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Journal of Nanomaterials
Volume 2015 (2015), Article ID 231672, 8 pages
Research Article

Surge-Resistant Nanocomposite Enameled Wire Using Silica Nanoparticles with Binary Chemical Compositions on the Surface

1Department of Nano Science & Technology, Sejong Polymer Research Center, Sejong University, Seoul 05006, Republic of Korea
2Center for Thermometry, Division of Physical Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, Republic of Korea

Received 12 August 2015; Revised 26 October 2015; Accepted 27 October 2015

Academic Editor: John Zhanhu Guo

Copyright © 2015 Jeseung Yoo et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We developed polyesterimide (PEI) nanocomposite enameled wires using surface-modified silica nanoparticles with binary chemical compositions on the surface. The modification was done using silanes assisted by ultrasound, which facilitated high density modification. Two different trimethoxysilanes were chosen for the modification on the basis of resemblance of chemical compositions on the silica surface to PEI varnish. The surface-modified silica was well dispersed in PEI varnish, which was confirmed by optical observation and viscosity measurement. The glass transition temperature of the silica-PEI nanocomposite increased with the silica content. The silica-dispersed PEI varnish was then used for enameled wire fabrication. The silica-PEI nanocomposite enameled wire exhibited a much longer lifetime compared to that of neat PEI enameled wire in partial discharge conditions.