NDLI: Investigations on the aging of cross-linked ethylene vinyl silane copolymer

Content Provider	IEEE Xplore Digital Library
Author	Sarma, H. Mahabir, C. Shaikevitch, A.
Copyright Year	1996
Description	Author affiliation: AT Plastics Inc., Brampton, Ont., Canada (Sarma, H.)
Abstract	Cross-linked ethylene vinyl silane copolymer (EVS) used as an electrical insulation in low voltage secondary cables was examined for its oxidative aging behaviour. Thermal aging of the copolymer was found to consist of three stages. The first stage consisted of an increase in the silane cross-linking induced thermally, the second stage was defined by the consumption of antioxidants with a subsequent increase in oxidation leading to brittle failure as the third stage. The type and concentration of the antioxidants determined the extent of the second stage, influencing the target application of the copolymer. For a copolymer with selected antioxidant concentration, the brittle failure occurring in the third stage could be related to an increase in cross-link density of the copolymer. Aging of the copolymer under UV conditions, resulted first in oxidation, characterized by carbonyl species and polymer unsaturation, leading to brittle failure. There was little or no increase in cross-linking. Under either aging conditions the electrical breakdown strength of the copolymer was retained to above 50% until the samples became brittle. Practical implications of the results from these investigations are discussed.
Starting Page	624
Ending Page	631
File Size	795581
Page Count	8
File Format	PDF
ISBN	0780335317
ISSN	1089084X
DOI	10.1109/ELINSL.1996.549423
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1996-06-16
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aging Oxidation Dielectrics and electrical insulation Polymers Cable insulation Cables Electric breakdown Thermal degradation Electric variables measurement Dielectric loss measurement
Content Type	Text
Resource Type	Article

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