对掺杂了25份(phr)导电炭黑(CB)的样品进行了正电子湮灭寿命谱的变温测量,在玻璃化转变温度以上,随着温度的增加,自由体积的大小线性增加,在玻璃化转变温度以下,自由体积的大小基本不变.o-Ps的强度在-40℃下基本不变,从-40℃以上开始增加,但在50℃以上上升有加快的趋势.与PTC材料的PTC现象和导电性能有一定的关联.
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