Effect of Glass Transition on Electrical Conduction Characteristics of Poly-L-lactic Acid

Yasumasa Maeno, Yuya Yamaguchi, Naoshi Hirai, Yoshimichi Ohki, Toshikatsu Tanaka, Yoshiro Tajitsu, Masanori Kohtoh, Shigemitsu Okabe

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The temperature dependence of electrical conduction current in additive-free poly-L-lactic acid was measured from 20°C to 90°C under application of dc 2.5 kV. Although the current obeys the Arrhenius formula, a hump appears in 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. Even under short-circuit condition, a similar hump alone appears if the sample was poled by a dc voltage beforehand. From these results, it is assumed 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. The fact that polar groups, mainly carbonyl groups, in the sample really changed their directions was confirmed by Fourier-transform infrared spectroscopy. The permittivity also increases around 74°C. These facts indicate that the number of dipoles, which become possible to rotate toward the direction of electric field, is increased by the glass transition.

Original languageEnglish
Pages (from-to)254-260
Number of pages7
JournalIEEJ Transactions on Fundamentals and Materials
Volume125
Issue number3
DOIs
Publication statusPublished - 2005

Fingerprint

Lactic acid
Glass transition
Depolarization
Short circuit currents
Fourier transform infrared spectroscopy
Permittivity
Electric fields
Polarization
Temperature
Electric potential

Keywords

  • biodegradable polymer
  • dielectric property
  • electrical conduction
  • glass transition
  • poly-L-lactic acid

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Effect of Glass Transition on Electrical Conduction Characteristics of Poly-L-lactic Acid. / Maeno, Yasumasa; Yamaguchi, Yuya; Hirai, Naoshi; Ohki, Yoshimichi; Tanaka, Toshikatsu; Tajitsu, Yoshiro; Kohtoh, Masanori; Okabe, Shigemitsu.

In: IEEJ Transactions on Fundamentals and Materials, Vol. 125, No. 3, 2005, p. 254-260.

Research output: Contribution to journalArticle

Maeno, Yasumasa ; Yamaguchi, Yuya ; Hirai, Naoshi ; Ohki, Yoshimichi ; Tanaka, Toshikatsu ; Tajitsu, Yoshiro ; Kohtoh, Masanori ; Okabe, Shigemitsu. / Effect of Glass Transition on Electrical Conduction Characteristics of Poly-L-lactic Acid. In: IEEJ Transactions on Fundamentals and Materials. 2005 ; Vol. 125, No. 3. pp. 254-260.
@article{662e3ac9922e458cbe6799dfb12770f9,
title = "Effect of Glass Transition on Electrical Conduction Characteristics of Poly-L-lactic Acid",
abstract = "The temperature dependence of electrical conduction current in additive-free poly-L-lactic acid was measured from 20°C to 90°C under application of dc 2.5 kV. Although the current obeys the Arrhenius formula, a hump appears in 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. Even under short-circuit condition, a similar hump alone appears if the sample was poled by a dc voltage beforehand. From these results, it is assumed 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. The fact that polar groups, mainly carbonyl groups, in the sample really changed their directions was confirmed by Fourier-transform infrared spectroscopy. The permittivity also increases around 74°C. These facts indicate that the number of dipoles, which become possible to rotate toward the direction of electric field, is increased by the glass transition.",
keywords = "biodegradable polymer, dielectric property, electrical conduction, glass transition, poly-L-lactic acid",
author = "Yasumasa Maeno and Yuya Yamaguchi and Naoshi Hirai and Yoshimichi Ohki and Toshikatsu Tanaka and Yoshiro Tajitsu and Masanori Kohtoh and Shigemitsu Okabe",
year = "2005",
doi = "10.1541/ieejfms.125.254",
language = "English",
volume = "125",
pages = "254--260",
journal = "IEEJ Transactions on Fundamentals and Materials",
issn = "0385-4205",
publisher = "The Institute of Electrical Engineers of Japan",
number = "3",

}

TY - JOUR

T1 - Effect of Glass Transition on Electrical Conduction Characteristics of Poly-L-lactic Acid

AU - Maeno, Yasumasa

AU - Yamaguchi, Yuya

AU - Hirai, Naoshi

AU - Ohki, Yoshimichi

AU - Tanaka, Toshikatsu

AU - Tajitsu, Yoshiro

AU - Kohtoh, Masanori

AU - Okabe, Shigemitsu

PY - 2005

Y1 - 2005

N2 - The temperature dependence of electrical conduction current in additive-free poly-L-lactic acid was measured from 20°C to 90°C under application of dc 2.5 kV. Although the current obeys the Arrhenius formula, a hump appears in 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. Even under short-circuit condition, a similar hump alone appears if the sample was poled by a dc voltage beforehand. From these results, it is assumed 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. The fact that polar groups, mainly carbonyl groups, in the sample really changed their directions was confirmed by Fourier-transform infrared spectroscopy. The permittivity also increases around 74°C. These facts indicate that the number of dipoles, which become possible to rotate toward the direction of electric field, is increased by the glass transition.

AB - The temperature dependence of electrical conduction current in additive-free poly-L-lactic acid was measured from 20°C to 90°C under application of dc 2.5 kV. Although the current obeys the Arrhenius formula, a hump appears in 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. Even under short-circuit condition, a similar hump alone appears if the sample was poled by a dc voltage beforehand. From these results, it is assumed 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. The fact that polar groups, mainly carbonyl groups, in the sample really changed their directions was confirmed by Fourier-transform infrared spectroscopy. The permittivity also increases around 74°C. These facts indicate that the number of dipoles, which become possible to rotate toward the direction of electric field, is increased by the glass transition.

KW - biodegradable polymer

KW - dielectric property

KW - electrical conduction

KW - glass transition

KW - poly-L-lactic acid

UR - http://www.scopus.com/inward/record.url?scp=33845875867&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33845875867&partnerID=8YFLogxK

U2 - 10.1541/ieejfms.125.254

DO - 10.1541/ieejfms.125.254

M3 - Article

VL - 125

SP - 254

EP - 260

JO - IEEJ Transactions on Fundamentals and Materials

JF - IEEJ Transactions on Fundamentals and Materials

SN - 0385-4205

IS - 3

ER -