity. It is considered that rearrangement of the carbon black network may occur toward lowering the resistance by static electric force in less crosslinked resistors.
journal title
材料
volume
Volume 28
issue
Issue 312
start page
894
end page
899
date of issued
1979-09-15
publisher
日本材料学会
issn
0514-5163
ncid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
社団法人日本材料学会
本文データは学協会の許諾に基づきCiNiiから複製したものである
relation url
relation is version of URL
http://ci.nii.ac.jp/naid/110002301169
department
Graduate School of Engineering