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为研究纳米颗粒表面处理和填充浓度对聚丙烯(polypropylene,PP)介质内部空间电荷特性的影响,以PP为基料,分别以经过表面处理和未经表面处理的纳米氧化镁(Mg O)为填充颗粒,制备了2组不同质量分数的纳米Mg O/PP复合介质,并对纳米复合介质微观特性结构和空间电荷进行了实验研究。微观特性研究表明:无机纳米颗粒在聚合物中分散均匀,经过表面处理的复合介质团聚更少,Mg O的添加使介质结晶峰值温度和结晶度增加。空间电荷实验表明:在去极化过程中,添加经过表面处理和未经过表面处理的Mg O后,复合介质阴极的同极性电荷量减少,阳极异极性电荷基本消失,整体电荷密度下降;当Mg O质量分数为0.5%时,50 kV/mm电场强度下未经表面处理的体电荷密度为纯PP的37.2%,经过表面处理的体电荷密度为纯PP的52.8%,抑制效果均为实验试样中最佳;高电场下,未经过表面处理的复合介质对于空间电荷抑制作用相比经过表面处理的复合介质更明显,经过表面处理的复合介质对于极化过程中空间电荷造成的电场畸变有更好的抑制效果。
In order to study the effects of surface treatment and concentration of nanoparticles on the internal charge characteristics of polypropylene (PP) media, PP as base material, respectively, with or without surface treatment of nano-MgO Two groups of nano-Mg O / PP composite media with different mass fractions were prepared by filling particles. The microscopic structure and space charge of nano-composite media were also studied. The results show that inorganic nanoparticles are uniformly dispersed in the polymer, the surface treatment of the composite medium agglomeration less, MgO added to the medium crystallization peak temperature and crystallinity increased. The results of space charge experiments show that with the addition of surface treated and untreated MgO, the charge of the same polarity in the composite cathode decreases, the anodic charge of the anode disappears, and the overall charge density decreases. When the mass fraction of MgO is 0.5%, the bulk charge density without surface treatment is 37.2% of the pure PP at 50 kV / mm electric field strength, and the surface charge density is 52.8% of the pure PP, the inhibition effect is In the high electric field, the composite medium without surface treatment has more obvious inhibition effect on the space charge than the surface treated composite medium, and the surface treatment composite medium is more sensitive to the electric field caused by the space charge in the polarization process Distortion has a better inhibitory effect.