Thermally stimulated depolarization current spectra of cross-linked polyethylene and the influence of cross-linking byproducts

Roger C. Walker, Hossein Hamedi, William Hunter Woodward, Michael Lanagan

Research output: Contribution to journalArticlepeer-review

Abstract

Cross-linked polyethylene (XLPE) is notable for its use as power cable insulation. Its longevity is limited by space charge buildup linked to impurities such as the byproducts left behind by the cross-linking agent dicumyl peroxide (DCP). The goal of this work is to determine the impacts of these byproducts on charge trapping and detrapping in XLPE using the thermally stimulated depolarization current technique. XLPE with byproducts has one source of trapped charge, which originates from the byproducts. XLPE that was thermally treated via degassing exhibits two other sources of trapped charge, which are charge injection and dipolar relaxations. Oxidation from degassing was shown to control the trapping from these sources, which is useful knowledge for processing this material prior to its use. Reintroducing acetophenone, one of the major byproducts of DCP, suppresses those two peaks once more, showing that it controls the overall space charge buildup characteristics in XLPE.

Original languageEnglish (US)
Pages (from-to)3142-3152
Number of pages11
JournalJournal of Polymer Science
Volume58
Issue number22
DOIs
StatePublished - Nov 15 2020

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Materials Chemistry
  • Polymers and Plastics

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