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

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.

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.

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

Membranes ◽  
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.

Preparation and electrical properties of γ form poly(vinylidene fluoride) thin film by vapour deposition in the presence of an electric field

1991 ◽  
Vol 202 (2) ◽  
pp. 213-220 ◽  
Author(s):  
Akiyoshi Takeno ◽  
Norimasa Okui ◽  
Tetsuji Kitoh ◽  
Michiharu Muraoka ◽  
Susumu Umemoto ◽  
...  
Keyword(s):  
Thin Film ◽  
Electrical Properties ◽  
Electric Field ◽  
Vapour Deposition ◽  
Vinylidene Fluoride ◽  
Poly Vinylidene Fluoride

Preparation and Characterization of Modified PVDF-g-PSSA Membrane

2010 ◽  
Vol 152-153 ◽  
pp. 44-50 ◽  
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.

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