Effect of thermal aging on breakdown strength of polyethylene

Effect of thermal aging on breakdown strength of low-density polyethylene has been investigated with fixed electrodes. Thermal aging of polyethylene induces oxidation and rearrangement of molecular chains which cause an increase of its crystallinity and a decrease in the long period. In the initial...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1985-01, Vol.24 (4), p.441-445
Main Authors: KATAKAI, S, YAHAGI, K
Format: Article
Language:English
Subjects:
Applied sciences
Electrical, magnetic and optical properties
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
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Summary:Effect of thermal aging on breakdown strength of low-density polyethylene has been investigated with fixed electrodes. Thermal aging of polyethylene induces oxidation and rearrangement of molecular chains which cause an increase of its crystallinity and a decrease in the long period. In the initial stages of thermal aging, the amorphous parts grow strained with an increase in the crystallinity, and oxidation products introduced in the crystalline surface regions may act as deep traps for electronic carriers which in turn cause an increase in the breakdown strength at room temperature. In the advanced stages of thermal aging and in the high temperature range where crystalline melts, carbonyl groups in amorphous parts due to oxidation may become active and act as hopping sites for accelerated electrons. Therefore, the electronic conductivity increases and the breakdown strength decreases.
ISSN:0021-4922
1347-4065
DOI:10.1143/jjap.24.441