College of Mechanical and Electrical Engineering, Northeast Forestry University
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DOI:
10.7502/j.issn.1674-3962.2016.11.10
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Abstract:
Urea formaldehyde resin was selected as adhesive and worked with isocyanate resin to prepare carbon fiber enhanced woodiness composites (CFEWC) . In the preparation process, the mixture ratios of carbon fiber and wood fiber and the complex forms were altered. The related electrical properties of CFEWCs were studied. Besides, the reasons for the changes of electrical properties were also analyzed from different aspects. The results showed that both singlesided composites and doublesided composites could conduct electricity. Compared with singlesided CFEWC, doublesided composites had better electrical conductivity. The electrical conductivity of CFEWC improved with carbon fiber content increased while a certain condition prevails. Besides, the quantity of hole conduction and π electron increased. The surface resistivity represented a negative growth situation with increasing the temperature. A great many of conducting particles were motivated which led to a negative temperature coefficient (NTC) effect.