Ferroelectric and Piezoelectric Properties of Blends of Poly(Vinylidene Fluoride Trifluoroethylene) and a Graft Elastomer

AbstractA piezoelectric polymeric blend system has been developed. The system contains two components: ferroelectric poly(vinylidene fluoride-trifluoroethylene) and graft elastomer. The remanent polarization, Pr, and the piezoelectric strain coefficient, d31, of the blends have been studied as a function of relative composition of the two components, temperature and frequency. Both blended copolymer and graft unit in the elastomer contribute to the total crystallinity of the blend-system, and hence to the remanent polarization and piezoelectricity. The piezoelectric strain coefficient, d31, of the blend systems shows dependence on both the remanent polarization and the mechanical stiffness, which in turn are determined by the fraction of the two components in the blends. This mechanism makes it possible for the piezoelectric strain response of the blend to be tailored by adjusting the relative composition. Although Pr of the copolymer is higher than that of the blends, the blend films containing 75 wt.% copolymer exhibit a higher d31 at room temperature, possibly due to their lower modulus. The blend films containing 50 wt.% copolymer exhibit a constant value of d31, from room temperature to 70°C.

Download Full-text

Effects of Coupling Agents on the Structure and Electrical Properties of PZT-Poly(vinylidene fluoride) Composites

10.20944/preprints201609.0064.v1 ◽

2016 ◽

Author(s):

Rui Li ◽

Liu Zhang ◽

Zhiliang Shi ◽

Jianzhong Pei

Keyword(s):

Vinylidene Fluoride ◽

Piezoelectric Properties ◽

Volume Ratio ◽

Relative Dielectric Constant ◽

Coupling Agents ◽

Pressing Method ◽

Maximum Value ◽

Poly Vinylidene Fluoride ◽

Piezoelectric Strain ◽

Piezoelectric Strain Constant

PZT-Poly(vinylidene fluoride) composites were prepared by hot-pressing method. Before addition, PZT particles were firstly modified with two different coupling agents. The micromorphology, microstructure, dielectric properties, and piezoelectric properties of the composites were characterized and investigated. Results indicated that PZT particles were homogeneously dispersed in the PVDF matrix by the addition of coupling agents. The electric properties of PZT-PVDF composites with NDZ-101 were the best. Especially when the volume ratio of the titanate coupling agent NDZ-101 was 1%, the piezoelectric strain constant d33 of PZT-PVDF composites reached maximum value 19.23pC/N; its relative dielectric constant εr was 67.45; at the same time its dielectric loss tanδ was 0.0766.

Download Full-text

Field-induced phase transition and its impact on the magnetoelectric effect in P(VDF-HFP)/Metglas laminates

MRS Proceedings ◽

10.1557/proc-1199-f06-24 ◽

2009 ◽

Vol 1199 ◽

Author(s):

David Sheng-Guo Lu ◽

Xin Zhou ◽

Zhao Fang ◽

Qiming Zhang

Keyword(s):

Phase Transition ◽

Electric Field ◽

Room Temperature ◽

Remanent Polarization ◽

Magnetoelectric Effect ◽

Vinylidene Fluoride ◽

Bias Field ◽

Magnetic Bias ◽

Field Range ◽

Poly Vinylidene Fluoride

AbstractThe field-induced phase transition driven by electric field was observed in poly(vinylidene fluoride – hexafluoropropylene) (P(VDF-HFP)) 90/10 wt% copolymers. Experimental results indicated that the electric field may remarkably affect the remanent polarization in terms of changing the D-E loop forms from double loops to single loop, starting from 68 MV/m, and completing at 216 MV/m. It was found that the remanent polarization as well as the piezoelectric constant d31 had a linear relationship with the poling electric field in above electric field range. Thus the magnetoelectric (ME) coupling coefficient ME in P(VDF-HFP)/Metglas laminates increased with the poling electric field. Moreover, the cyclic poled ME device demonstrated different peak d.c. magnetic bias field HDC on the ME - HDC curves from conventional room temperature poled ones. The peak ME coefficient obtained was 4 V/cm Oe.

