Effect of crystallinity on electrical conduction characteristics of poly-L-lactic acid

F. Kato, S. Omori, M. Matsushita, Yoshimichi Ohki

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

    4 Citations (Scopus)

    Abstract

    Effect of crystallinity change on electrical conduction characteristics of poly-L-lactic acid was studied experimentally. The crystallinity was changed by thermal annealing. The lower crystallinity samples have more remaining charge than the higher crystallinity samples. Moreover, at 80 °C that is above their glass transition temperatures (Tg: 55-60 °C), the conductivity is much higher in the lower crystallinity sample than in the higher crystallinity sample. The low crystallinity sample shows two thermally stimulated current (TSC) peaks - one around Tg and the other at a temperature about 20 °C higher than Tg, while the higher crystallinity sample shows only the lower-temperature TSC peak. The TSC peak around Tg is attributable to the micro-Brownian motion that enables orientation of dipoles having the direction perpendicular to the polymer main chains, while the higher-temperature TSC peak seems attributable to the orientation and magnitude change of the end-to-end vector in the polymer main chain.

    Original languageEnglish
    Title of host publicationAnnual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
    Pages15-18
    Number of pages4
    DOIs
    Publication statusPublished - 2006
    Event2006 Conference on Electrical Insulation and Dielectric Phenomena, CEIDP - Kansas City, MO
    Duration: 2006 Oct 152006 Oct 18

    Other

    Other2006 Conference on Electrical Insulation and Dielectric Phenomena, CEIDP
    CityKansas City, MO
    Period06/10/1506/10/18

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    ASJC Scopus subject areas

    • Engineering(all)

    Cite this

    Kato, F., Omori, S., Matsushita, M., & Ohki, Y. (2006). Effect of crystallinity on electrical conduction characteristics of poly-L-lactic acid. In Annual Report - Conference on Electrical Insulation and Dielectric Phenomena, CEIDP (pp. 15-18). [4105359] https://doi.org/10.1109/CEIDP.2006.312051