Effect of glass transition on conduction current in biodegradable poly-L-lactic acid

Y. Maeno, Y. Yamaguchi, N. Hirai, T. Tanaka, Y. Ohki, Y. Tajitsu, M. Kohtoh, S. Okabe

Research output: Contribution to journalConference article

8 Citations (Scopus)


The temperature dependence of electrical conduction current in additive-free poly-L-lactic acid was measured. Although the current obeys the Arrhenius formula, a hump appears under some conditions, depending on whether the temperature is being ascended or descended, and also on whether the sample was poled or short-circuited prior to the measurements. That polar groups consisting mainly of carbonyl groups in the sample changed their directions was confirmed by Fourier-transform infrared spectroscopy. The permittivity increases around 74°C. From these results, it is confirmed that orientational polarization or depolarization occurs around 74°C by the glass transition, and that its resultant current and the conduction current overlap with each other.

Original languageEnglish
Pages (from-to)49-52
Number of pages4
JournalAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
Publication statusPublished - 2004 Dec 1
Event2004 Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP - Boulder, CO, United States
Duration: 2004 Oct 172004 Oct 20


ASJC Scopus subject areas

  • Engineering(all)

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