Study of Thermally Stimulated Current in Fibrous Poly(DL-Lactic Acid) Films Exhibiting Piezoelectric-Like Behavior

Nobeshima, Taiki; Ishii, Yuya; Sakai, Heisuke; Uemura, Sei; Yoshida, Minoru

doi:10.2494/photopolymer.28.369

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…TSC measurements were carried out to confirm the existence of a spontaneous polarization in the electrospun fibrous mat and its thermal relaxation and=or ion detrapping of the electret. [31][32][33] If the fibrous mat exhibits a spontaneous polarization in the as-deposited state, a thermally stimulated current owing to its polarization relaxation=detrapping can be observed by heating. This experimental result is shown in Fig.…”

Section: Tsc Measurementsmentioning

confidence: 99%

Electrospun poly(methyl methacrylate) fibrous mat showing piezoelectric properties

Nobeshima

Ishii

Sakai

et al. 2018

Jpn. J. Appl. Phys.

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A piezoelectric effect, such as actuation behavior with voltage application, could be observed from a poly(methyl methacrylate) (PMMA) fibrous mat fabricated by electrospinning. This fibrous mat increased or decreased its thickness in accordance with the polarity of the applied voltage, which appears to be an inverse piezoelectric effect. The appearance d T constant was as large as 8.5 nm/V owing to the softness of the fibrous structure, and the coupling constant K T = 0.31 indicated its efficient piezoelectric property. This piezoelectric behavior was repeatedly observed to be stable at room temperature. In addition, the polarization components of the fibrous mat, which are considered to be the origin of its piezoelectric effect, and its relaxation behavior were confirmed from the results of thermally stimulated current measurements.

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Section: Tsc Measurementsmentioning

confidence: 99%

Electrospun poly(methyl methacrylate) fibrous mat showing piezoelectric properties

Nobeshima

Ishii

Sakai

et al. 2018

Jpn. J. Appl. Phys.

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“…In contrast, racemic mixture of PLLA and PDLA, i.e., poly-DL-lactic acid (PDLLA), have not shown piezoelectricity. However, in our recent study, a PDLLA fiber film prepared by electrospinning, a simple method for the preparation of polymer nanofibers and/or non-woven fabrics of nanofibers, has been shown to have piezoelectric-like behavior [10,11]. The film, consisting of a number of randomly deposited PDLLA fibers, showed large strain-to-thickness direction, which was attributed to an inverse piezoelectric-like effect.…”

Section: Introductionmentioning

confidence: 99%

Polarized FT-IR Study of Uniaxially Aligned Electrospun Poly(DL-Lactic Acid) Fiber Films

Nobeshima

Sakai

Ishii

et al. 2016

J. Photopol. Sci. Technol.

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Randomly deposited or uniaxially aligned electrospun poly(DL-lactic acid) fibers were prepared, and the molecular orientation was characterized by polarized Fourier-transform infrared (FT-IR) spectroscopy. For randomly deposited fibers, the parallel polarized FT-IR spectrum was the same as that of the perpendicularly polarized spectrum, indicating that there was no specific molecular orientation in this electrospun film. In contrast, for the uniaxially aligned sample, IR band intensities and the positions of C-O-C stretching changed when the IR beam was polarized either parallel or perpendicular to the fiber axis. Because the C-O-C stretching is parallel to the polymer backbone, this change indicates that the polymer chain in the fiber was stretched and aligned. The dichroic ratio of the band at 1090 cm −1 , attributed C-O-C stretching, was 2.9. Furthermore, the high-frequency shift of the peaks in its perpendicularly IR spectra suggests that the polymer chains in the fiber were tightly packed during the electrospinning process.

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Study of Thermally Stimulated Current in Fibrous Poly(DL-Lactic Acid) Films Exhibiting Piezoelectric-Like Behavior

Abstract: Keyword: polylactic acid, electrospinning method, thermal stimulated current, piezoelectric-like effect

Cited by 2 publications

References 17 publications

Electrospun poly(methyl methacrylate) fibrous mat showing piezoelectric properties

Electrospun poly(methyl methacrylate) fibrous mat showing piezoelectric properties

Polarized FT-IR Study of Uniaxially Aligned Electrospun Poly(DL-Lactic Acid) Fiber Films

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