Toroidal polar topology in strained ferroelectric polymer

Science ◽  
2021 ◽  
Vol 371 (6533) ◽  
pp. 1050-1056 ◽  
Author(s):  
Mengfan Guo ◽  
Changqing Guo ◽  
Jian Han ◽  
Shulin Chen ◽  
Shan He ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Vinylidene Fluoride ◽  
Far Infrared ◽  
Terahertz Wave ◽  
Research Field ◽  
Polymer Chains ◽  
Relaxor Behavior ◽  
Ferroelectric Polymer ◽  
Continuous Rotation ◽  
Ferroic Materials

Polar topological texture has become an emerging research field for exotic phenomena and potential applications in reconfigurable electronic devices. We report toroidal topological texture self-organized in a ferroelectric polymer, poly(vinylidene fluoride-ran-trifluoroethylene) [P(VDF-TrFE)], that exhibits concentric topology with anticoupled chiral domains. The interplay among the elastic, electric, and gradient energies results in continuous rotation and toroidal assembly of the polarization perpendicular to polymer chains, whereas relaxor behavior is induced along polymer chains. Such toroidal polar topology gives rise to periodic absorption of polarized far-infrared (FIR) waves, enabling the manipulation of the terahertz wave on a mesoscopic scale. Our observations should inform design principles for flexible ferroic materials toward complex topologies and provide opportunities for multistimuli conversions in flexible electronics.

Molecular modeling of the piezoelectric effect in the ferroelectric polymer poly(vinylidene fluoride) (PVDF)

2013 ◽  
Vol 19 (9) ◽  
pp. 3591-3602 ◽  
Author(s):  
Vladimir S. Bystrov ◽  
Ekaterina V. Paramonova ◽  
Igor K. Bdikin ◽  
Anna V. Bystrova ◽  
Robert C. Pullar ◽  
...  
Keyword(s):  
Molecular Modeling ◽  
Vinylidene Fluoride ◽  
Piezoelectric Effect ◽  
Ferroelectric Polymer ◽  
Poly Vinylidene Fluoride

Simulations of High-Strain Electrostrictive Chlorinated Terpolymers

2003 ◽  
Vol 785 ◽  
Author(s):  
George J. Kavarnos ◽  
Thomas Ramotowski
Keyword(s):  
Vinylidene Fluoride ◽  
High Strain ◽  
Polymer Chains ◽  
X Ray Diffraction ◽  
X Ray ◽  
Lamellar Structures ◽  
Annealing Conditions ◽  
Poly Vinylidene Fluoride ◽  
Electromechanical Responses ◽  
Kinetics Of

ABSTRACTChlorinated poly(vinylidene fluoride/trifluoroethylene) terpolymers are remarkable examples of high strain electrostrictive materials. These polymers are synthesized by copolymerizing vinylidene fluoride and trifluoroethylene with small levels of a third chlorinated monomer. The electromechanical responses of these materials are believed to originate from the chlorine atom, which, by its presence in the polymer chains and by virtue of its large van der Waals radius, destroys the long-range crystalline polar macro-domains and transforms the polymer from a normal to a high-strain relaxor ferroelectric. To exploit the strain properties of the terpolymer, it is desirable to understand the structural implications resulting from the presence of the chlorinated monomer. To this end, computations have been performed on model superlattices of terpolymers using quantum-mechanical based force fields. The focus has been on determining the energetics and kinetics of crystallization of the various polymorphs that have been identified by x-ray diffraction and fourier transform infrared spectroscopy. The chlorinated monomer is shown to act as a defect that can be incorporated into the lamellar structures of annealed terpolymer without a high cost in energy. The degree of incorporation of the chlorinated monomer into the crystal lattice is controlled by annealing conditions and ultimately determines the ferroelectric behavior of the terpolymers.

Organic/Inorganic Hybrid-Type Nonvolatile Memory Thin-Film Transistor on Plastic Substrate below 150°C

2011 ◽  
Vol 1287 ◽  
Author(s):  
Sung-Min Yoon ◽  
Shinhyuk Yang ◽  
Soon-Won Jung ◽  
Sang-Hee Ko Park ◽  
Chun-Won Byun ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Nonvolatile Memory ◽  
Vinylidene Fluoride ◽  
Thin Film Transistor ◽  
Memory Device ◽  
Gate Insulator ◽  
Oxide Semiconductor ◽  
Plastic Substrate ◽  
Inorganic Hybrid ◽  
Hybrid Type

ABSTRACTAn organic/inorganic hybrid-type nonvolatile memory TFT was proposed as a core device for the future flexible electronics. The structural feature of this memory TFT was that a ferroelectric copolymer and an oxide semiconductor layers were employed as a gate insulator and an active channel, respectively. The memory TFT with the structure of Au/poly(vinylidene fluoride-trifluoroethylene)/Al2O3/ZnO/Ti/Au/Ti/poly(ethylene naphthalate) could be successfully fabricated at the process temperature of below 150°C. It was confirmed that the TFT well operated as a memory device even under the bending situations.

Imperceptible Energy Harvesting Device and Biomedical Sensor based on Ultraflexible Ferroelectric Transducers and Organic Diodes

2020 ◽  
Author(s):  
Andreas Petritz ◽  
Esther Karner-Petritz ◽  
T. Uemura ◽  
Philipp Schäffner ◽  
Teppei Araki ◽  
...  
Keyword(s):  
Energy Harvesting ◽  
Flexible Electronics ◽  
Mechanical Stability ◽  
Blood Pressure Monitoring ◽  
Fast Response ◽  
Essential Elements ◽  
Ferroelectric Polymer ◽  
Organic Diodes ◽  
Harvesting Systems ◽  
First Time

Abstract Energy autonomy and conformability are essential elements in the next generation of wearable and flexible electronics for healthcare, robotics and cyber-physical systems. This study presents ferroelectric polymer transducers and organic diodes for imperceptible sensing and energy harvesting systems, which, for the first time, are integrated on ultrathin (1-µm) substrates, thus imparting them with unprecedented flexibility. Simulations show that the sensitivity of ultraflexible ferroelectric polymer transducers (UFPTs) is enhanced dramatically using an ultrathin substrate, which allows the mounting on 3D-shaped objects and the stacking in multiple layers. Indeed, UFPTs have superior sensitivity to strain and pressure, fast response and excellent mechanical stability, thus forming imperceptible wireless e-health patches for precise pulse and blood pressure monitoring. For harvesting biomechanical energy, UFPTs are combined with rectifiers based on the world’s first ultraflexible organic diodes thus comprising an imperceptible, 2.5 µm thin, energy harvesting device with an excellent peak power density of 3 mW⋅cm− 3.

scholarly journals Ferroelectric polymer scaffolds based on a copolymer of tetrafluoroethylene with vinylidene fluoride: Fabrication and properties

2014 ◽  
Vol 40 ◽  
pp. 32-41 ◽  
Author(s):  
E.N. Bolbasov ◽  
Y.G. Anissimov ◽  
A.V. Pustovoytov ◽  
I.A. Khlusov ◽  
A.A. Zaitsev ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Polymer Scaffolds ◽  
Ferroelectric Polymer

Preparation, Morphology and Dielectric Properties of Polyamide-6/Poly(Vinylidene Fluoride) Blends

2012 ◽  
Vol 496 ◽  
pp. 263-267
Author(s):  
Rui Li ◽  
Jian Zhong Pei ◽  
Yan Wei Li ◽  
Xin Shi ◽  
Qun Le Du
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Flexible Electronics ◽  
High Dielectric Constant ◽  
Vinylidene Fluoride ◽  
Volume Fraction ◽  
Polyamide 6 ◽  
Dielectric Constants ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

A novel all-polymeric material with high dielectric constant (k) has been developed by blending poly (vinylidene fluoride) (PVDF) with polyamide-6 (PA6). The dependence of the dielectric properties on frequency and polymer volume fraction was investigated. When the volume fraction of PA6 is 20%, the dielectric property is better than others. The SEM investigations suggest that the enhanced dielectric behavior originates from significant interfacial interactions of polymer-polymer. The XRD demonstrate that the PA6 and PVDF affect the crystalline behavior of each component. Furthermore, the stable dielectric constants of the blends could be tuned by adjusting the content of the polymers. The created high-k all-polymeric blends represent a novel type of material that are simple technology and easy to process, and is of relatively high dielectric constant, applications as flexible electronics.

scholarly journals Embedded Enzyme Nanoclusters Depolymerize Polyesters via Chain-End Mediated Processive Degradation

2020 ◽  
Author(s):  
Christopher DelRe ◽  
Junpyo Kwon ◽  
Philjun Kang ◽  
Le Ma ◽  
Aaron Hall ◽  
...  
Keyword(s):  
Flexible Electronics ◽  
Building Blocks ◽  
Polymer Chains ◽  
Poly Lactic Acid ◽  
Polymer Conformation ◽  
Material Development ◽  
Metal Filler ◽  
Segmental Dynamic ◽  
And Function ◽  
Poly Caprolactone

AbstractMany bioactive elements, long perceived as non-viable for material development, are now emerging as viable building blocks to encode material lifecycle and to ensure our harmonious existence with nature. Yet, there is a significant knowledge gap on how bio-elements interface with synthetic counterparts and function outside of their native environments. Here, we show that when enzymes are dispersed as nanoclusters confined within macromolecular matrices, their reaction kinetics, pathway, and substrate selectivity can be modulated to achieve programmable polymer degradation down to repolymerizable small molecules. Specifically, when enzyme nanoclusters are dispersed in trace amount (~0.02 wt%) in polyesters, i.e. poly(caprolactone) (PCL) and poly(lactic acid) (PLA), chain-end mediated processive depolymerization can be realized, leading to scalable bioactive plastics for efficient sorting, such as recovery of precious metal filler from flexible electronics. Present studies demonstrate that when the enzyme is confined at dimensions similar to that of polymer chains, their behaviors are governed by the polymer conformation, segmental dynamic and thermal history, highlighting the importance to consider bioactive plastics differently from solution enzymology.

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