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聚合物基复合材料 ＰＴＣ转变区的电阻率突变与惨流曲线在临界体积分数附近的电阻率突变在导电机制上是同一的只要复合材料具有近似开关性质的渗流导电特性，室温下填料的体积分数决定ＰＴＣ转变温度及ＰＴＣ转变点的温度系数
The resistivity abrupt change in the PTC transition zone of polymer matrix composites is similar to that of the current curve in the vicinity of the critical volume fraction. The conductive mechanism is the same as long as the composite has the approximate on-off conductivity property. The volume fraction of the filler Determine the temperature coefficient of PTC transition temperature and PTC transition point