New Piezoelectric Polymers.

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  • Fukada Eiichi
    Kobayasi Institute of Physical Research, Kokubunji, Tokyo 185, Japan Institute for Super Materials, ULVAC Japan Ltd. Tokodai, Tsukuba 300–26, Japan

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Four kinds of piezoelectric polymers are introduced. Submicron thin films of polyurea are prepared by vapor deposition polymerization. Poled films of aromatic polyurea exhibit the piezoelectric constant d31=20 pC/N, which is almost independent of temperature in the range of 100 to 200°C. Aliphatic polyureas show a ferroelectric hysteresis with a coercive field of about 100 MV/m. Single crystalline films of a copolymer of vinylidene fluoride and trifluoroethylene were prepared by annealing elongated films at a paraelectric temperature range avoiding the side surface contacts. No lamella structures were present and the crystallinity was near 100%. The large electromechanical coupling factors k33=0.3 and k31=0.1 were observed. A large electrostrictive constant R=2.6× 10-17 m2/V2 was observed for polyurethane. With a dc bias field of 15 MV/m, a piezoelectric constant of d33=600 pC/N was obtained, which was larger than that of PZT. A shear piezoelectric constant d14=-10 pC/N was obtained for oriented films of poly-L-lactic acid, which were optically active and biodegradable. After poling, this polymer showed the tensile piezoelectricity and pyroelectricity.

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