The Effect of Humidity on Dielectric Properties of PP-Based Nano-Dielectric

被引:5
作者
Chi, Xiaohong [1 ]
Liu, Wenfeng [1 ]
Li, Shengtao [1 ]
Zhang, Xiaohong [2 ]
机构
[1] Xi An Jiao Tong Univ, State Key Lab Elect Insulat & Power Equipment, Xian 710049, Shaanxi, Peoples R China
[2] Harbin Univ Sci & Technol, Key Lab Engn Dielect & Its Applicat, Minist Educ, Harbin 150080, Heilongjiang, Peoples R China
来源
MATERIALS | 2019年 / 12卷 / 09期
关键词
PP-based nano-dielectric; dielectric properties; damp degradation; water molecules distribution; WATER-ABSORPTION; CHARGE; NANOCOMPOSITES; BREAKDOWN; POLYETHYLENE; INTERFACES; EPOXY;
D O I
10.3390/ma12091378
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Nano-dielectrics are sensitive to humidity and easily degraded in damp environment because of the high surface energy of nanoparticles. In order to study the effect of humidity on the dielectric properties of nano-dielectric, polypropylene (PP) was modified by polyolefin elastomer (POE) and nano-SiO2, and the samples with obvious filling concentration were pre-selected by breakdown strength for damp aging. The aging experiments were carried out in different relative humidity. The dielectric properties of new, hygroscopic saturation and samples after drying were measured and analyzed. It is found that the breakdown strength of hygroscopic saturation nano-dielectrics decreased obviously compared with new samples, and it was difficult to recover after drying. The damp degradation resulted in different changing trends of permittivity of PP and nano-dielectric, but there were relaxation loss peaks of water in both of them. The influence of damp degradation on the trap distribution was studied by thermally stimulated depolarization currents (TSDC), and it was found that the traps level introduced by water molecules was different in PP and nano-dielectrics. All experiment results showed that the performance of nano-dielectrics degraded obviously in humid environment, and it was difficult to recover even after complete drying because of the existence of bounded water molecules in nano-dielectrics.
引用
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页数:11
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