Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide)

S. Hikosaka*, H. Ishikawa, Y. Ohki

*この研究の対応する著者

研究成果: Conference contribution

11 被引用数 (Scopus)

抄録

Recently poly(L-lactide) synthesized from starch is attracting much attention as a biodegradable polymer. In this paper, effects of crystallinity on dielectric properties of PLLA were studied by preparing four kinds of PLLA samples with different crystallinities. A thermally stimulated polarization current (TSPC) peak was found to appear in all the samples at temperatures around 65 to 70 °C, which is due to the glass transition. The magnitude of the TSPC peak was found to be in the reverse order of crystallinity. This is presumably because the segmental-mo de relaxation, which brings about the TSPC, is restricted more 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 and have a peak in its imaginary part at frequencies from 10 -1 to 104 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 the real part and the peak in the imaginary part are ascribable to the segmental-mode relaxation.

本文言語English
ホスト出版物のタイトル2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
ページ497-500
ページ数4
DOI
出版ステータスPublished - 2008 12月 1
イベント2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008 - Quebec City, QC, Canada
継続期間: 2008 10月 262008 10月 29

出版物シリーズ

名前Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
ISSN(印刷版)0084-9162

Conference

Conference2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
国/地域Canada
CityQuebec City, QC
Period08/10/2608/10/29

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 電子工学および電気工学

フィンガープリント

「Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide)」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル