High-Field Dielectric Dissipation Property in Low-Density Polyethylene Film

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Abstract
The high-field dielectric dissipation factor (tan δ) of low-density polyethylene (LDPE) films was studied as a function of the applied ac field and the voltage application period. The measurements were made at room temperature by means of a current comparator-type capacitance bridge. As the applied ac field increased, the high-field tan δ increased gradually. With the voltage application period, the high-field tan δ first increased and then decreased, exhibiting a peak. This time variation of tan δ was accelerated with increase in the applied electric field. These characteristics of the high-field tan δ in LDPE films are discussed on the bases of the carrier generation in the bulk due to the modified Poole-Frenkel effect, the carrier injection from the electrodes, the trapping of the carriers and the formation of the space charge layer in front of the electrodes.

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