Download Full-text

The Influence Mechanism of Temperature and Storage Period on Polarization Properties of Poly (Vinylidene Fluoride–Trifluoroethylene) Ultrathin Films

Membranes ◽

10.3390/membranes11050301 ◽

2021 ◽

Vol 11 (5) ◽

pp. 301

Author(s):

Xingjia Li ◽

Zhi Shi ◽

Xiuli Zhang ◽

Xiangjian Meng ◽

Zhiqiang Huang ◽

...

Keyword(s):

Ultrathin Films ◽

Remanent Polarization ◽

Vinylidene Fluoride ◽

Storage Period ◽

Testing Temperature ◽

Fatigue Properties ◽

Inhibition Mechanism ◽

Poly Vinylidene Fluoride ◽

High Level ◽

And Storage

The effect of testing temperature and storage period on the polarization fatigue properties of poly (vinylidene fluoride-trifluoroethylene) (P(VDF–TrFE)) ultrathin film devices were investigated. The experimental results show that, even after stored in air for 150 days, the relative remanent polarization (Pr/Pr(0)) of P(VDF–TrFE) of ultrathin films can keep at a relatively high level of 0.80 at 25 °C and 0.70 at 60 °C. To account for this result, a hydrogen fluoride (HF) formation inhibition mechanism was proposed, which correlated the testing temperature and the storage period with the microstructure of P(VDF–TrFE) molecular chain. Moreover, a theoretical model was constructed to describe the polarization fatigue evolution of P(VDF–TrFE) samples.

Download Full-text

Preparation and Characterization of Modified PVDF-g-PSSA Membrane

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.152-153.44 ◽

2010 ◽

Vol 152-153 ◽

pp. 44-50 ◽

Cited By ~ 2

Author(s):

Gui Bao Guo ◽

Er Ding Han ◽

Sheng Li An

Keyword(s):

Relative Humidity ◽

Sodium Silicate ◽

Room Temperature ◽

Proton Exchange Membrane ◽

Vinylidene Fluoride ◽

Proton Exchange ◽

Poly Vinylidene Fluoride ◽

Relative Humidity Range ◽

Exchange Membrane

A new method based on a solution graft technique was used to prepare poly (vinylidene fluoride) grafted polystyrene sulfonated acid (PVDF-g-PSSA) proton exchange membrane. Polystyrene is grafted into PVDF modified by plain sodium silicate (Na4SiO4). There is a linear relationship between the degree of grafting and the content of Na4SiO4. Fourier transform infrared spectroscopy is used to characterize changes of the membrane's microstructures after grafting and sulfonation. The morphology of the membrane's microstructures after grafting and sulfonation is studied by scanning electrolytic microscope (SEM). The effect of plain sodium silicate (Na4SiO4) concentration and relative humidity on the conductivity of the electrolyte was investigated by the impedance at room temperature. The results show that the styrene has been grafted into PVDF. The conductivity of PVDF-g-PSSA electrolyte doped 10% plain sodium silicate (Na4SiO4) is 0.016 S/cm at room temperature. The conductivity of the electrolyte changes slightly at a relative humidity range of 20%-70%. The weightlessness of PVDF-g-PSSA electrolyte heated to 40°C was less than 2%, which indicated that water capacity was good.

Download Full-text

Development of self-poled PVDF/MWNT flexible nanocomposites with a boosted electroactive β-phase

New Journal of Chemistry ◽

10.1039/d0nj02003f ◽

2020 ◽

Vol 44 (34) ◽

pp. 14578-14591

Author(s):

Akash M. Chandran ◽

S. Varun ◽

Prasanna Kumar S. Mural

Keyword(s):

Vinylidene Fluoride ◽

Piezoelectric Properties ◽

Nanocomposite Films ◽

Fabrication Method ◽

Β Phase ◽

Poly Vinylidene Fluoride ◽

Dielectric And Piezoelectric Properties

In the present study, we report a simple fabrication method for poly(vinylidene fluoride) PVDF/MWCNT flexible nanocomposite films with a boosted electroactive phase that enhanced the dielectric and piezoelectric properties.

