中国电机工程学报2025，Vol.45Issue(10)：4055-4066,中插31,13.DOI:10.13334/j.0258-8013.pcsee.232669
直流电压下PDMS/SiO2纳米复合材料的电荷积聚和输运特性
Space Charge Accumulation and Transport in PDMS/SiO2 Nanocomposites Under DC Voltages
摘要
Abstract
Dielectric elastomers(DE)with compliant electrodes are widely employed in polymer energy transducers.Under high DC electric field,the space charge accumulation and transport process in DE materials will cause the local electric field distortion,which accelerates the insulation aging,damage and failure,further affecting the long-term reliable operation of energy transducer.In this paper,the macroscopic dielectric properties of polydimethylsiloxane(PDMS)and its nanocomposites are characterized by infrared spectroscopy,thermally stimulated depolarization current(TSDC),broadband dielectric spectroscopy,conduction current measurements and breakdown tests.Based on the pulse electroacoustic method(PEA),space charge characteristics of the materials are measured at 20 kV/mm.The results show that the introduction of an appropriate amount of nano silica can reduce the dielectric loss of PDMS at low frequency area,decrease the conductivity and increase the DC breakdown strength.Second,in nanocomposites with higher doping concentration(＞2 phr),the surface-treated particles have better dispersion in PDMS due to mutual repulsion of hydrophobic groups,which still improves breakdown and conductivity performances slowly.In addition,the TSDC and multi-layer barrier structure space charge measurement results show that adding nano silica also leads to an increase in both trap charge amount and trap density,and a reduction of the ionization rate and negative carrier mobility,providing an explanation for the suppression of space charge accumulation in the composites under DC high voltage.The study of improving the insulation properties of PDMS under a high DC voltage by adding nanofillers can be used to improve the comprehensive properties of DE materials in transducers.关键词
聚二甲基硅氧烷/二氧化硅/空间电荷/陷阱/迁移率/电离Key words
polydimethylsiloxane(PDMS)/SiO2/space charge/trap/mobility/ionization分类
信息技术与安全科学引用本文复制引用
张琛,吕泽鹏,徐子航,曹丹,张馨月,吴锴..直流电压下PDMS/SiO2纳米复合材料的电荷积聚和输运特性[J].中国电机工程学报,2025,45(10):4055-4066,中插31,13.基金项目
国家自然科学基金项目(52007142) （52007142）
电气绝缘与电力设备国家重点实验室项目(EIPE23302).Project supported by National Natural Science Foundation of China(52007142) （EIPE23302）
State Key Laboratory of Electrical Insulation and Power Equipment(EIPE23302). （EIPE23302）
