Influence of the processing parameters on the electrocaloric effect of poly(vinylidene fluoride-trifluoroethylene) copolymers

2016 ◽  
Vol 134 (5) ◽  
Author(s):  
Yongtao Yao ◽  
Guanghua Hou ◽  
Nannan Li ◽  
Tianyang Zhou ◽  
Liwu Liu ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Processing Parameters ◽  
Electrocaloric Effect ◽  
Poly Vinylidene Fluoride

scholarly journals A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

Polymers ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1160 ◽  
Author(s):  
XueMei Tan ◽  
Denis Rodrigue
Keyword(s):  
Phase Separation ◽  
Vinylidene Fluoride ◽  
Solvent System ◽  
Processing Parameters ◽  
Membrane Preparation ◽  
Polymeric Membrane ◽  
Ambient Conditions ◽  
Membrane Fabrication ◽  
Core Technology ◽  
Poly Vinylidene Fluoride

Porous polymeric membranes have emerged as the core technology in the field of separation. But some challenges remain for several methods used for membrane fabrication, suggesting the need for a critical review of the literature. We present here an overview on porous polymeric membrane preparation and characterization for two commonly used polymers: polysulfone and poly (vinylidene fluoride). Five different methods for membrane fabrication are introduced: non-solvent induced phase separation, vapor-induced phase separation, electrospinning, track etching and sintering. The key factors of each method are discussed, including the solvent and non-solvent system type and composition, the polymer solution composition and concentration, the processing parameters, and the ambient conditions. To evaluate these methods, a brief description on membrane characterization is given related to morphology and performance. One objective of this review is to present the basics for selecting an appropriate method and membrane fabrication systems with appropriate processing conditions to produce membranes with the desired morphology, performance and stability, as well as to select the best methods to determine these properties.

scholarly journals Structure–Properties Relationship of Electrospun PVDF Fibers

Nanomaterials ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 1221 ◽  
Author(s):  
Klara Castkova ◽  
Jaroslav Kastyl ◽  
Dinara Sobola ◽  
Josef Petrus ◽  
Eva Stastna ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Longitudinal Direction ◽  
Processing Parameters ◽  
Electrospinning Process ◽  
Physical Parameters ◽  
Hexadecyltrimethylammonium Bromide ◽  
Piezoelectric Activity ◽  
Poly Vinylidene Fluoride ◽  
Versatile Technique ◽  
Relationship Of

Electrospinning as a versatile technique producing nanofibers was employed to study the influence of the processing parameters and chemical and physical parameters of solutions on poly(vinylidene fluoride) (PVDF) fibers’ morphology, crystallinity, phase composition and dielectric and piezoelectric characteristics. PVDF fibrous layers with nano- and micro-sized fiber diameters were prepared by a controlled and reliable electrospinning process. The fibers with diameters from 276 nm to 1392 nm were spun at a voltage of 25 kV–50 kV from the pure PVDF solutions or in the presence of a surfactant—Hexadecyltrimethylammonium bromide (CTAB). Although the presence of the CTAB decreased the fibers’ diameter and increased the electroactive phase content, the piezoelectric performance of the PVDF material was evidently deteriorated. The maximum piezoelectric activity was achieved in the fibrous PVDF material without the use of the surfactant, when a piezoelectric charge of 33 pC N−1 was measured in the transversal direction on a mean fiber diameter of 649 nm. In this direction, the material showed a higher piezoelectric activity than in the longitudinal direction.

Enhanced ferroelectric properties of electrospun poly(vinylidene fluoride) nanofibers by adjusting processing parameters

RSC Advances ◽  
2015 ◽  
Vol 5 (75) ◽  
pp. 61277-61283 ◽  
Author(s):  
Mohammad Mahdi Abolhasani ◽  
Sara Azimi ◽  
Hossein Fashandi
Keyword(s):  
Vinylidene Fluoride ◽  
Ferroelectric Properties ◽  
Processing Parameters ◽  
Poly Vinylidene Fluoride

This contribution investigates the ferroelectric properties and polymorphism evolution of poly(vinylidene fluoride) (PVDF) mats prepared through electrospinning solutions of PVDF in pure N,N-dimethylformamide (DMF) and DMF/acetone mixtures with different weight ratios.

scholarly journals Process Optimization of PVDF Piezoelectric Nanofiber Production via Electrospinning

2021 ◽  
Vol 13 (1) ◽  
pp. 1-13
Author(s):  
Attila Levente Gergely ◽  
József Kántor
Keyword(s):  
Experimental Design ◽  
Process Optimization ◽  
Process Parameters ◽  
Flow Rate ◽  
Significant Influence ◽  
Vinylidene Fluoride ◽  
Fiber Diameter ◽  
Processing Parameters ◽  
Electrospinning Method ◽  
Poly Vinylidene Fluoride

Abstract The aim of this work was to investigate the effect of processing parameters of the electrospinning method on the resulting poly (vinylidene fluoride) (PVDF) fiber diameter. A three factorial Box-Behnken experimental design was employed to study the influence of applied voltage, the capillary-to-collector distance and the applied flow rate on the resulting fiber diameter. We successfully prepared bead-free PVDF nanofibers with fiber diameters ranging from 510-1300 nm. The experimental design analysis did not show significant influence of the studied process parameters under the used boundary conditions on the fiber diameter, thus indicating the robustness of the process.

Enhanced Electrocaloric Effect in Poly(vinylidene fluoride-trifluoroethylene)-based Composites

2013 ◽  
Vol 1490 ◽  
pp. 235-240
Author(s):  
Xiang-Zhong Chen ◽  
Xiao-Shi Qian ◽  
Xinyu Li ◽  
David Sheng-Guo Lu ◽  
Haiming Gu ◽  
...  
Keyword(s):  
Polymer Blends ◽  
Vinylidene Fluoride ◽  
Inorganic Nanoparticles ◽  
Relaxor Behavior ◽  
Electrocaloric Effect ◽  
Ferroelectric Relaxor ◽  
Poly Vinylidene Fluoride

ABSTRACTThe poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE)) based ferroelectric and relaxor materials have been proved to be good electrocaloric (EC) materials. To further enhance the EC effect in ferroelectric relaxor terpolymer poly(vinylidene fluoride–trifluoroethylene-chlorofluoroethylene) (P(VDF-TrFE-CFE)), composites such as polymer-polymer blends and nanocomposites filled with inorganic nanoparticles are fabricated and investigated. It is found that the addition of small amount of filler (such as P(VDF-TrFE) or nano-ZrO2) can increase terpolymer’s crystallinity and enhance its relaxor behavior through interface couplings. The increased crystallinity and enhanced relaxor behavior together result in enhanced electrocaloric effect. The results demonstrate the promise of composite approaches in tailoring and enhancing ECE in the relaxor terpolymers.

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