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Journal of Nanomaterials
Volume 2013, Article ID 712543, 7 pages
Research Article

Improved Electric Strength and Space Charge Characterization in LDPE Composites with Montmorillonite Fillers

1State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shaping Ba District, Chongqing 400044, China
2China Electric Power Research Institute, Beijing 100192, China

Received 16 September 2013; Accepted 24 October 2013

Academic Editor: Wenjie Mai

Copyright © 2013 Ruijin Liao 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.


Space charge distribution and breakdown strength were investigated in composites of low density polyethylene (LDPE) and various contents of montmorillonite (MMT). The disperse performance of MMT in LDPE was observed with scanning electron microscopy (SEM) and X-ray diffraction. For MMT concentration of 1 wt%, the better intercalation of LDPE into MMT interlayers and the tighter interface structure between polymer-filler were observed, relative to MMT concentration of 3 and 5 wt%. Space charge profiles were obtained using the pulsed electroacoustic (PEA) method. Less space charge accumulated in the LDPE/MMT with MMT content of 1 wt% than that in pure LDPE, and space charge in the central of LDPE/MMT was much more uniformly. On the other hand, when MMT concentration was up to 3 and 5 wt%, large amounts of heterocharges were accumulated in the sample bulk. In MMT doped samples the dielectric strength increased up to a maximum at 1 wt% loading, and then decreases at 3 and 5 wt%.