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

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.

Effects of Barium Substitution on the Structure and Properties of PSZT Piezoelectric Ceramics

2010 ◽  
Vol 650 ◽  
pp. 103-108
Author(s):  
Yu Hua Feng ◽  
Tie Zheng Pan ◽  
Xiang Qian Shen ◽  
Hao Jie Song ◽  
Li Ping Guo
Keyword(s):  
Curie Temperature ◽  
Structural Changes ◽  
Piezoelectric Properties ◽  
Relative Dielectric Constant ◽  
Piezoelectric Ceramics ◽  
X Ray Diffraction ◽  
Piezoelectric Strain ◽  
High Dielectric ◽  
Dielectric And Piezoelectric Properties ◽  
Piezoelectric Strain Constant

Piezoelectric ceramics with appropriate curie temperatures and high dielectric and piezoelectric performances are attractive for formations of ceramic/polymer piezoelectric composites. The PSZT ceramics with compositions of 0.98Pb1.0-xBaxTi0.48Zr0.52O3-0.02PbSbO3 (x=0.14~0.24) have been prepared by a conventional solid reaction process. The ceramic structures are analyzed by X-ray diffraction and the barium substitution leads to structural changes of the tetragonal and rhombohedral phases which constitute the perovskite PSZT ceramics, and lattice distortions. The curie temperature almost linearly decreases from 226 °C to 141 °C corresponding the barium content increases from 0.14 to 0.24 in the ceramics. The dielectric and piezoelectric properties are largely influenced by the barium substitution and when the barium content at vicinity of 0.22, the piezoelectric strain constant d33 exhibits a dramatic change. It is found that as the barium content around 0.22, the PSZT ceramic specimen is characterized with a low curie temperature Tc=156 °C, and satisfied dielectric and piezoelectric properties with the relative dielectric constant εr=5873, dielectric loss factor tanδ=0.0387, piezoelectric strain constant d33=578 pC/N.

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

1999 ◽  
Vol 600 ◽  
Author(s):  
J. Su ◽  
Z. Ounaies ◽  
J. S. Harrison
Keyword(s):  
Room Temperature ◽  
Remanent Polarization ◽  
Vinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Mechanical Stiffness ◽  
Blend Films ◽  
Relative Composition ◽  
Poly Vinylidene Fluoride ◽  
Piezoelectric Strain ◽  
Strain Coefficient

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.

The Effect of Particle Size on the Electromechanical Properties of PZT/PVDF

2009 ◽  
Vol 66 ◽  
pp. 238-241
Author(s):  
Xiao Fang Liu ◽  
Hua Jun Sun ◽  
Ming Wei ◽  
C.X. Xiong
Keyword(s):  
Particle Size ◽  
Piezoelectric Ceramic ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Volume Fraction ◽  
Relative Dielectric Constant ◽  
Connectivity Pattern ◽  
Conventional Solid State Reaction ◽  
Pressing Method ◽  
Dielectric And Piezoelectric Properties

The Nb modified PZT piezoelectric ceramic was synthesized by conventional solid-state reaction, where all of different particle sizes had the same physical properties. 0-3 modified PZT/PVDF composites were formed by hot-pressing method. The particle size effect of modified PZT on the relative dielectric and piezoelectric properties of the composites were investigated. The relative dielectric constant εr, piezoelectric constant d33 and electromechanical coupling factor kp were higher in the composite containing larger PZT particle size. The microstructures of the composites were studied by SEM, the composite with the finer PZT particle size was more homogeneous, but larger particle size was easy to be contacted. In a high volume fraction particle-loaded composite, some piezoelectric ceramic particle appeared to be in contact, as in a 1-3 connectivity pattern. The larger particle size of modified PZT itself could be seen as the grain of modified PZT contact in a 1-3 connectivity pattern and easy to be contacted each other compared to the finer particle size in the composites, thus reducing the resistance of the composites and the poling process became effective, which led to higher properties. The optimal particle size of PZT is about 100μm, the Nb modified PZT/PVDF (volume fraction 70/30) composite show higher dielectric and piezoelectric properties than the others, εr=156.6, d33=69pC/N and kp=0.358.

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

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.

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

Polymers ◽  
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.

Clamping effect on the piezoelectric properties of poly(vinylidene fluoride-trifluoroethylene) copolymer

1993 ◽  
Vol 150 (1) ◽  
pp. 255-266 ◽  
Author(s):  
H. Wang ◽  
Q. M. Zhang ◽  
L. E. Cross ◽  
A. O. Sykes
Keyword(s):  
Vinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Poly Vinylidene Fluoride

Surface Functionalization of a Poly(vinylidene fluoride): Effect on the Adhesive and Piezoelectric Properties

2009 ◽  
Vol 1 (12) ◽  
pp. 2902-2908 ◽  
Author(s):  
Ji Seok Lee ◽  
Gwang Ho Kim ◽  
Soon Man Hong ◽  
Hyoung Jin Choi ◽  
Yongsok Seo
Keyword(s):  
Surface Functionalization ◽  
Vinylidene Fluoride ◽  
Piezoelectric Properties ◽  
Poly Vinylidene Fluoride

PIEZOELECTRIC PROPERTIES OF CEMENT PIEZOELECTRIC COMPOSITES CONTAINING NANO-QUARTZ POWDERS

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Huang Hsing Pan ◽  
Wei-Ren Lin ◽  
Kuan Huang
Keyword(s):  
Health Monitoring ◽  
Electromechanical Coupling ◽  
Piezoelectric Properties ◽  
Relative Dielectric Constant ◽  
Cement Matrix ◽  
Electromechanical Coupling Coefficient ◽  
Cement Composites ◽  
Piezoelectric Composites ◽  
Structural Health ◽  
Piezoelectric Strain

In order to increase piezoelectric properties of 0-3 type cement piezoelectric composites (piezoelectric cement) developed for structural health monitoring, nano-quartz powders, as the replacement of cement matrix, were added into PZT/cement composites. The piezoelectric cement consists of 50% PZT and 50% cement by volume. Two gradations of PZT inclusions, single-grading and medium-grading, were chosen to fabricate the piezoelectric cement. Nano-quartz powders of 1% to 6% were added to form nano-quartz piezoelectric cement. Experimental results indicate that nano-quartz powders can reduce the porosity of piezoelectric cement. The single-grading piezoelectric cement (PSQ) with 4% nano-quartz powders and the medium-grading one (PMQ) with 2% have the lowest porosity. The maximum values on both piezoelectric strain factor d33 and relative dielectric constant εr always occur at the minimum porosity of nano-quartz piezoelectric cement. Both the PSQ and the PMQ have the optimum d33=104 pC/N. For the PSQ, 4% nano-quartz powders provide a 22% enhancement on thickness electromechanical coupling coefficient Kt. However, the effect of nano-quartz powders displays as less effective to the Kt of the PMQ due to non-uniform distribution of PZT particles. Nano-quartz piezoelectric cement has higher piezoelectric properties able to monitor and detect concrete structural health.

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