Effect of gamma-ray irradiation on the TSC in polyethersulfone

Author

Kim, E.J. ; Kato, G. ; Ohara, T. ; Ohki, Y. ; Li, S.T.

Author_Institution

Dept. of Electr. Electron. & Comput. Eng., Waseda Univ., Tokyo, Japan

Volume

4

Issue

6

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

732

Lastpage

737

Abstract

When polyethersulfone was irradiated by γ rays and then poled at 37°C, a new TSC (thermally stimulated current) peak appeared at ~100°C. This new peak and other peaks near 40 and 150°C increase with an increase in dose of ~0.6 kGy, and this is considered to be due to trapped charges and other ionic carriers becoming mobile when rearrangement of scissioned chains occurs. However, if the dose exceeds 0.6 kGy, the peak magnitude decreases. Furthermore, if the TSC was poled at 120°C, only the peak near 150°C appeared and this peak monotonically decreased with an increase in the irradiation dose. A similar decreasing tendency was also observed in the conduction current and in the residual voltage. These decreasing features are considered to be caused by the radiation-induced change that rearrangement of scissioned chains decreases free volume for ionic transport

Keywords

gamma-ray effects; organic insulating materials; polymers; thermally stimulated currents; 120 C; 37 C; TSC; conduction current; free volume; gamma-ray irradiation; ionic transport; poling; polyethersulfone; residual voltage; scissioned chains; thermally stimulated current; trapped charges; Dielectrics and electrical insulation; Electrodes; Heating; Mechanical factors; Plastic insulation; Polymers; Pulse measurements; Space charge; Temperature distribution; Voltage;

fLanguage

English

Journal_Title

Dielectrics and Electrical Insulation, IEEE Transactions on

Publisher

ieee

ISSN

1070-9878

Type

jour

DOI

10.1109/94.654688

Filename

654688