Piezoelectricity and Pyroelectricity of Polymers

Wada, Yasaku; Hayakawa, Ritsuko

doi:10.1143/jjap.15.2041

Cited by 238 publications

(74 citation statements)

References 29 publications

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“…To confirm that these current peaks are derived from the polarization switching of the P(VDF-TrFE) molecules, a positive voltage was applied to device II [P(VDF-TrFE) 21 wt %] three consecutive times (Fig. 7).…”

Section: / Degmentioning

confidence: 90%

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Anomalous piezoelectric properties of poly(vinylidene fluoride–trifluoroethylene)/ionic liquid gels

Fukagawa

Koshiba

Fukushima

et al. 2018

Jpn. J. Appl. Phys.

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Piezoelectric gels were prepared from low-volatile ionic liquid (IL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([Emim][TFSI]) gels, and their structural, ferroelectric, and piezoelectric properties were investigated. Poly(vinylidene fluoride-trifluoroethylene) P(VDF-TrFE)/IL gels were formed using thermally reversible physical gels. The structural characterization indicated that the P(VDF-TrFE) molecules in the gels predominantly formed a ferroelectric phase (Form I) of P(VDF-TrFE). Polarization switching peaks were clearly observed using a three-layer stacked device structure. The coercive field of the P(VDF-TrFE)/IL gels substantially decreased to 4-9 MV/m, and their remnant polarizations were maintained at 63-71 mC/m 2 , which is similar to that for typical solid-state P(VDF-TrFE). Finally, the P(VDF-TrFE)/IL gel films exhibited a piezoelectric response, and the highest piezoelectric coefficient was >300 pm/V at an applied voltage frequency of 4 kHz.

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Section: / Degmentioning

confidence: 90%

“…[15][16][17][18][19][20][21][22][23] Ferroelectric Form I (β phase), with an all-trans configuration in P(VDF-TrFE), exhibits the best ferroelectric and piezoelectric properties. A sandwich device prepared using solidstate P(VDF-TrFE) films exhibited both direct and inverse piezoelectric effects.…”

Section: Introductionmentioning

confidence: 99%

Anomalous piezoelectric properties of poly(vinylidene fluoride–trifluoroethylene)/ionic liquid gels

Fukagawa

Koshiba

Fukushima

et al. 2018

Jpn. J. Appl. Phys.

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“…[27][28][29] the two peaks in the copolymer appear as a result The pyroelectric coefficient (P) was computed of some sort of solidarity polarization due to the from the measured pyroelectric current using the previously mentioned ''bond heterogeneity.'' formula The current released during a TSDC run is a measure of the degree of polarization of the sample which in turn is conditioned by the degree P Å 0I/AB (2) 3811 / 8E70$$0011 07-31-97 14:25:10 polaa W: Poly Applied work may allow to conclude that the binary polymer forms homogeneous dilute solution in DMF, and on the removal of the solvent, a nonequilibrium, single-phase structure remains.…”

Section: Thermally Stimulated Depolarization Currentsmentioning

confidence: 99%

Electrical studies on PVA-PE copolymer

Ibrahim

Attia

Abo‐Ellil

et al. 1997

J. Appl. Polym. Sci.

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SYNOPSISThe electrical transport properties including electrical conductivity ( s), dielectrical constant (e), thermally stimulated depolarization current (TSDC), and pyroelectric coefficient ( P) of a poly(vinyl alcohol)-polyethylene (PVA-PE) copolymer were studied in the temperature range 296-433K. Two stages of behavior have been observed with activation energies 1.49 and 0.05 eV. Discussion of conduction mechanism was carried out in terms of relevant theories. The existence of a relaxation peak in e versus T relation has been analyzed taking into consideration space charge effects and dipole orientation phenomena. The TSDC spectra showed two peaks with differing intensity and position independent of field intensity. Pyroelectric current data provide further support to space charge effects.

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“…4 For this purpose, changes in the free volume of the crystalline and amorphous parts with pressure are the most important quantities that had to be evaluated. Furthermore, according to the composite model theory, 5 P-V-Tequations of state for the two parts and the pressure dependence of their dielectric properties should be closely related to piezoelectric and pyroelectric properties under high pressure.…”

Section: Procedures Of Analysismentioning

confidence: 99%

Equations of State for Poly(vinylidene fluoride)

Tanaka

Takayama

Okamoto

et al. 1982

Polym J

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ABSTRACT:Equations of state were determined separately for the crystalline and amorphous parts of Form I and II samples of poly(vinylidene fluoride), assuming a linear relation between the specific volume and the degree of crystallinity. The compressibility data of Form II bulk samples were obtained by dilatometry, and those of the Form I and II crystals were determined by X-ray diffraction at high temperature. Ultrasonic sound velocities ofF orm I and II crystals were obtained as functions of pressure and temperature, using the logarithmic mixture law for sound velocity. The pressure dependences of the Griineisen constants y and interchain specific heats C,.,., were derived for Form I and II crystals at room temperature. Form I crystals had somewhat larger compressibilities than those of Form II throughout the whole range of temperature investigated, and had a larger y and smaller c,.,., at atmospheric pressure, but smaller y at high pressures above 2000 kgcm-2 • The pressure dependences of y and C1.,., were stronger in Form I than in Form II. On the basis of these facts, the difference in behavior of the lattice vibrations of these two crystals under high pressure is discussed.KEY WORDS Equations of State I Poly(vinylidene fluoride) I Thermal Expansion Coefficient I Compressibility I Griineisen Constant I Interchain Specific Heat I Lattice Vibration I PROCEDURE OF ANALYSIS During the last decade, poly(vinylidene fluoride) (PVDF) has received much attention because of its extraordinary piezoelectric and pyroelectric properties and wide practical use. Recently, the ferroelectric nature of PVDF has been reported by several research groups 1 -3 through observation of the switching current and the P-E hysteresis loop. One very interesting problems that became evident from these observations is the ferroelectric polarization reversal mechanism. At our laboratory, the polarization switching current at high pressure was studied to. obtain a basic understanding of this mechanism. 4 For this purpose, changes in the free volume of the crystalline and amorphous parts with pressure are the most important quantities that had to be evaluated. Furthermore, according to the composite model theory, 5 P-V-Tequations of state for the two parts and the pressure dependence of their dielectric properties should be closely related to piezoelectric and pyroelectric properties under high pressure.PVDF is a semicrystalline polymer. To estimate the specific volumes of the crystalline and amorphous parts, it is mandatory to use the following linear relation between the specific volumes of a bulk sample Vb, the crystalline part Vc, and the amorphous part v. at pressure P,where x is the degree of crystallinity and the subscript zero stands for the corresponding values under atmospheric pressure at a given temperature. Vb(P) and Vc(P) were determined, respectively, by dilatometric and X-ray diffraction experiments under various pressures. The degree of crystallinity was determined by hydrostatic weighing. Thus, the isotperms of the crystal...

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Piezoelectricity and Pyroelectricity of Polymers

Cited by 238 publications

References 29 publications

Anomalous piezoelectric properties of poly(vinylidene fluoride–trifluoroethylene)/ionic liquid gels

Anomalous piezoelectric properties of poly(vinylidene fluoride–trifluoroethylene)/ionic liquid gels

Electrical studies on PVA-PE copolymer

Equations of State for Poly(vinylidene fluoride)

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