scholarly journals Enhanced piezoelectricity from highly polarizable oriented amorphous fractions in biaxially oriented poly(vinylidene fluoride) with pure β crystals

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yanfei Huang ◽  
Guanchun Rui ◽  
Qiong Li ◽  
Elshad Allahyarov ◽  
Ruipeng Li ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Theoretical Limit ◽  
Two Phase ◽  
Amorphous Fraction ◽  
Piezoelectric Polymers ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
Low Performance ◽  
Two Phases ◽  
Dynamics Simulations

AbstractPiezoelectric polymers hold great potential for various electromechanical applications, but only show low performance, with |d33 | < 30 pC/N. We prepare a highly piezoelectric polymer (d33 = −62 pC/N) based on a biaxially oriented poly(vinylidene fluoride) (BOPVDF, crystallinity = 0.52). After unidirectional poling, macroscopically aligned samples with pure β crystals are achieved, which show a high spontaneous polarization (Ps) of 140 mC/m2. Given the theoretical limit of Ps,β = 188 mC/m2 for the neat β crystal, the high Ps cannot be explained by the crystalline-amorphous two-phase model (i.e., Ps,β = 270 mC/m2). Instead, we deduce that a significant amount (at least 0.25) of an oriented amorphous fraction (OAF) must be present between these two phases. Experimental data suggest that the mobile OAF resulted in the negative and high d33 for the poled BOPVDF. The plausibility of this conclusion is supported by molecular dynamics simulations.

scholarly journals Enhanced Piezoelectricity from Highly Polarizable Oriented Amorphous Fractions in Biaxially Oriented Poly(vinylidene fluoride) with Pure β Crystals

2020 ◽  
Author(s):  
yanfei Huang ◽  
Guanchun Rui ◽  
Elshad Allahyarov ◽  
Ruipeng Li ◽  
Masafumi Fukuto ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Theoretical Limit ◽  
Two Phase ◽  
Amorphous Phases ◽  
Piezoelectric Polymers ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
Low Performance ◽  
Two Phases ◽  
Dynamics Simulations

Abstract Piezoelectric polymers hold great potential for various electromechanical applications, but only show low performance, with |d33| < 30 pC/N. We prepared a highly piezoelectric polymer (d33 = -62 pC/N) based on a biaxially oriented poly(vinylidene fluoride) (BOPVDF, crystallinity = 0.52). After unidirectional poling, macroscopically aligned samples with pure β crystals were achieved, which showed an unprecedentedly high spontaneous polarization (Ps) of 140 mC/m2. Given the theoretical limit of Ps = 188 mC/m2 for the neat b crystal, the high Ps could not be explained by a simple two-phase model (i.e., the crystalline and the amorphous phases). Instead, we deduce that a significant amount (at least 0.25) of an oriented amorphous fraction (OAF) must be present between these two phases. Experimental data suggest that the mobile OAF resulted in the negative and high d33 for the poled BOPVDF. The plausibility of this conclusion was supported by molecular dynamics simulations.

scholarly journals Giant spontaneous polarization for enhanced ferroelectric properties of biaxially oriented poly(vinylidene fluoride) by mobile oriented amorphous fractions

2021 ◽  
Author(s):  
Guanchun Rui ◽  
Yanfei Huang ◽  
Xinyue Chen ◽  
Ruipeng Li ◽  
Dingrui Wang ◽  
...  
Keyword(s):  
Spontaneous Polarization ◽  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Amorphous Fraction ◽  
Poly Vinylidene Fluoride

Oriented amorphous fraction in biaxially oriented poly(vinylidene fluoride) gives it significantly enhanced dielectric and ferroelectric properties.

Temperature Response of Magnetostrictive/Piezoelectric Polymer Magnetoelectric Laminates

2012 ◽  
Vol 1398 ◽  
Author(s):  
Jon Gutiérrez ◽  
Andoni Lasheras ◽  
Jose Manuel Barandiarán ◽  
Jose Luis Vilas ◽  
María San Sebastián ◽  
...  
Keyword(s):  
High Temperature ◽  
Room Temperature ◽  
Vinylidene Fluoride ◽  
Temperature Response ◽  
Laminated Composite ◽  
Laminate Composites ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
New Type ◽  
Magnetoelectric Response

ABSTRACTThe temperature effect on the magnetoelectric response of hybrid magnetostrictive/piezoelectric laminated composites in the range from room temperature up to 85 ºC is presented. The samples analyzed consisted of alternating, stacked, layers of a magnetostrictive amorphous metal, and a piezoelectric polymer, bonded to each other with an epoxy. The maximum magnetoelectric effect was observed when the composites were driven at their electromechanical resonance. First, we present results on the fabricability of the laminated composite sensor consisting on Vitrovac 4040® (Fe39Ni39Mo4Si6B12) as the magnetostrictive amorphous component and two different piezoelectric polymers: poly(vinylidene fluoride) (PVDF) and 2,6(β-CN)APB/ODPA (poli 2,6) polyimide, a new type of high temperature piezoelectric polymer. At room temperature induced magnetoelectric voltages of 79.6 and 0.35 V/cm.Oe were measured when using PVDF and poli 2,6 polyimide respectively as the piezoelectric components. When heating, we have observed that the magnetoelectric response of the PVDF-containing device quickly decayed to about 5 V/cm.Oe, while for the poli 2,6- containing one it remained almost constat. We discuss the advantage of using this new piezoelectric polymer due to its good performance at high temperatures, making these magnetoelectric laminate composites suitable for high temperature applications.

