Comparison of the effects of heat and gamma irradiation on the degradation of cross-linked polyethylene

Ziyang Liu, Yu Miyazaki, Naoshi Hirai, Yoshimichi Ohki*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


For conducting comparative research, samples of cross-linked polyethylene (XLPE), made exactly in the same manner as those used in nuclear power plants, were aged in two ways: purely thermally, and concurrently with heat and γ-irradiation, for long periods up to 2000 h. They were then examined by an indenter, mid-infrared absorption spectroscopy, broadband dielectric spectroscopy, and measuring the electrical conductivity. As a result, it became clear that the effect of radiation is more dominant than that of heat on the oxidation or carbonyl formation in XLPE. However, heat is a more determining factor on the surface hardness of XLPE. In addition, the complex permittivity of XLPE increases as a result of the appearance of abundant carbonyl groups. Both the carbonyl index and indenter modulus can be indicators of aging.

Original languageEnglish
Pages (from-to)24-29
Number of pages6
JournalIEEJ Transactions on Electrical and Electronic Engineering
Issue number1
Publication statusPublished - 2020 Jan 1


  • XLPE
  • aging
  • degradation
  • irradiation
  • oxidation
  • radioactive

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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