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Vol. 32, No. 8(2), S&M2292

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Sensors and Materials, Volume 29, Number 8 (2017)
Copyright(C) MYU K.K.
pp. 1123-1133
S&M1405 Research Paper of Special Issue
https://doi.org/10.18494/SAM.2017.1542
Published: August 16, 2017

Transient Behavior of Space Charge in Heat-treated Low-density Polyethylene under Coupled fields [PDF]

Ling Zhang, Yuanxiang Zhou, Chenyuan Teng, Yunxiao Zhang, and Zixia Cheng

(Received December 6, 2016; Accepted June 16, 2017)

Keywords: low-density polyethylene, space charge, coupled field, negative differential mobility (NDM), trap level distribution

Developing high-performance polyethylene-based insulating materials for high-voltage direct current (HVDC) application is still a great challenge owing to space charge effects especially under DC conditions. In particular, microscopic crystal-amorphous structures make the charge transport process more complex under coupled fields, i.e., electric, temperature, and mechanical fields. Here, we investigate the effect of heat treatment on the morphology and space charge behavior of low-density polyethylene (LDPE) under temperature fields ranging from 20 to 60 ℃ under a high external DC field of −100 kV/mm. The results show that better crystallization in LDPE was achieved with a lower annealing rate, and both the size and level of uniformity of spherulites increased. Positive and negative charge packets were observed and followed the field-dependent negative differential mobility (NDM) law, which were strongly affected by temperature. According to the change in trap property, the effect of crystal-amorphous regions is critical to long-range hole transport, because larger spherulites showed increased difficulty on interchain tunneling, reduced carrier mobility, and reinforced hole trapping.

Corresponding author: Yuanxiang Zhou


Cite this article
Ling Zhang, Yuanxiang Zhou, Chenyuan Teng, Yunxiao Zhang, and Zixia Cheng, Transient Behavior of Space Charge in Heat-treated Low-density Polyethylene under Coupled fields, Sens. Mater., Vol. 29, No. 8, 2017, p. 1123-1133.



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