Piezoelectricity of Poly(l-lactic Acid) Composite Film with Stereocomplex of Poly(l-lactide) and Poly(d-lactide)

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概要

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• The piezoelectricity of a film of the eco-material poly(l-Lactic acid) (PLLA) with high transparency and flexibility has been noted for its possibility of application to new types of devices used in mobile equipment. However, for its application, there are many difficult problems to be solved, because the PLLA film has poor thermal stability. To change the high-order structure of the PLLA film, thus realizing an improvement in the temperature dependence of its piezoelectricity, a composite film with a stereocomplex crystal (SC) formed from PLLA and poly(d-lactide acid) (PDLA) molecules was fabricated. As a result, we obtained a composite film with a stable piezoelectric temperature dependence compared with a pure PLLA film. To analyze its piezoelectric temperature dependence, we first observed the high-order structure of the composite film using a polarized microscope (POM). However, we did not find any difference between the high-order structures of the composite film and the pure PLLA film. In contrast, from observation by atomic force microscopy (AFM), it was found that the grain structure in the composite film became more homogeneous than that in the pure PLLA film. These experimental results indicate that, by changing the high-order structure through a compound with SC, the external stress always has a constant effect over a wide temperature range and, as a result, the induced polarization is constant in the composite film. Thus, the composite film shows excellent thermal stability of piezoelectricity compared with the pure PLLA film.

• 2010-09-25

著者

• IMOTO Kenji

  Imoto Mechanical Engineering Co., Ltd.

• DATE Munehiro

  Kobayashi Institute of Physical Research

• FUKADA Eiichi

  Kobayashi Institute of Physical Research

• Naka Kyohei

  Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke, Kamikyou, Kyoto 602-8315, Japan

• Yoshida Tetsuo

  Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke, Kamikyou, Kyoto 602-8315, Japan

• Tahara Komei

  Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke, Kamikyou, Kyoto 602-8315, Japan

• Uehara Yusuke

  Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke, Kamikyou, Kyoto 602-8315, Japan

• Kataoka Shingo

  Imoto Mechanical Engineering Co., Ltd., 501 Tsukinuke, Kamikyou, Kyoto 602-8315, Japan

• Tajitsu Yoshiro

  Electrical Engineering Department, Graduate School of Science and Engineering, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan

• Tajitsu Yoshiro

  Electrical Engineering Department, Graduate School of Engineering, Kansai University, 3-3-35 Yamate, Suita, Osaka 564-8680, Japan

• Date Munehiro

  Kobayashi Institute of Physical Research, 3-20-1 Higashi-Motomachi, Kokubunji, Tokyo 185-0022, Japan

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