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High‐field conduction and carrier traps in polyethylene copolymerized with various monomers
Author(s) -
Ishino Iwao,
Hikita Masayuki,
Suzuoki Yasuo,
Mizutani Teruyoshi,
Ieda Masayuki
Publication year - 1992
Publication title -
electrical engineering in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.136
H-Index - 28
eISSN - 1520-6416
pISSN - 0424-7760
DOI - 10.1002/eej.4391120701
Subject(s) - materials science , polyethylene , monomer , thermal conduction , field (mathematics) , polymer chemistry , chemical engineering , composite material , polymer , engineering , mathematics , pure mathematics
Abstract The electrical breakdown and electrical conduction of ethylene copolymers have been studied. The electric strength of ethylene copolymers containing an optimum content of halogen moieties such as bromophenyl and fluoroethylene groups was found to be higher than that of LDPE over the wide temperature range from −196°C to 90°C. Also, conduction currents in the copolymers were suppressed at high electric fields. X‐ray‐induced thermally stimulated currents (TSC) revealed that halogen comonomers act as carrier traps with a depth of about 0.4 eV. Consequently, the introduction of comonomer‐containing halogen groups into polyethylene suppresses electron acceleration as a result of an increase in trapping and scattering of conduction electrons. This leads to an increase in electric strength which is determined by the electron avalanche breakdown.