Partial discharge degradation of several biodegradable polymers

Norikazu Fuse*, Shinjiro Fujita, Naoshi Hirai, Toshikatsu Tanaka, Masahiro Kozako, Masanori Kohtoh, Shigemitsu Okabe, Yoshimichi Ohki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)


Partial discharge (PD) resistance was examined by applying a constant voltage to four different biodegradable polymers-poly-L-lactic acid (PLLA), polyethylene terephthalate succinate (PETS), poly ε-caprolactone butylene succinate (PCL-BS), and polybutylene succinate (PBS)-and the results were compared with those of low-density polyethylene (LDPE) and crosslinked low-density polyethylene (XLPE). The PD resistance is determined by the erosion depth and the surface roughness caused by PDs, and is ranked as LDPE ≈?XLPE > PLLA ≈?PETS > PBS > PCL-BS. This means that the sample with a lower permittivity has better PD resistance. Furthermore, examination of the sample surfaces by a polarization microscope and a laser confocal microscope reveals that the PD resistance of crystalline regions with spherulites is higher than that of amorphous regions. Therefore, good PD resistance can be achieved by the sample with a high crystallinity and a low permittivity.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalElectrical Engineering in Japan (English translation of Denki Gakkai Ronbunshi)
Issue number2
Publication statusPublished - 2009 Jul 30


  • Biodegradable polymer
  • Dielectric aging
  • Electrical insulation
  • Partial discharge
  • Surface degradation

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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