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用熔融共混和热压工艺制备了CB/HDPE,MWNT/HDPE聚合物基复合材料,研究了填料体积含量,测试电压,填料形貌尺寸对复合体系介电性能的影响。实验表明,当导电填料含量达到渗流阈值附近时复合材料的介电常数达到最大,测试电压达到一定值时,渗流阈值附近的复合材料介电损耗会迅速增加,相同填料体积含量的MWNT/HDPE复合体系比CB/HDPE体系具有更高的介电常数,利用渗流理论、Maxwell-Wagner界面极化效应和微电容模型解释了实验现象。
The composites of CB / HDPE and MWNT / HDPE were prepared by melt blending and hot pressing. The effects of filler volume, test voltage and filler morphology on the dielectric properties of the composites were investigated. The experimental results show that when the content of conductive filler reaches the percolation threshold, the dielectric constant of the composite reaches its maximum. When the test voltage reaches a certain value, the dielectric loss of the composite near the percolation threshold increases rapidly. The MWNT / HDPE composite with the same filler volume content The system has a higher dielectric constant than the CB / HDPE system. The experimental phenomena are explained by the seepage theory, the Maxwell-Wagner interface polarization effect and the micro-capacitance model.