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Comparison of space charge behavior between polypropylene and polyethylene

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5 Author(s)
E. Nakane ; Dept. of Electr. Eng. & Comput. Sci., Nagoya Univ., Japan ; K. Kaneko ; T. Mitzutani ; H. Takino
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In this paper we investigated space charge and electrical conduction in polypropylene (PP), H-PP and M-PP which are homopolymer and copolymer with 3∼3.5 % ethylene, respectively. Both space charge distribution and charging current were affected by the copolymerization of ethylene which enhanced electrical conduction. The amount of space charge in Al/PP/SC was the largest around 40 °C. The charge carriers injected from the semiconducting (SC) electrode became dominant with increasing temperature. Their results were compared with those of low-density polyethylene (LDPE). LDPE showed much higher current than PP. The difference in space charge distribution among H-PP, M-PP and LDPE was explained in terms of mobilities of charge carriers. The field dependence of charging currents was explained by Schottky injection.

Published in:

Proceedings of 2005 International Symposium on Electrical Insulating Materials, 2005. (ISEIM 2005).  (Volume:3 )

Date of Conference:

5-9 June 2005