摘要
为研究聚丙烯(PP)的绝缘特性,将经过表面处理和未经过表面处理的不同质量分数纳米氧化镁(MgO)加入PP中,组成纳米MgO/PP复合材料。观察复合材料的微观结构,并对其分别进行交流击穿实验和介电谱测试。透射电子显微镜(TEM)实验观察到,纳米MgO在PP基体中分散均匀,未经表面处理的粒子出现部分团聚现象;击穿实验表明,在研究范围内,纳米MgO的添加能提高MgO/PP复合材料的交流击穿场强,且击穿场强随着所填充纳米MgO质量分数的增加而提高,纳米颗粒的表面处理过程也能提升相应组分的击穿场强;常温下的宽频介电谱实验显示,纳米填充物的加入能降低相对介电常数,其中经过表面处理的纳米MgO/PP复合材料降低幅度更大;介电温谱图显示,在较低温度(<60℃)下,PP和纳米MgO/PP复合材料的相对介电常数会随温度上升呈而增加,同时纳米MgO/PP相对介电常数低于纯PP。
In order to study the insulation characteristics of polypropylene(PP),different mass fractions of surface treated and non-surface treated nano-magnesia(MgO)were added to PP to form nano-MgO/PP composites.The microstructure of the composite was observed,and the AC breakdown experiment and dielectric spectrum test were carried out respectively.Transmission electron microscope(TEM)experiments observed that nano-MgO was uniformly dispersed in the PP matrix,while some agglomeration occurred in the particles that were not surface treated.The breakdown experiments showed that within the study range,the addition of nano-MgO enhanced the AC breakdown field strength of the MgO/PP composites,and the breakdown field strength increased with the increase in the mass fraction of nano-MgO filler.Additionally,the surface treatment process of the nanoparticles also improved the breakdown field strength of the corresponding components.The broadband dielectric spectroscopy experiments conducted at room temperature revealed that the incorporation of nano-fillers reduced the relative dielectric constant,with a larger reduction observed in the surface-treated nano-MgO/PP composites.The dielectric temperature spectrum showed that at lower temperatures(<60°C),the relative dielectric constant of both PP and nano-MgO/PP composites increased with rising temperature,while the relative dielectric constant of nano-MgO/PP was lower than that of pure PP.
作者
操卫康
徐欣
郑勇
CAO Wei-kang;XU Xin;ZHENG Yong(Suzhou Power Supply Company of State Grid Jiangsu Electric Power Co.,Ltd,Suzhou 215004,China)
出处
《电工电气》
2024年第10期61-66,共6页
Electrotechnics Electric
关键词
聚丙烯
纳米MgO
绝缘特性
介电常数
交流击穿场强
宽频介电谱
介电温谱
polypropylene
nano-MgO
insulation characteristic
dielectric constant
AC breakdown field strength
broadband dielectric spectroscopy
dielectric temperature spectrum
