Jpn. J. Appl. Phys. 46 (2007) pp. 5908-5910 |Previous Article| |Next Article| |Table of Contents|
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Effect of Electrical Stressing History on Slow Polarization Behavior in Composite of Low-Density Polyethylene and Nano-SiOx
Department of Electrical Engineering, School of Electronics and Electrical Engineering, Shanghai Jiao Tong University, Dongchuan Road 800, Minhang, Shanghai 200240, China
(Received March 29, 2007; accepted May 22, 2007; published online September 7, 2007)
Nano-SiOx was homogeneously dispersed in low-density polyethylene (LDPE) and its dispersion status was investigated by scanning electron microscopy (SEM). Samples of LDPE and a composite containing 3 wt % nano-SiOx were polarized at a dc stress of 2×106 V/m and then depolarized three times. The depolarization currents of both samples were converted to the frequency domain to analyze dielectric loss (ε''). LDPE shows a typical slow polarization spectrum shifting upwards with electrical stressing time in the range of 1×10-3–1×10-1 Hz. The ε'' of the composite showed no peak in the range and it was considerably smaller than that of LDPE. Moreover, the ε'' of the composite did not vary significantly with electrical stressing time.
KEYWORDS:slow polarization, dielectric loss, low-density polyethylene, nano-SiOx, composite, electrical stressing history
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