期刊
APPLIED PHYSICS LETTERS
卷 110, 期 13, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4979107
关键词
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资金
- State Key Development Program of Basic Research of China (973 Program) [2014CB239501]
- National Natural Science Foundation of China [50377089]
- China Postdoctoral Science Foundation [2016M591176]
- China Scholarship Council (CSC) [201306210134]
- Rensselaer Nanotechnology Center
Incorporating inorganic nanoparticles (NPs) into polymer matrices provides a promising solution for suppressing space charge effects that can lead to premature failure of electrical insulation used in high voltage direct current engineering. However, realizing homogeneous NP dispersion is a great challenge especially in high-molecular-weight polymers. Here, we address this issue in crosslinked polyethylene by grafting matrix-compatible polymer brushes onto spherical colloidal SiO2 NPs (10-15 nm diameter) to obtain a uniform NP dispersion, thus achieving enhanced space charge suppression, improved DC breakdown strength, and restricted internal field distortion (<= 10.6%) over a wide range of external DC fields from -30 kV/mm to -100 kV/mm at room temperature. The NP dispersion state is the key to ensuring an optimized distribution of deep trapping sites. A well-dispersed system provides sufficient charge trapping sites and shows better performance compared to ones with large aggregates. This surface ligand strategy is attractive for future nano-modification of many engineering insulating polymers. Published by AIP Publishing.
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