화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.7, No.4, 199-203, July, 2001
The Effect of Carbon Black on PTC Characteristics of Conductive Polyethylene/Carbon Black Composite
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The effect of the carbon black structure on the PTC(positive temperature coefficient) characteristics of a conductive high density polyethylene/carbon black (HDPE/CB) composite was investigated. The HDPE/CB composite was irradiated with gamma rays to a dosage of 50 kGy, 100 kGy and 150 kGy for the purpose of reducing the NTC (negative temperature coefficient) of the conductive composite. It was found that the PTC intensity depended on the particle size, surface area and loading of the carbon black. The PTC intensity of HDPE/CB increased as the loading and surface area of the carbon black decreased. The electrical reproducibility of HDPE/CB was improved by radiation crosslinking compared with the unirradiated compound. The absence of the NTC effect in the crosslinked CB-filled polymer composites was related to an increase in the viscosity of the polymer matrix, thereby leading to a significant reduction in the mobility of the CB particles in the composites.
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