Title :
Monitoring of degradation processes in poly-(ethyleneglycolterephthalate) by dielectric relaxation spectroscopy
Author_Institution :
Dept. of Phys., Tech. Univ. of Brno, Czech Republic
Abstract :
Dielectric spectra of poly-(ethyleneglycolterephthalate) (PETP) in different stages of ageing and at different temperatures are examined and analyzed. Two relaxation processes, α and β, are observed, the intensity of the β-process being about two orders of magnitude lower than that of the α-process. More significant changes of the relaxation spectrum (shift of the α-relaxation) occur only for ageing times in excess of 1500 hours. The molecular origin of the relaxation is discussed
Keywords :
ageing; dielectric relaxation; polyethylene insulation; polymer structure; α-relaxation; β-relaxation; 1E-3 Hz to 100 kHz; 25 to 100 C; 500 to 2000 hour; PETP; ageing; degradation process monitoring; dielectric relaxation spectroscopy; dielectric spectra; insulating foils; molecular origin; poly-(ethyleneglycolterephthalate); Aging; Computerized monitoring; Degradation; Dielectric measurements; Dielectrics and electrical insulation; Electrochemical impedance spectroscopy; Electrodes; Frequency; Physics; Temperature;
Conference_Titel :
Electrical Insulation and Dielectric Phenomena, 1996., IEEE 1996 Annual Report of the Conference on
Conference_Location :
Millbrae, CA
Print_ISBN :
0-7803-3580-5
DOI :
10.1109/CEIDP.1996.564606
