An electrical prestressing in a composite of low-density polyethylene (LDPE)/nano-SiO x was observed when measuring high-electric-field conduction in the composite. This means that the DC conduction of a composite after being electrically prestressed with a high DC electrical field (about 8×10 7 V/m) for 2 h was lower than that of a non-prestressed composite. It is interesting that the electrical prestressing becomes more distinct with increasing nano-SiO x content. The interfaces between nano-SiO x particles and LDPE molecules were investigated by transmission electron microscopy (TEM), so did the dispersal status of nano-SiO x in LDPE. The effects of nano-SiO x on the crystallinity and crystal morphology of LDPE were verified by X-ray diffraction (XRD) analysis. In addition, the interaction between nano-SiO x particles and LDPE molecules was studied by Fourier transform infrared (FTIR) spectroscopy. Finally, the relationship between the electrical prestressing of high-electric-field conduction and the microscopic structure of a LDPE/nano-SiO x composite was discussed.
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Chen et al. (2005) studied this question.
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