Title :
Material morphology and energy barriers to electrical ageing
Author :
Cooper, E.S. ; Fothergill, J.C. ; Dissado, L.A. ; Hampton, R.N.
Author_Institution :
Dept. of Eng., Leicester Univ., UK
fDate :
6/23/1905 12:00:00 AM
Abstract :
A distribution of the parameters representing activation energy of the ageing process within the Dissado-Montanari-Mazzanti (DMM) lifetime model has been shown to model experimental lifetime distributions of PET films well. The results imply small differences in the local environments of the moieties involved in the ageing process. Very small changes in the minimum activation energy values have a pronounced effect on the resultant lifetimes of polymer specimens. Changes in the distributions of activation energies with field and temperature can be explained by assuming the ageing process to be one whereby polymer segments on lamella surfaces crystallise to create free volume within the polymer
Keywords :
Weibull distribution; ageing; polyethylene insulation; polymer films; DMM lifetime mode; PET films; activation energy; electrical ageing; energy barriers; lamella surfaces; material morphology; polymer specimens; Aging; Dielectrics and electrical insulation; Entropy; Equations; Morphology; Plastic insulation; Polymers; Predictive models; Stress; Testing;
Conference_Titel :
Solid Dielectrics, 2001. ICSD '01. Proceedings of the 2001 IEEE 7th International Conference on
Conference_Location :
Eindhoven
Print_ISBN :
0-7803-6352-3
DOI :
10.1109/ICSD.2001.955615
