Effect of crystallinity on electrical conduction characteristics of poly(L-lactic acid)

Shingo Omori*, Makoto Matsushita, Fukutaro Kato, Yoshimichi Ohki

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


The crystallinity of poly(L-lactic acid) was changed by thermal annealing and its effects on electrical conduction characteristics were studied. Low-crystallinity samples have a higher conductivity and a higher remaining charge quantity than high-crystallinity samples. The sample shows two thermally stimulated current (TSC) peaks at around Tg and about 20 °C higher than Tg when its crystallinity is low, while it shows only the former TSC peak when its crystallinity is high. The TSC peak at around T g is attributable to the micro-Brownian motion that enables the orientation of dipoles in a direction perpendicular to the polymer main chain, whereas the high-temperature peak is attributable to the orientation and magnitude change of the end-to-end vector in the polymer main chain.

Original languageEnglish
Pages (from-to)3501-3503
Number of pages3
JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
Issue number6 A
Publication statusPublished - 2007 Jun 6


  • Biodegradable polymer
  • Crystallinity
  • Electrical conduction
  • Glass transition

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)


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