Title :
Effects of charge trapping in gamma irradiated and accelerated aged low-density polyethylene
Author :
Kostoski, D. ; Suljovrujic, E. ; Dijcilovic, J. ; Novakovic, L.
Author_Institution :
Vinca Inst. of Nucl. Sci., Belgrade, Yugoslavia
Abstract :
The effects of gamma irradiation in air and accelerated aging were studied through dielectric loss (tan δ) analysis in the temperature range from 25 to 325 K and using thermally stimulated discharge current measurements (TSDC). The radiation induced oxidation was observed using IR spectroscopy. The influence of radiation dose and accelerated aging on the intensities and the positions of the γ and β dielectric relaxation maxima were correlated with maxima of TSDC measurements, and found to be strongly dependent upon the changes in the microstructure of the amorphous phase and on the surface of the crystallites induced by oxidation and crosslinking.
Keywords :
ageing; amorphous state; crystal microstructure; crystallites; dielectric losses; dielectric materials; dielectric relaxation; electron traps; gamma-ray effects; infrared spectra; oxidation; polymers; thermally stimulated currents; β dielectric relaxation maxima; γ dielectric relaxation maxima; 25 to 325 K; IR spectroscopy; TSDC measurements; accelerated aged low-density polyethylene; amorphous phase; charge trapping effects; crosslinking; crystallite surface; dielectric loss analysis; gamma irradiated low-density polyethylene; microstructure; radiation dose influence; radiation induced oxidation; thermally stimulated discharge current measurements; Accelerated aging; Current measurement; Dielectric loss measurement; Dielectric losses; Dielectric measurements; Infrared spectra; Oxidation; Polyethylene; Spectroscopy; Temperature distribution;
Conference_Titel :
Solid Dielectrics, 2004. ICSD 2004. Proceedings of the 2004 IEEE International Conference on
Print_ISBN :
0-7803-8348-6
DOI :
10.1109/ICSD.2004.1350370
