NDLI: Packet-like space charge dynamics in polyethylene with various crystallinity

Content Provider	IEEE Xplore Digital Library
Author	Feihu Zheng Hui Zhao Junfeng Xia Yewen Zhang
Copyright Year	2010
Description	Author affiliation: Shanghai Key Laboratory of Special Artificial Microstructure Materials and Technology, Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China (Feihu Zheng; Hui Zhao; Junfeng Xia; Yewen Zhang)
Abstract	As the phenomenon of packet-like space charge behavior in polyethylene was firstly indentified near thirty years ago, much effort has been done to clarify its physical mechanism. The packet-like space charge density and migrating velocity are of the two main parameters to characterize this phenomenon. Both the parameters could be serious influenced by the micro-structure of the material, since the micro-structure could significantly influence charge trap density and trap level, which therefore influence the space charge migration. In this study, linear low density polyethylene (LLDPE) samples with various crystalline rate and gradient crystalline were prepared by hot pressing process with controlled cooling rate. The evolution of space charge packet in the various LLDPE samples sandwiched by semiconducting electrodes was monitored by pressure wave propagation (PWP) method under DC 40MV/m stress at 40°C. The influence of crystallinity and micro-morphology on charge injecting rate, mobility and decaying procedure in LLDPE are discussed. The results show that the heating treating procedure could significantly influence the dynamics of packet-like space charge and the charge decay process. The slow cooling rate could lead to deeper trap level and therefore slower packet charge.
Starting Page	1
Ending Page	4
File Size	322637
Page Count	4
File Format	PDF
ISBN	9781424479450
e-ISBN	9781424479443
e-ISBN	9781424479436
DOI	10.1109/ICSD.2010.5568004
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-04
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Cooling Space charge Polyethylene Morphology Dielectrics Electrodes crystallinity polyethylene space charge dynamics
Content Type	Text
Resource Type	Article

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