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The influence of mold pressing parameters on the positive temperature coefficien t of high-density polyethylene/carbon black composites was investigated. The co mposites with a low resistivity at room temperature and a high positive temperat ure coefficient can be obtainee with the mold pressing parameters as follows: mo ld pressing pressure 6-14MPa, mold pressing temperature 150-170℃, mold pressi ng time about 15min, and room temperature of molded specimen after cooling for 2 0-60 minutes. The positive temperature coefficient effect of the composite is 7 .7 when it is prepared under the mold pressing parameters, and the negative temp erature coefficient effect is less than 0.8. Scanning electron microscopy (SEM) reveals some aggregations of carbon black particles with a size of 1μm inside t he composite, which was obtained at the mold pressing temperature of 180℃.
The influence of mold pressing parameters on the positive temperature coefficien t of high-density polyethylene / carbon black composites was investigated. The co mposites with a low resistivity at room temperature and a high positive temperat ure coefficient can be obtainee with the mold pressing parameters as The positive temperature coefficient effect of the composite is 7: the mold temperature is 150-170 ° C., the mold press time is about 15 min, and the room temperature of the molded specimen is after cooling for 20-60 minutes. .7 when it is prepared under the mold pressing parameters, and the negative temp erature coefficient effect is less than 0.8. Scanning electron microscopy (SEM) reveals some aggregations of carbon black particles with a size of 1 μm inside the he composite, which was obtained at the mold pressing temperature of 180 ° C.