Direct piezoelectric response of piezopolymer polyvinylidene fluoride under high mechanical strain and stress

Abstract

We show that the nonlinear piezoelectric response of polyvinylidene fluoride (PVDF) exhibits quite different behavior compared with the piezoceramics. Instead of increasing linearly with the stress amplitude Tac, d31 coefficient raises with Tac2. Furthermore, the nonlinear effect does not set in until the strain increases beyond 0.3%, indicating very strong barriers to the domain wall motions in PVDF. The electromechanical coupling factor k31 also exhibits an increase with stress. Furthermore, the piezopolymer can withstand more than 3% strain without degrading the piezoelectric responses.

Biodegradable Electrospun Poly(lactic acid) Nanofibers for Effective PM 2.5 Removal

“…To investigate the piezoelectricity of the PLLA fiber membrane (PFM), the piezoelectric coefficients d 14 of the electrospun PLLA, PDLA, and PDLLA were measured using a labdesigned experimental setup as described in previous publications. [24][25][26] At first, Au electrodes were sputter-coated on the both sides of the sample along the shear direction. During the test, the applied mechanical force on the sample along the shear direction was measured by a load cell and the generated electric charges were recorded by a lock-in amplifier (SR830, Stanford Research Systems Inc., CA, USA)].…”

“…The piezoelectric coefficient d 14 of the nanofibers was measured using a labdesigned piezoelectric measurement system described in our previous publications. [24][25][26] All the nanofibers were compressed into thin films for the piezoelectric measurement.…”

Electrospun Poly(l‐Lactic Acid) Nanofibers for Nanogenerator and Diagnostic Sensor Applications

“…For piezoelectric coefficient d 33 measurement, both of the fiber bundle tips have to be sputtered with Au electrodes before the measurement because the 3 direction (the polarization direction) is along the fiber length direction. The equation used to calculate the piezoelectric coefficient d 33 is as followswhere T 0 is the stress applied on the materials and I 0 is the current generated from the PLLA fiber tips.…”

Biomedical sensor properties of flexible PolyVinyliDene flouride

“…The commercially available Z direction thickness, t, is usually one of three micron values, 28, 52 or 100 with silver ink metallization on the top and bottom surfaces [4], though variations exist [5]. Although there are four structural versions for piezoelectric PVDF the standard one is for the mm2 crystal structure for which the matrices take the following form with the constants found from various sources [2, p.3] - [8] (often with conflicting values) to be roughly. Of considerable interest are the coupling coefficients, especially the thickness, k 31 , and the transverse, k 33 , ones, given by…”

“…However, large stresses and strains are often used in which case a square-law behavior is found in s 11 and d 31 [8] as well as in temperature change, which have [9] Permission to make digital or hard copies of part or all of this work for personal or classroom use is granted without fee provided that copies are not made or distributed for profit or commercial advantage and that copies bear this notice and the full citation on the first page. Copyrights for third-party components of this work must be honored.…”