Abstract
Composite particles with ultra-high molecular polyethylene (UHMWPE) core and carbon nanotube (CNT) shell were produced by an impact coating process, and molded into conductive polymer composites. Morphology of these composite particles was observed and the electrical behavior of these molded composites was measured. UHMWPE particles were very well coated by CNT, and conductive networks of CNT were formed after molding. These conductive polymer composites with low loadings of conductive filler exhibit lower room-temperature resistivity, and volume resistivity decreases with temperature on the whole. This is because of the CNT distribution is uniform in a macroscopic view but is oriented in a mesoscopic view. Thermionic emission of CNT is strong in polymer composites produced by this process. A related mechanism is discussed.
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