Effects of Crystallinity on Dielectric Properties of Poly (L-lactide)

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  • Hikosaka Saki
    Department of Electrical Engineering and Bioscience, Waseda University
  • Ishikawa Hiroto
    Department of Electrical Engineering and Bioscience, Waseda University
  • Ohki Yoshimichi
    Department of Electrical Engineering and Bioscience, Waseda University

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  • Ｌ型ポリ乳酸の結晶化度が誘電特性に与える影響
  • Lガタ ポリ ニュウサン ノ ケッショウカド ガ ユウデン トクセイ ニ アタエル エイキョウ

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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 (εr') and a peak in its imaginary part (εr”) 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 εr' and the peak in εr” are ascribable to the segmental-mode relaxation.

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