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

S. Hikosaka, H. Ishikawa, Yoshimichi Ohki

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    11 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Title of host publicationAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
    Pages497-500
    Number of pages4
    DOIs
    Publication statusPublished - 2008
    Event2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008 - Quebec City, QC
    Duration: 2008 Oct 262008 Oct 29

    Other

    Other2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008
    CityQuebec City, QC
    Period08/10/2608/10/29

    Fingerprint

    Permittivity
    Polarization
    Depolarization
    Biodegradable polymers
    Starch
    Temperature measurement
    Dielectric properties
    Glass transition
    Temperature
    poly(lactide)

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Electrical and Electronic Engineering

    Cite this

    Hikosaka, S., Ishikawa, H., & Ohki, Y. (2008). Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide). In Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP (pp. 497-500). [4772773] https://doi.org/10.1109/CEIDP.2008.4772773

    Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide). / Hikosaka, S.; Ishikawa, H.; Ohki, Yoshimichi.

    Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2008. p. 497-500 4772773.

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Hikosaka, S, Ishikawa, H & Ohki, Y 2008, Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide). in Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP., 4772773, pp. 497-500, 2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena, CEIDP 2008, Quebec City, QC, 08/10/26. https://doi.org/10.1109/CEIDP.2008.4772773
    Hikosaka S, Ishikawa H, Ohki Y. Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide). In Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2008. p. 497-500. 4772773 https://doi.org/10.1109/CEIDP.2008.4772773
    Hikosaka, S. ; Ishikawa, H. ; Ohki, Yoshimichi. / Effects of crystallinity on thermally stimulated current and complex permittivity of poly(L-lactide). Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP. 2008. pp. 497-500
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