Space charge distribution in multi-ply LDPE

The authors present experimental results on space charge distribution at the metal-polymer interface and the polymer-polymer interface by a pulsed electroacoustic method. In order to determine how much influence impurity diffusion has on the original material, two kinds of molding LDPE (low-density polyethylene) samples were used in the experiment. One was a molding sample generated without polyethylene terephthalate film (PET), and the other was generated with PET film. Molding board materials are shown to have a strong effect on the space charge distribution. Heterocharge distribution is dominant in the sample with PET film processing, whereas homocharge distribution is dominant in the sample without PET film processing. For the hot pressing sample, the space charge distribution at the polymer-polymer interface looks like that at the metal-polymer interface. This may imply that the characteristic fluctuations of the space charge distribution are strongly dependent on the materials themselves and the preparation process