Effect of nanoparticle surface modification on charge transport characteristics in XLPE/SiO₂ nanocomposites

Abstract

This paper focuses on the effect of nanoparticle surface modification on the charge transport characteristics in XLPE/SiO 2 nanocomposites. A titanate coupling agent (TC9) and a 3-(Methacryloyloxy)propyltrimethoxysilane (KH570) were used for the surface modification of SiO 2 nanoparticles. It was found that both KH570 and TC9 coupling agents improve the nanoparticle dispersion compared with unmodified SiO 2 nanoparticles. The improvement in dispersion was found to be due to increased surface hydrophobicity of the treated SiO 2 nanoparticles. In addition, it was found that the surface modification improved the DC conductivity, dielectric characteristics, and space charge properties as compared to XLPE or XLPE/SiO 2 nanocomposites without surface modification. The results of the TSC measurements showed that the introduction of SiO 2 nanoparticles into XLPE increased the trap density and produced more trap energy levels. Improving the nanoparticle dispersion was found to further increase the corresponding trap depth and trap density. The trapped homocharge formed an independent electric field and reduced the effective electric field, which reduced charge injection and increased the charge injection barrier height. Therefore, the space charge formation in the material bulk was suppressed.

Investigation of the electrical properties of XLPE/SiC nanocomposites

“…Since T. J. Lewis [11] first proposed the concept of nanodielectrics in 1994, polyethylene-based nanocomposites have developed from LDPE nanocomposites to XLPE nanocomposites. It has been demonstrated that XLPE nanocomposites can improve electrical properties [12][13][14][15][16][17]. The interface in nanocomposites between the polymer matrix and nanoparticles is the main reason for the improvement in the electrical properties [18][19][20][21][22][23][24].…”

Effect of Ionic Conductors on the Suppression of PTC and Carrier Emission of Semiconductive Composites

“…Until recently, most studies have been limited to the insulation nano-doped polyethylene, which has been attracting more and more attention. It has been reported that polyethylene-doped inorganic nanoparticles such as MgO, ZnO and SiO 2 can significantly suppress the accumulation of space charge in the insulation [21][22][23][24][25]. Some researchers add SrFe 16 O 19 to the semiconductive layer to reduce the injection of space charge in the insulating layer by using the Lorentz force of magnetic particles on the charge [26].…”

Evaluation of polypropylene/polyolefin elastomer blends for potential recyclable HVDC cable insulation applications

“…Meanwhile, charges would be injected from the electrode into the material. The charges originating from above sources can be trapped and then space charge accumulation takes place [23]. Since the positive ion is heavier than the electron, the mobility of the positive ion is much lower than that of the electron with the same electricity under the same applied electric field.…”