期刊
IEEE TRANSACTIONS ON DIELECTRICS AND ELECTRICAL INSULATION
卷 21, 期 4, 页码 1516-1528出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TDEI.2014.004314
关键词
Nanocomposites; epoxy resin; POSS; dielectric constant; nanostructure; electrical conductivity; activation energy; space charge distribution; breakdown strength
资金
- National Science Foundation of China [51107081, 51217117]
- Research Fund for the Doctoral Program of Higher Education [20100073120038, 20120073110031]
- State Key Lab of Power System [SKLD13KZ02]
- Shanghai Leading Academic Discipline Project [B202]
- Special Fund of the National Priority Basic Research of China [2014CB239503]
The knowledge of the structure-property relationship at nanoscale level is important to develop advanced dielectric polymer composites. Herein dielectric epoxy/polyhedral oligomeirc silsesquioxanes (POSS) composites with homogeneous nanostructure were prepared. Unlike the conventional inorganic nanoparticles (e.g., silica) used for polymer nanocomposite preparation, the POSS molecules used in this work have three advantages: a comparable size with the segments of polymer chains, being capable of reacting with the base polymer, good solubility in many solvents. These three advantages make the POSS be dispersed in polymers at a molecular level and thus their nano-effect could be fully utilized. Microstructure analysis by transmission electron microscopy, atomic force microscopy and X-ray diffraction confirmed the molecular-level dispersion of POSS in the epoxy composites. On this base, the partial discharge erosion resistance, frequency/temperature dependence of dielectric response, space charge distribution and breakdown strength of the epoxy/POSS composites were investigated. Moreover, the correlation between the nanostructure and properties of epoxy/POSS composites was documented.
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