Title :
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
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;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1988. Annual Report., Conference on
Conference_Location :
Ottawa, Ont.
DOI :
10.1109/CEIDP.1988.26323
