Abstract
Transient charging currents resulting from the application of a low constant voltage, up to 2×104 V cm−1, are investigated in melt crystallized samples of high density polyethylene. Three distinct regions can be clearly distinguished in the current-field characteristic curves at a given time after application of a voltage: (a) a linear region at a low electric field, (b) a negative resistance region in which the slope is negative at a medium electric field, (c) a superlinear region at a high electric field. At low electric fields and for charging times less than 103 sec the law of dielectric response, l ∼ t −n, is obeyed. It is shown that the type of cooling process, after annealing at temperatures near 75° C, markedly influences the current decay. Annealing at this temperature is associated with a partial rearrangement of the lamellar microstructure. The current is enhanced after quenching while it decreases after slow cooling. Various mechanisms to explain the obtained data are considered.
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Aguilar, M., Jaque, F., Calleja, F.J.B. et al. Transient charging currents in annealed bulk polyethylene. J Mater Sci 16, 2079–2083 (1981). https://doi.org/10.1007/BF00542367
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DOI: https://doi.org/10.1007/BF00542367