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Positive temperature coefficient and time‐dependent resistivity of carbon nanotubes (CNTs)/ultrahigh molecular weight polyethylene (UHMWPE) composite
Author(s) -
Gao JieFeng,
Yan DingXiang,
Huang HuaDong,
Dai Kun,
Li ZhongMing
Publication year - 2009
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.30468
Subject(s) - materials science , carbon nanotube , composite number , percolation (cognitive psychology) , composite material , isothermal process , percolation threshold , electrical resistivity and conductivity , ultra high molecular weight polyethylene , temperature coefficient , electrical conductor , polyethylene , carbon black , thermodynamics , physics , engineering , neuroscience , electrical engineering , biology , natural rubber
The carbon nanotubes/ultrahigh molecular weight polyethlene (CNTs/UHMWPE) conductive composite with a low percolation threshold had been successfully fabricated, and CNTs were only dispersed in the interface of matrix particles. Some factors, including CNTs concentration, processing temperature, and the time of isothermal treatment, which could exert influence on the positive temperature coefficient effect of the composite, were investigated. Similar with negative temperature coefficient effect, the resistivity decreased during isothermal treatment above the melting point of UHMWPE, which could be thought to be a relaxation process originated from movement of molecular chains. This relaxation, also a process of CNTs aggregating to reorganize the conductive network, was testified as a function of time, temperature, filler concentration, and heating rate. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009