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Titolo:
EFFECT OF PHYSICAL AGING ON DIELECTRIC, THERMAL AND MECHANICAL-PROPERTIES OF CAST-EPOXY INSULATORS
Autore:
LI Y; UNSWORTH J;
Indirizzi:
UNIV TECHNOL SYDNEY,CTR MAT TECHNOL SYDNEY AUSTRALIA
Titolo Testata:
IEEE transactions on dielectrics and electrical insulation
fascicolo: 1, volume: 1, anno: 1994,
pagine: 9 - 17
SICI:
1070-9878(1994)1:1<9:EOPAOD>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESIN SYSTEMS; COMPOSITES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
Y. Li e J. Unsworth, "EFFECT OF PHYSICAL AGING ON DIELECTRIC, THERMAL AND MECHANICAL-PROPERTIES OF CAST-EPOXY INSULATORS", IEEE transactions on dielectrics and electrical insulation, 1(1), 1994, pp. 9-17

Abstract

Samples of cast bisphenol-A and cycloaliphatic epoxy insulation were quenched from a temperature above T(g) (170-degrees-C) to room temperature. Variations in dielectric, thermal and mechanical properties wereexamined during subsequent sub-T(g) annealing (physical aging). It was found that the impact strength of the epoxy insulation decreased considerably with physical aging. Moisture intake and subsequent dielectric loss at room temperature were also found to decrease with physical aging. Glass transition temperature and excess enthalpy measured by DSC demonstrated significant increase with increased sub-T(g) annealing. On the other hand, dielectric properties showed different changing patterns during sub-T(g) annealing in different epoxy systems. It is concluded that epoxy insulating materials should be properly annealed before assessing their dielectric and other physical properties because of the possibility of unknown rapid cooling histories.

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Documento generato il 13/07/20 alle ore 11:15:43