<scp>PVDF</scp> piezoelectric voltage coefficient <i>in situ</i> measurements as a function of applied stress

Gusarov, Boris; Gusarova, Elena; Viala, B.; Gimeno, L.; Cugat, Orphée

doi:10.1002/app.43248

Cited by 25 publications

(40 citation statements)

References 23 publications

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“…Similarly, sensitivity of d31 with respect to annealing temperature and extraction force are presented in Figure 9a,b, respectively. As expected in general use of PVDF, sensitivity d31 is much higher than that of d33 [39,66,67].…”

Section: Sensitivity Of Pvdf Sensorsupporting

confidence: 65%

Using Annealing Treatment on Fabrication Ionic Liquid-Based PVDF Films

et al. 2020

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In this study, a simple method to obtain pure β-phase directly from the melt process is proposed. A series of PVDF and ionic liquid (IL) was prepared by a solvent casting method with appropriate associated with the subsequent annealing treatment. IL plays a role of filler, which can create strong electrostatic interaction with PVDF matrix and directly induce β-phase crystallization on the PVDF during the melt. PVDF film sample is immersed in hot water for annealing treatment at different temperatures (25 °C to 70 °C). We found that annealing in high temperatures especially can not only increase more IL inserted into the amorphous region of polymer matrix to make more phase transformation, but also accelerate IL removal. Characteristics and performance of the PVDF films were investigated by use of FTIR, XRD, SEM, and AFM. Piezoelectric coefficient d33 as well as d31, degree of crystallinity, and sensitivity are measured in experiment to verify the performance of PVDF film.

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Section: Sensitivity Of Pvdf Sensorsupporting

confidence: 65%

Using Annealing Treatment on Fabrication Ionic Liquid-Based PVDF Films

et al. 2020

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“…The piezoelectric coefficient d 33 can be calculated by

d_{33} = \frac{Q}{F_{i}} = \frac{C . V}{F_{i}}, normalw normalh normale normalr normale C = ɛ_{r} . ɛ_{o} \frac{A}{t}

where Q is the electric charge; C is the capacitance of the PVDF film; F i represents the impact force; V is the measured output voltage; A is the effective area with width w = 15 mm and length l = 25 mm; t is the thickness listed in Table ;

ɛ_{r}

is relative permittivity with value of 12;

ɛ_{0}

(=8.854 × 10 −12 F/m) is the permittivity of free space . The piezoelectric d 31 coefficient of PVDF can be calculated by

d_{31} = ɛ_{r} . ɛ_{o} . g_{31} = {true(ɛ}_{r} . ɛ_{o} true) . \frac{V}{t . σ} = true(ɛ_{r} . ɛ_{o} true) . \frac{V w}{F_{e}}

where

g_{31}

is the piezoelectric voltage coefficient;

σ true(= F_{e} / t w true)

is the tensile stress; F e is extraction force. The applied extraction force F e is measured as 0.92 N by the commercial three‐dimensional force sensor (PCB Piezotronic, model 208c01).…”

Section: Resultsmentioning

confidence: 99%

Characteristic analysis of biaxially stretched PVDF thin films

Ting¹,

Suprapto²,

Chiu³

et al. 2018

J of Applied Polymer Sci

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By use of biaxial stretching process of poly(vinylidene fluoride) fabrication to gain high piezoelectricity is the focus in this article. The influence of different stretch ratio and temperature are investigated and compared to uniaxial stretching process. The Fourier transform infrared spectroscopy and X‐ray diffraction are used to observe the β‐phase fraction and the degree of crystallinity. The piezoelectric coefficients (d33, d31) and the sensitivity are also measured. All the above characteristic examinations show the same consequences that equi‐biaxial stretching process employed with same stretch ratio in both axial directions of poly(vinylidene fluoride) fabrication is the focus in this article. And heating temperature would have adequate piezoelectricity approximate to uniaxial stretching. In observation of surface morphology by using scanning electron microscopy, uniformity in biaxial direction is gained. However, biaxial stretching with higher stretch ratio of R = 4 × 4 would produce porosity and crack. Via atomic force microscopy, biaxial stretching with higher stretch ratio attains better surface chain orientation and smoothness. To sum up, the biaxial stretching approach has the advantage of low stretch ratio requirement to preserve good fabrication quality. Set up with stretch ratio in‐between R = 3 × 3 and R = 4 × 4 at 80 °C is suggested to use in biaxial stretching. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46677.

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“…Taking into account the geometric specifications described in [3], samples for our tests are then cut in the 100 μm PLLA film and the 40 μm commercial PVDF film with a length to width ratio upper than 8. The cut samples are then glued with cyanoacrylate glue into 3D-printed clamps and dried for 24 h as shown in Figure 1.…”

Section: Sample Preparationmentioning

confidence: 99%

“…In this work, we consider a new approach [3] to measure directly the g31 coefficient with great reliability (error under 10%). This method, coupled with dielectric constant measurement of the material, allows the determination of the d31 coefficient, which is the one mainly used to express the piezoelectric performance of materials.…”

Section: Introductionmentioning

confidence: 99%