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Electrical properties of carbon‐black grafted with polymers using an anionic catalyst
Author(s) -
Miyauchi Shin'Nosuke,
Sorimachi Yoshio,
Mitsui Masahiro,
Akihide Honma,
Ohkita Kumakazu
Publication year - 1984
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1984.070290123
Subject(s) - electrical resistivity and conductivity , resistor , carbon black , grafting , materials science , temperature coefficient , lithium (medication) , polymer chemistry , polymer , polymerization , carbon fibers , composite material , analytical chemistry (journal) , chemical engineering , chemistry , organic chemistry , medicine , natural rubber , composite number , electrical engineering , engineering , physics , quantum mechanics , voltage , endocrinology
The polymer‐grafted carbon black (GC) was prepared by an anionic polymerization of methyl methacrylate in the presence of carbon black previously treated with n ‐butyl lithium. The electrical properties of the resistors obtained using the GC material were studied. For a comparison with the above resistors, resistors with a smaller grafting ratio or without grafting were also prepared. It was found that the resistivity increased with an increase of the grafting ratio and that, by comparing resistors with similar resistivities, resistivity variation with temperature was less for higher grafting ratios. The resistors with a resistivity in the range of ca. 10 3 –10 6 Ω·cm showed a remarkably large positive anomaly, but, for a resistivity larger than 10 7 Ω·cm, the temperature coefficient was negative.