【摘 要】
：
The influence of mold pressing parameters on the positive temperature coefficient of high-density polyethylene/carbon black composites was investigated. The com
【机 构】
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State Key Laboratory of Mold Technology,College of Chemistry and Enviorment Engineering
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The influence of mold pressing parameters on the positive temperature coefficient of high-density polyethylene/carbon black composites was investigated. The composites with a low resistivity at room temperature and a high positive temperature coefficient can be obtainee with the mold pressing parameters as follows: mold pressing pressure 6-14MPa, mold pressing temperature 150-170℃, mold pressing time about 15min, and room temperature of molded specimen after cooling for 20-60 minutes. The positive temperature coefficient effect of the composite is 7.7 when it is prepared under the mold pressing parameters, and the negative temperature coefficient effect is less than 0.8. Scanning electron microscopy (SEM) reveals some aggregations of carbon black particles with a size of 1μm inside the composite, which was obtained at the mold pressing temperature of 180℃.
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