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• W4283375800 endingPage "125095" @default.
• W4283375800 startingPage "125095" @default.
• W4283375800 abstract "Piezoelectric resonance spectroscopy was used to evaluate the face shear piezoelectricity and its relaxation for structurally controlled poly-l-lactic acid (PLLA) films. We prepared samples by uniaxial drawing at 80 °C for a ratio of 2–6 and annealed at temperatures above glass transition (Tg = 60 °C) to below melting (Tm = 170 °C) for 1 hour. The degrees of crystallinity Xc and orientation Fc by X-ray diffraction were controlled over a broad range to reach Xc = 0.8 and Fc = 0.9. We measured broadband dielectric spectra where the piezoelectric resonance was observed superimposed on dielectric relaxation. Analyses of the resonance spectra for 45°-cut square sample resulted in the determination of the face-shear piezoelectric constants e14 and d14, as well as the elastic shear compliance s44 and stiffness c44. At room temperature, e14 was shown to be proportional to a product of Xc*Fc, whereas d14 demonstrated saturation due to an increase in c44. By extrapolating to Xc*Fc = 1, the e14c = 27 mC/m2 of PLLA crystal was determined. As the temperature increases, piezoelectric relaxation due to non-crystalline segmental motion was observed as well as dielectric and elastic relaxation. It was found that e14 decreased in a similar manner to c44 whereas d14 increased slightly with increasing temperature. The temperature dispersions of e14, d14 and c44 were reproduced using an equivalent three-spring model consisting of a crystalline piezoelectric spring connected by series and parallel non-crystalline relaxational springs based on the temperature-frequency reduction rule and the VTF-type dielectric relaxation time. The findings revealed key information on the ratio of noncrystalline phases connected in series and parallel to the oriented crystalline phase." @default.
• W4283375800 created "2022-06-25" @default.
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• W4283375800 date "2022-07-01" @default.
• W4283375800 modified "2023-09-26" @default.
• W4283375800 title "Quantitative study on the face shear piezoelectricity and its relaxation in uniaxially-drawn and annealed poly-l-lactic acid" @default.
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• W4283375800 doi "https://doi.org/10.1016/j.polymer.2022.125095" @default.
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