화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.9, No.6, 635-639, November, 2003
Studies on the Effect of γ-Irradiation and Antioxidants on PTC Characteristics of Conductive Carbon Black-Filled Polyethylene Composites
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Effect of irradiation and antioxidants on PTC (positive temperature coefficient) characteristics of a conductive carbon black (CB)/high density polyethylene (HDPE) composite was investigated. HDPE with a melt index of 0.35 was selected as the polymer matrix in this work. CB with an average particle size 86 nm was used. The CB/HDPE composites were irradiated with γ rays to a dosage of 60-180 kGy to examine the behavior of the Negative Temperature Coefficient (NTC) of the conductive composite. Various types of anti-oxidants were added into the CB/HDPE to stabilize the composites against thermo-oxidative degradation. The electrical properties of CB/HDPE composites were examined to determine the effect of antioxidants on the degradation of polymer. Radiation crosslinking reduced the NTC effect of the CB filled HDPE above its melting point. For samples blended with Irganox 1076 and Ultranox 626, the resistivity change according to thermal aging time was lower than that of composite without antioxidant. It was found that the peak resistivity of the compositions depended on the time of thermal aging treatment and the presence of antioxidants.
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