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Electrical properties of carbon black filled polyethylene
Author(s) -
Narkis M.,
Ram A.,
Flashner F.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760180808
Subject(s) - carbon black , polyethylene , materials science , reproducibility , carbon fibers , dielectric , intensity (physics) , electrical resistivity and conductivity , melting temperature , analytical chemistry (journal) , composite material , organic chemistry , chemistry , natural rubber , chromatography , electrical engineering , optics , physics , optoelectronics , composite number , engineering
Resistivity and dielectric constant of polyethylene/carbon black compounds were measured from room temperature to 140°C. Within the polyethylene melting region a PTC/NTC (positive followed by negative temperature coefficients) phenomenon is observed, whose intensity depends on the type of carbon black, its concentration and other parameters. Reproducibility of the PTC phenomenon in polyethylene compounds containing a single type of carbon black is rather low. However, by using mixtures of carbon blacks differing appreciably in their particle size, remarkable reproducibility improvements can be achieved. Several other aspects are also discussed in the present paper covering current‐voltage relationships in these materials, comparison of PTC curves with DSC thermograms upon heating and cooling, and dielectric constant‐temperature relations. The carbon black concentration giving the optimum PTC intensity can be predicted approximately from room temperature data.