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Temperature dependence of the conductivity behavior of graphite nanoplatelet‐filled epoxy resin composites
Author(s) -
Zheng Chao,
Fan Zhuangjun,
Wei Tong,
Luo Guilian
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.30009
Subject(s) - percolation threshold , composite material , materials science , composite number , microstructure , epoxy , graphite , electrical resistivity and conductivity , percolation (cognitive psychology) , electrical conductor , thermal expansion , thermal conductivity , neuroscience , electrical engineering , biology , engineering
In this article, epoxy/graphite nanoplatelet (GNP) conductive composites with the low percolation threshold of ∼ 0.5 vol % were prepared. The effect of microstructure, particularly the spatial distribution of fillers in the matrix on the resistivity and its dependence on temperature, also was investigated. It is suggested that the high aspect ratio and good distribution of GNPs in the matrix contribute to the low threshold of the composite. The thermal–electrical behavior of the composite is also significantly influenced by the GNP content and microstructure of the composite. When the GNP content is greater than percolation threshold, a noticeable positive temperature coefficient of resistivity disappears. It is explained by the unique conductive network formed by plane contact between GNPs, which is hardly affected by the expansion of matrix during heating. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009