Electrical and lechanical
Properties of Surface Fluorinated Carbon Black Filled Polymer Composite
Arinobu Katada
Department of Chemistry and Materials Science, Tokyo Institute of Technology,TokyoJapan
Tomohiro Isogai
Daikin Industries, Ltd.
Masao Sumita
Department of Chemistry and Materials Science, Tokyo Institute of Technology,TokyoJapan
Nippon Gomu Kyokaishi,(2003),76(10), 375-380
General Review in Japanese.
Abstract
The effect of surface fluorination
of carbon black (CB) on the electrical and mechanical properties of CB
filled polymer composite was studied in this work. By immersion heat measurement,
it was found that the London dispersive component
of surface energy significantly decreased with increasing the fluorine
content, while the polar component
slightly increased. The resistivity measurement of fluorinated CB filled
resin composite showed that by increasing the fluorine content, the percolation
threshold increased, and transition from insulated state to conductive
state was decelerated. The dynamic mechanical analysis (DMA) of epiclorohydrin-ethylene
oxide-allylglycidyl ether (CHR) filled fluorinated CB composite illustrated
that the interfacial interaction parameter (B) and immobilized
polymer layer thickness ( R)
decreased with increasing the fluorine content. The Maxwell-Wagner-Sillars
(MWS) relaxation peak accompanied by migration of the charge carriers
accumulated at interface between CHR and CB was observed at higher than
glass transition temperature (Tg) of CHR. The activation energy (EaMWS)
of MWS relaxation was decreased with increasing the fluorine content.
It was found that B and R
estimated from DMA was well agreed with the EaMWS
estimated from dielectric measurement.
Keywords:
Polymer composite, Fluorinated carbon black, Immersion enthalpy, Percolation,
MWS relaxation |