Effects of crystallinity on dielectric properties of poly (1-lactide)

Saki Hikosaka, Hiroto Ishikawa, Yoshimichi Ohki

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

Poly (L-lactide) (PLLA) is attracting much attention as a biodegradable polymer. In this paper, effects of crystallinity on dielectric properties of PLLA are studied. At 80 °C, which is above the glass transition temperature (about 60 °C), the conductivity increases with a decrease in crystallinity. A thermally stimulated polarization current (TSPC) peak, which seems to be due to segmental-mode relaxation, appears in all the samples at temperatures around 65 to 70°C, and it becomes smaller as the crystallinity increases. All the samples show two thermally stimulated depolarization current (TSDC) peaks at around 65 °C and around 90 to 100°C. The lower-temperature peak seems to be due to the segmental-mode relaxation, while the other due to the normal-mode relaxation. Moreover, all the samples show a drastic increase in the real part of complex permittivity (ε r') and a peak in its imaginary part (ε r,") at frequencies from 10 -1 to 10 4 Hz, depending on the measurement temperature. The crystallinity dependencies of the two parts are similar to those of the TSPC and TSDC peaks around 65 to 70 °C. Therefore, the increase in ε r and the peak in ε r are ascribable to the segmental-mode relaxation.

Original languageEnglish
Pages (from-to)217-222+8
JournalIEEJ Transactions on Fundamentals and Materials
Volume129
Issue number4
DOIs
Publication statusPublished - 2009 Jul 20

Keywords

  • Biodegradable polymer
  • Complex permittivity
  • Crystallinity
  • Electrical conduction
  • Glass transition
  • Thermally stimulated current

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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