TSD-study of polyethylene photochemical degradation

• Published in: Proceedings of the 2004 IEEE International Conference on Solid Dielectrics, 2004. ICSD 2004 Vol. 1; pp. 347 - 350 Vol.1
• Main Authors: Goldade, V.A., Pinchuck, L.S., Kravstov, A.G., Zotov, S.V.
• Format: Conference Proceeding
• Language: English
• Published: Piscataway NJ IEEE 2004
• Subjects: Aging; Applied sciences; Charge carriers; Chemicals; Current measurement; Degradation; Dielectrics; Electrical engineering. Electrical power engineering; Electrical power engineering; Electromagnetic wave absorption; Exact sciences and technology; Operation. Load control. Reliability; Optical polymers; Photochemistry; Polyethylene; Power networks and lines; Thermostimulated depolarization; Degradation; Relaxation; Microcrack; Charge carrier; Ageing; Power system economics; Photoinduced effect; Polymer; Power markets; Maximum temperature; Open market
• ISBN: 0780383486; 9780780383487
• DOI: 10.1109/ICSD.2004.1350362

Thermally stimulated depolarization of PE films subjected to photochemical aging was carried out. Thermally stimulated current spectra were obtained and interpreted in terms of the classical dielectric model with discrete trapping levels. Maximums on the temperature plots of thermally stimulated currents were explained by detrapping of charge carriers through two types of competitive photoinduced processes: weakening of the intermolecular interaction responsible for relaxation processes and structuring, on the one hand, and displacement and concentration of dislocations, the appearance of microcracks, and the transformation of supermolecular entities by crosslinking of macromolecules, on the other hand. Thermally stimulated current spectra bear information on the technological history of the films. The technique of thermally stimulated depolarization is useful to obtain new information on the photochemical aging of polymers.