Surface-modification effect of MgO nanoparticles on the electrical properties of polypropylene nanocomposite

High Voltage

Wei Wang¹  Shixun Hu¹  Yao Zhou²  Jun Hu²  Qi Li²  Chao Yuan²  Jinliang He² 

[1] Beijing Key Lab of High Voltage & EMC, and State Key Lab of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University;State Key Laboratory of Power Systems, Tsinghua University;

关键词: electrical resistivity;    surface treatment;    insulating materials;    nanocomposites;    electric breakdown;    nanoparticles;    filled polymers;    space charge;    magnesium compounds;    surface-modification effect;    mgo nanoparticles;    electrical properties;    polypropylene nanocomposite;    coupling agent;    alkyl chain groups;    surface-modified nanoparticles;    deep traps;    alkyl chain length;    dc volume resistivity;    remarkable space charge suppression ability;    octyl-modified mgo;    pp-based nanocomposite insulation material;    hvdc cable;    dc breakdown strength;    space charge suppression ability;    mgo;   

DOI  :  10.1049/hve.2019.0159

来源: DOAJ

【 摘 要 】

Polypropylene (PP)-based nanocomposite is a promising insulation material for recyclable high-voltage direct current (HVDC) cables, where the coupling agent plays an important role. In this study, four silane coupling agents with different alkyl chain groups (methyl, propyl, octyl, and octadecyl) were used to surface-modify magnesium oxide (MgO) nanoparticles. The surface-modification effect on the electrical properties of PP/MgO nanocomposites was investigated. The results show that surface-modified nanoparticles introduce quantities of deep traps, whose quantity increases as the alkyl chain length increases. The similar tendency also occurs on DC volume resistivity. All these nanocomposites show remarkable space charge suppression ability and improved DC breakdown strength. Among them, the nanocomposites with octyl-modified MgO show the best electrical properties, which could be attributed to the introduction of a large quantity of deep traps. The work may give a reference for the selection of coupling agents in PP-based nanocomposite insulation material for HVDC cable.

【 授权许可】

Unknown