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掺碳黑聚乙烯可制成PTC(正温度系数)材料,不但可以用来加热保温,而且材料本身具有自动控温的开关特性。掺碳黑聚乙烯的PTC特性已有研究。Kohler认为PTC现象产生是由于温度升到熔点时,聚合物体积增加,使导电碳黑——聚合物体积比减少,从而使聚乙烯碳黑复合物的电阻增加.Ohe提出PTC现象主要是由于电子跳过掺入的导电微粒间隙的难易程度所引起。Meyer假定聚合物中存在微晶薄片和非晶薄片,微晶薄片的导电性比非晶薄片好,而导电微粒处在微晶间的非晶区内,PTC现象就是由于这些微晶薄片状态改变所引起。作者
Carbon black doped carbon can be made of PTC (positive temperature coefficient) material, not only can be used to heat insulation, and the material itself has automatic temperature control switch characteristics. The PTC characteristics of carbon black-doped polyethylene have been studied. Kohler that PTC phenomenon is due to the temperature rises to the melting point, the polymer volume increases, the conductive carbon black - polymer volume ratio decreases, so that the resistance of the polyethylene carbon black composite increases.Ohe proposed PTC phenomenon is mainly due to the electronic Caused by the ease of skipping the gap of the conductive particles incorporated. Meyer Assuming that microcrystalline sheets and amorphous sheets are present in the polymer, the microcrystalline sheets are more conductive than amorphous sheets and the conductive particles are in an amorphous region between the crystallites. The PTC phenomenon is due to changes in the state of these microcrystalline sheets Caused. Author