Charge storage and transport in oriented and non-oriented polytetrafluoroethylene films

Author

Gongxun Cao ; Xiaoqing Zhang ; Da Zhao ; Zhang, Chenghui ; Ben Wang ; Changchun Zeng

Author_Institution

Dept. of Phys., Tongji Univ., Shanghai, China

Volume

19

Issue

4

fYear

2012

fDate

8/1/2012 12:00:00 AM

Firstpage

1108

Lastpage

1115

Abstract

The charge storage and transport in oriented and non-oriented polytetrafluoroethylene (PTFE) films, charged by the corona method at room temperature, were investigated by isothermal decay and thermally stimulated discharge (TSD) techniques. The crystallinity of the PTFE films was determined by differential scanning calorimetry (DSC). The results obtained from isothermal decay of the surface potential and the spectra of the TSD charge and current indicate that the thermal stability of both positive and negative charges in oriented PTFE films is significantly better than that of non-oriented PTFE films. This is probably due to the higher crystallinity in oriented PTFE films. The transport of the de-trapped positive charges in oriented PTFE films, which occurred due to thermal excitation, can be explained by a model that takes thermal ion emission into consideration.

Keywords

corona; differential scanning calorimetry; polymer films; surface potential; thermal stability; thermally stimulated currents; thermionic ion emission; DSC; PTFE films crystallinity; TSD charge; TSD techniques; charge storage; charge transport; corona method; differential scanning calorimetry; isothermal decay; negative charges; nonoriented PTFE films; nonoriented polytetrafluoroethylene films; positive charge detrapping; surface potential; thermal excitation; thermal ion emission; thermal stability; thermally stimulated discharge techniques; Corona; Electrodes; Films; Heating; Stability analysis; Temperature measurement; Thermal stability; Electret; non-oriented; oriented; polytetrafluoroethylene;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/TDEI.2012.6259977

Filename

6259977