Positive temperature coefficient effect of LMWPE–UHMWPE blends filled with short carbon fibers

Composites of ultra-high molecular weight polyethylene (UHMWPE), low molecular weight polyethylene (LMWPE) and carbon fibers (CF) were prepared by gelation/crystallization from solution. The maximum intensity of PTC (positive temperature coefficient), the magnitude being ca. 9 orders, was found for...

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Bibliographic Details
Published in:Carbon (New York) 2004, Vol.42 (8), p.1699-1706
Main Authors: Xi, Ying, Ishikawa, Hisako, Bin, Yuezhen, Matsuo, Masaru
Format: Article
Language:English
Subjects:
A. Carbon fibers, Resins
B. Mixing
Cross-disciplinary physics: materials science
rheology
D. Electrical properties
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
Materials science
Physics
Specific materials
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Summary:Composites of ultra-high molecular weight polyethylene (UHMWPE), low molecular weight polyethylene (LMWPE) and carbon fibers (CF) were prepared by gelation/crystallization from solution. The maximum intensity of PTC (positive temperature coefficient), the magnitude being ca. 9 orders, was found for a LMWPE/UHMWPE composition of 9/1 containing 23.5 vol% CF, i.e. a much higher amount of the filler than in the percolation threshold (12–15 vol%). The elimination of the NTC (negative temperature coefficient) effect and a good reproducibility were achieved by using UHMWPE as one of the composite components because of its very high viscosity.
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2004.02.027