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Poly(ethylene terephthalate)/expanded graphite conductive composites: Structure, properties, and transport behavior
Author(s) -
Zhang Ming,
Li DaJun,
Wu DeFeng,
Yan ChangHao,
Lu Ping,
Qiu GuanMing
Publication year - 2008
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.27745
Subject(s) - materials science , composite material , percolation threshold , conductivity , graphite , percolation (cognitive psychology) , epoxy , electrical conductor , anisotropy , crystallization , electrical resistivity and conductivity , chemical engineering , chemistry , physics , quantum mechanics , neuroscience , electrical engineering , biology , engineering
Poly(ethylene terephthalate)/expanded graphite conductive composites were prepared by the melt‐blending method. The relationships between the preparation methods, microstructures, and conductivity properties of the composites were studied with scanning electron microscopy and conductivity measurements. The results showed that the composites presented a low percolation threshold and strong anisotropic conductivity. The epoxy resin had a strong intercalation effect on the expanded graphite that led to the easy formation of the conductive network. With classical statistical percolation theory, the conductivity behaviors of the composites were investigated. The results indicated that the nonuniversal critical exponent should be attributed to the anisotropy of conductivity, the tunneling conduction, and the particular structure. In addition, preliminary studies on the crystallization and dynamic mechanical behavior of the composites were performed. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci 2008