CAJ | 학술논문

利用机械球磨法制备了钛酸钡表面负载碳纳米管的复合颗粒BT-CNT，将其填充到聚偏二氟乙烯中制备了三相复合材料(BT-CNT/PVDF)，研究BT-CNT对该复合材料介电性能的影响。结果表明：随着BT-CNT质量分数的增加，复合材料的介电常数显著增加，而介质损耗及电导率仍保持在较低值，复合材料在BT-CNT质量分数为50%时未出现典型的渗流效应。介电常数的增加主要源于导电性CNT引起的界面极化，而长的CNT经机械球磨在BT表面形成较短的CNT片段，静电吸附于BT表面，难以在整个复合材料中形成导电性渗流网络。复合材料的介电常数随测试温度的升高而增大，这是由于温度升高导致更强烈的界面极化。
이용궤계구마법제비료태산패표면부재탄납미관적복합과립BT-CNT，장기전충도취편이불을희중제비료삼상복합재료(BT-CNT/PVDF)，연구BT-CNT대해복합재료개전성능적영향。결과표명：수착BT-CNT질량분수적증가，복합재료적개전상수현저증가，이개질손모급전도솔잉보지재교저치，복합재료재BT-CNT질량분수위50%시미출현전형적삼류효응。개전상수적증가주요원우도전성CNT인기적계면겁화，이장적CNT경궤계구마재BT표면형성교단적CNT편단，정전흡부우BT표면，난이재정개복합재료중형성도전성삼류망락。복합재료적개전상수수측시온도적승고이증대，저시유우온도승고도치경강렬적계면겁화。
Composite particles (BT-CNT), which was carbon nanotube(CNT) supported on the BaTiO3(BT) surface, were prepared through mechanical ball milling method, and a three-phase composite BT-CNT/PVDF was prepared by filling the BT-CNT into poly(vinylidene fluoride) (PVDF). The effect of BT-CNT on the dielectric properties of the composites was studied. The results show that with the increase of the mass fraction of BT-CNT, the dielectric constant of the composite increases obviously, and the dielectric loss and conductivity maintain at low value. No typical percolation effect is observed for the composites even when the mass fraction of BT-CNT reaches 50%. The increase of dielectric constant mainly derives from the interfacial polarization caused by the electrical conductive CNT. The long CNT is broken into short CNT pieces after mechanical ball milling process and then is absorded to the BT surface through electrostatic attraction, thus it is hard to form conductive percolation network in the whole composite. The dielectric constant increases with the increase of temperature because high temperature would lead to stronger interfacial polarization.