Download Full-text

Significance of Micro and Nano PZT Particles on Dielectric and Piezoelectric Properties of PZT-PVDF Composites

International Journal of Advances in Scientific Research ◽

10.7439/ijasr.v2i3.3099 ◽

2016 ◽

Vol 2 (3) ◽

pp. 64

Author(s):

GOWDHAMAN P ◽

ANNAMALAI V ◽

HARESH M PANDYA ◽

KUMAR P R

Keyword(s):

Piezoelectric Properties ◽

Compositional Analysis ◽

X Rays ◽

Hot Press ◽

X Ray Diffraction ◽

Fixed Temperature ◽

Voltage Coefficient ◽

Piezoelectric Strain ◽

Strain Coefficient ◽

Dielectric And Piezoelectric Properties

PZT-PVDF composites were prepared using different particle size of PZT and a hot press apparatus has been used for making samples. The structural and compositional analysis of the composite sample was done by using Scanning Electron Microscope (SEM) and Energy Dispersive Analysis of X-rays (EDAX) respectively. The grain size of the ball milled PZT powder was analyzed using powder X-Ray Diffraction (XRD). The samples were poled at a fixed temperature for about an hour under different poling fields. The dielectric constant (?r) and the piezoelectric properties like piezoelectric strain coefficient (d33) and voltage coefficient (g33) of composite have been analyzed.

Download Full-text

Thin poly(ionic liquid) and poly(vinylidene fluoride) blend films with ferro- and piezo-electric polar γ-crystals

Journal of Polymer Science Part B Polymer Physics ◽

10.1002/polb.24593 ◽

2018 ◽

Vol 56 (10) ◽

pp. 795-802 ◽

Cited By ~ 3

Author(s):

Vimal K. Tiwari ◽

Yujeong Lee ◽

Giyoung Song ◽

Kang Lib Kim ◽

Youn Jung Park ◽

...

Keyword(s):

Ionic Liquid ◽

Vinylidene Fluoride ◽

Blend Films ◽

Poly Vinylidene Fluoride ◽

Poly Ionic Liquid ◽

Piezo Electric

Download Full-text

Fabrication of Piezoelectric PVDF/PAR Composites Using a Sheath-Core Fiber Method

Polymers ◽

10.3390/polym12102214 ◽

2020 ◽

Vol 12 (10) ◽

pp. 2214

Author(s):

Min Hong Jeon ◽

Yu Rim Lee ◽

Hyeon Soo Lim ◽

Jong Sung Won ◽

Seung Goo Lee

Keyword(s):

Vinylidene Fluoride ◽

Piezoelectric Properties ◽

Testing Machine ◽

X Ray Diffraction ◽

Composite Surface ◽

Fiber Assembly ◽

Universal Testing ◽

Poly Vinylidene Fluoride ◽

Core Fiber ◽

Growing Conditions

We report the preparation of sheath-core type fibers made from poly(vinylidene fluoride) (PVDF) and polyarylate (PAR) using melt conjugate spinning to fabricate piezolectric composites. The morphology of this sheath-core fiber was determined through scanning electron microscopy. Subsequently, by the compression molding of the PVDF/PAR sheath-core fiber assembly, we fabricated PVDF/PAR composites exhibiting piezoelectric properties. For enhancing the piezoelectric properties, we increased the concentration of PVDF β-crystalline phase in the PVDF/PAR composite through poling post-treatments. The resulting crystal structure of PVDF was confirmed through infrared spectroscopy and X-ray diffraction. A universal testing machine was employed to measure the tensile properties of the PVDF/PAR composites. Finally, through a hydrothermal growing method, ZnO was coated on the composite surface to enhance the piezoelectric properties, which were subsequently optimized by varying the hydrothermal growing conditions.

Download Full-text