Abstract
Poly-Gamma-benzyl-L-glutamate Poly methyl methacrylate (PBLG-PMMA) composite polymer, a new piezoelectric transduction material, was invented by Yu et al. In our previous study, we have shown that the body composed of this new material can be produced by simultaneous poling and curing of a homogeneous solution comprising Poly-Gamma-benzyl-L-glutamate(PBLG) and methyl methacrylate(MMA) via detachable molding. And, it was also shown that the piezoelectric coefficient(d33) of PBLG-PMMA composite is dependent on the PBLG concentration and the intensity of electric field applied during curing in molds. In this study, we attempt to improve piezoelectricity of PBLG-PMMA composite because the piezoelectric coefficient of PBLG-PMMA was only about one twentieth of that of PVDF and measure the dynamic behaviors of PBLG-PMMA bodies in order to investigate the feasibility to apply this composite to acoustic transducers. In order to improve the piezoelectricity, the PBLG concentration and the electric field intensity applied during fabrication processes are increased. Our efforts result in making the piezoelectric coefficient about three times higher than it in previous study. We also measured the dynamic behaviors of a PBLG-PMMA disk. Then, a Tonpilz transducer was designed, fabricated using PBLG-PMMA composite disks, and tested experimentally. [Work supported by Grant No. ADDUD080004DD.]
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