The dielectric behaviour of polymers irradiated at 5 K

Author

Banford, H.M. ; Tedford, D.J. ; Ayoubi, M.

Author_Institution

Scottish Univ. Res. & Reactor Centre, Glasgow, UK

fYear

1988

fDate

16-20 Oct 1988

Firstpage

147

Lastpage

152

Abstract

A measurement system was developed to carry out frequency domain dielectric spectroscopy and TSDC (thermally stimulated discharge currents) automatically on multiple samples which can be irradiated in helium over a wide temperature range from 5 to 300 K. The system was used to study the dielectric behavior of polyimide and low-density polyethylene (LDPE) as a function of temperature and gamma radiation. Measurements of loss in polyimide and LDPE gamma-irradiated at 5 K to doses of 10⁵ Gy show no effects of radiation. A TSDC signal was observed for polyimide irradiated to 10⁵ Gy. The small currents evident at low temperatures are probably due to geminate carriers, and there is a β peak around 170 K

Keywords

dielectric losses; gamma-ray effects; polymers; thermally stimulated currents; 1×10³ Gy; 170 K; 5 to 300 K; He; dielectric behaviour; frequency domain dielectric spectroscopy; gamma radiation; geminate carriers; loss; low-density polyethylene; multiple samples; polyimide; polymers; temperature dependence; thermally stimulated discharge currents; Current measurement; Dielectric loss measurement; Dielectric measurements; Electrochemical impedance spectroscopy; Frequency domain analysis; Frequency measurement; Helium; Polyimides; Polymers; Temperature distribution;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1988. Annual Report., Conference on

Conference_Location

Ottawa, Ont.

Type

conf

DOI

10.1109/CEIDP.1988.26323

Filename

26323