Self-powered graphene quantum dot/poly(vinylidene fluoride) composites with remarkably enhanced mechanical-to-electrical conversion

RSC Advances ◽  
2016 ◽  
Vol 6 (71) ◽  
pp. 67400-67408 ◽  
Author(s):  
Chong Lu ◽  
Lei Zhang ◽  
Chenwen Xu ◽  
Zhenzhong Yin ◽  
Shaobing Zhou ◽  
...  
Keyword(s):  
Quantum Dot ◽  
Matrix Composite ◽  
Polymer Matrix ◽  
Vinylidene Fluoride ◽  
Polymer Matrix Composite ◽  
Graphene Quantum Dot ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
Self Powered

A self-powered piezoelectric polymer matrix composite, with remarkably enhanced mechanical-to-electrical conversion, was fabricated without any treatment of electrical poling.

Novel Carbon Nanotube Reinforced Electro-Active Polymer Sensors for Structural Vibration Control

2004 ◽  
Author(s):  
Arun Ramaratnam ◽  
Nader Jalili
Keyword(s):  
Carbon Nanotubes ◽  
Vibration Control ◽  
Vinylidene Fluoride ◽  
Low Cost ◽  
Active Vibration Control ◽  
Structural Vibration ◽  
Piezoelectric Polymers ◽  
Polymer Sensors ◽  
Poly Vinylidene Fluoride ◽  
Damping Materials

Electro-active polymers like poly(vinylidene fluoride) — PVDF and their copolymers, have been emerging as a low cost substitutes for piezoelectric ceramics. Carbon nanotubes with their excellent physical and electronic properties can be used in these electro-active polymers to enhance their actuation and sensing properties. In the work presented here, actuators and sensors have been fabricated using piezoelectric polymers reinforced with carbon nanotubes. Single-walled and multi-walled nanotubes are used to reinforce the piezoelectric polymers. The response of these actuators and sensors are measured and the influence of the fabrication methods on the sensor performance is determined. The use of these materials as actuators and sensors to implement active vibration control is studied. These transducers also serve as additional damping materials added to the structure undergoing vibration due to their viscous damping properties. The change in properties of these piezoelectric polymers with different fabrication conditions and nanotube addition, though provokes doubts about standardization, invokes more research efforts on these new generation transducers.

Bi2S3/poly(vinylidene fluoride) composite with high dielectric constant and unusual low dielectric loss based on preferentially oriented fillers

RSC Advances ◽  
2015 ◽  
Vol 5 (117) ◽  
pp. 96258-96264 ◽  
Author(s):  
Jie Liu ◽  
Yu Luo ◽  
Yao Wang ◽  
Yuan Deng ◽  
Xitong Xie
Keyword(s):  
Dielectric Constant ◽  
Dielectric Loss ◽  
Hot Pressing ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Bismuth Sulfide ◽  
Two Phase ◽  
Low Dielectric ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

In this work, a novel two-phase ferroelectric polymer composite, consisting of semiconducting bismuth sulfide nanorods and a poly(vinylidene fluoride) matrix, was fabricated by a sequence of casting, hot-stretching and hot-pressing techniques.

Piezoelectric Polymer Transducers

1987 ◽  
Vol 1 (1) ◽  
pp. 45-49 ◽  
Author(s):  
G.T. Davis
Keyword(s):  
Vinylidene Fluoride ◽  
Effective Means ◽  
Protective Layer ◽  
Pressure Transducers ◽  
Flexible Polymer ◽  
Piezoelectric Polymer ◽  
Poly Vinylidene Fluoride ◽  
Sharp Edges ◽  
Repeated Use ◽  
Film Transducer

Poly(vinylidene fluoride) (CH2-CF2)n is a tough, flexible polymer readily available in the form of thin film which can be made piezoelectric by the temporary application of a high electric field. The areas of the film which become piezoelectric can be controlled to be the areas where metal electrodes are evaporated onto the film. The same electrodes and associated leads are subsequently used to detect the electric charge generated by the application of pressure to the active area. Such films may have applications in the measurement of occlusal forces. Many of the problems that might be encountered in an occlusal gauge have been addressed separately in other applications. For example, polymer transducers less than 100 μm thick have been developed and tested for measuring the nip pressure on an intaglio printing press. Piezoelectric polymer gauges have been successfully encased in a protective layer of another polymer to prevent the sharp edges of sand particles from breaking through the piezoelectric film. Transducer films with an array of active areas have been produced with electrical leads from each area so that the source of the signal can be traced. Electrode patterns have usually been established by evaporation of metal through a mask, but silk-screening a conductive ink has also been shown to be an effective means of defining which areas of the film are to be made piezoelectric. Finally, poly(vinylidene fluoride) has been shown to retain 80% of its initial activity after 1000 hours at 100°C, and it is unaffected by moisture. Therefore, if necessary, gauges to be used in dentistry could be subjected to steam sterilization for repeated use. The physical properties of such polymer films and examples of their use in pressure transducers are reviewed with the intent of stimulating interest in development of a system useful for measuring occlusal forces.

Sign in / Sign up

Export Citation Format

Share Document