Electrical resistance behavior of vinylester composites filled with glass-carbon hybrid fibers |
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Authors: | Jun Wang Lianmeng Zhang Renxin Xu Huajun Duan Xiaoli Yang Xiang Wang |
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Affiliation: | (1) School of Materials Science and Engeering, Wuhan University of Technology, Wuhan, 430070, China |
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Abstract: | Vinylester (bismethacryloxy derivative of a bisphenol-A type EP resin, VE) composites with glass-carbon hybrid fibers (CF-GF)
weight fraction of 50%, were prepared by the compress molding method. The distribution of carbon fiber in the hybrids was
observed by stereomicroscope. The electrical resistance behavior of the composites filled with different carbon fiber (CF)
weight contents (0.5% to 20%) was studied. The experimental results show that the electrical resistance behaviors of CF-GF/VE
composites are different with those of CF/VE composites because carbon fibers’ conducting networks are broken by the glass
fibers in the CF-GF/VE composites. The carbon fibers distribute uniformly in the networks of glass fibers (GF) like single
silk and form the semi-continuous conducting networks. Composite filled with GF-CF hybrid has a higher percolation threshold
than that filled with pure CF. At that time, the resistivity of CF-GF/VE composites varies little with the temperature increasing.
The temperature coefficient of resistivity in GF-CF/VE composite is less than 317 ppm and the variation of the resistivity
after ten thermal cycles from 20 °C to 240 °C is less than 1.96%.
Funded by the Natural Science Foundation of Hubei Province (No. 2007ABA028) |
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Keywords: | conducting composite hybrid fibers resistivity-temperature coefficient synergy effect |
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