Fabrication of Piezoelectric-Rubber of Large Piezoelectric Property
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Fabrication of Piezoelectric-Rubber of Large Piezoelectric Property Shogo Mamada1, Naoyuki Yaguchi1, Masanori Hansaka1, Masafumi Yamato2 and Hirohisa Yoshida2 1 Materials Technology Division, Railway Technical Research Institute, 2-8-38 Hikari-cho, Kokubunji, Tokyo, 185-8540, Japan 2 Department of Applied Chemistry, Graduate School of Urban Environmental Science, Tokyo Metropolitan University, 1-1 Minami-Osawa Hachioji Tokyo 192-0397, Japan ABSTRACT In the previous investigation, piezoelectric properties of the ‘Aligned-type’ in which the piezoelectric-ceramic particles are formed in linear aggregates in the rubber, remarkable piezoelectric properties were confirmed. In this investigation, to further enhance the piezoelectric properties of the Aligned-type, the influence of the matrix properties was investigated. The properties on which we focused were the dielectric constant and the Young’s modulus. Four kinds of matrix materials whose dielectric constant and Young’s modulus are different from each other; Silicone gel, Silicone rubber, Urethane rubber and Poly-methylmethacrylate were investigated. As a result of measurement of the piezoelectric strain constant d33 of the Aligned-Type, it was confirmed that though the influence of the dielectric constant of the matrix material was small, the lower the Young’s modulus of the matrix was, the higher d33 was. INTRODUCTION Recently, development of flexible and unbreakable piezoelectric materials which can be used at various places has been expected [1-4]. In these materials, we focuse on piezoelectricrubber which has flexibility, ease in fabrication and capability to take on arbitrary form [5,6]. However the piezoelectric properties of piezoelectric-rubber are too poor when it is fabricated in a normal method, hence plenty of piezoelectric-ceramic particles need to be mixed into rubber to enhance piezoelectric properties. Therefore, to enhance piezoelectric properties of piezoelectric-rubber with fewer piezoelectric-ceramic particles, we investigate a method in which piezoelectric-ceramic particles form the linear aggregates in rubber by means of an electric field. It is denoted by ‘Aligned-Type’ in this paper. As a result, the piezoelectric properties of the Aligned-Type are more remarkable than the Un-Aligned-Type in which piezoelectric-ceramic particles are not formed in linear aggregates. However, the properties of the previous Aligned-type, still isn’t enough to use as the sensor or actuator. Therefore, to further enhance the piezoelectric properties of the Aligned-Type, we investigated the influence of matrix material properties on the piezoelectric properties of the Aligned-Type. In this investigation, the dielectric constant and the Young’s modulus was focused upon as the matrix material properties. It was considered that the properties of the Aligned-Type were greatly influenced by electric properties such as the dielectric constant and the mechanical properties such as the Young’s modulus of the matrix material. In this study,
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the Aligned-Type using four
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