Piezoelectric Characteristics of Polymer Film Oriented under a Strong Magnetic Field

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The possibility has been indicated that polymers with helical chirality, such as poly-$\gamma$-benzyl-L-glutamate (PBLG) and poly-L-lactic acid (PLLA), exhibit a large shear piezoelectric constant. To attempt the realization of a PBLG membrane with a large piezoelectric constant, we fabricated the PBLG membrane oriented by magnetic field force. Concretely, the PBLG membranes were casted from 1,2-dichloroethane solution with various PBLG concentrations under the magnetic field generation equipment incorporating a superconducting magnet. First, the orientation of the chain molecules of the PBLG membranes obtained was observed macroscopically by means of a polarizing microscope (POM). The orientation of the chain molecules of the PBLG membranes was recognized for the case of casting from the PBLG 1,2-dichloroethane solution in the liquid crystal state. Also, from X-ray photograph measurements, it was found that the orientation direction of the chain molecules of PBLG was perpendicular to the magnetic field direction. We then measured the shear piezoelectric constant $d_{14}$ of the oriented PBLG membranes. With increasing the strength of the applied magnetic field in the casting process for the film preparation, ${d_{14}}^{*}$ of the PBLG membranes obtained increases. Finally, a large piezoelectric constant of 26 pC/N was found in the PBLG membrane. It is assumed that ${d_{14}}^{*}$ is not saturated even at the magnetic field of 10 T.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-09-15

Piezoelectric Characteristics of Polymer Film Oriented under a Strong Magnetic Field

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