A mixed solvent approach to make poly(vinylidene fluoride) nanofibers with high β-phase using solution blow spinning

2020 ◽  
Vol 32 (10) ◽  
pp. 1160-1168
Author(s):  
Qing Su ◽  
Zhenggen Jiang ◽  
Bo Li
Keyword(s):  
Vinylidene Fluoride ◽  
Average Diameter ◽  
Solution Viscosity ◽  
Β Phase ◽  
Infrared Reflection ◽  
Poly Vinylidene Fluoride ◽  
High Fraction ◽  
Solution Blow Spinning ◽  
The Relationship ◽  
Methodological Studies

The excellent mechanical and piezoelectric properties of poly(vinylidene fluoride) (PVDF) are its most valuable characteristics, and improving the piezoelectric performance of PVDF is an important subject of the study. However, several existing methodological studies have been regarded as complex and ineffective. The most efficient method to produce PVDF nanofibers with high β-phase contents is still electrospinning; however, this process does not facilitate the mass production of PVDF nanofibers and produces PVDF with a relatively low fraction of β-phase. Both these issues can be solved by solution blow spinning (SBS). This work focused on the optimum ratio of solvents to produce beadless PVDF nanofibers and highlighted the relationship between the spinning solution viscosity and the average diameter of the SBS nanofibers obtained. Using Fourier transform infrared reflection, it was evaluated that the fraction of the β-phase increased after the SBS process, which was calculated to be 85%; this value was considered as a relatively high fraction of β-phase, which was similar to that obtained by electrospinning. Consequently, a simple and convenient alternative to produce PVDF nanofibers with high β-phase contents was achieved.

scholarly journals Fabrication and Characterisation of Stimuli Responsive Piezoelectric PVDF and Hydroxyapatite-Filled PVDF Fibrous Membranes

Molecules ◽  
2019 ◽  
Vol 24 (10) ◽  
pp. 1903 ◽  
Author(s):  
Biranche Tandon ◽  
Prashant Kamble ◽  
Richard T. Olsson ◽  
Jonny J. Blaker ◽  
Sarah H. Cartmell
Keyword(s):  
Tissue Engineering ◽  
Cellular Response ◽  
Vinylidene Fluoride ◽  
Fibre Diameter ◽  
Fibre Production ◽  
Stimuli Responsive ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Solution Blow Spinning ◽  
Fibrous Membranes

Poly(vinylidene fluoride) has attracted interest from the biomaterials community owing to its stimuli responsive piezoelectric property and promising results for application in the field of tissue engineering. Here, solution blow spinning and electrospinning were employed to fabricate PVDF fibres and the variation in resultant fibre properties assessed. The proportion of piezoelectric β-phase in the solution blow spun fibres was higher than electrospun fibres. Fibre production rate was circa three times higher for solution blow spinning compared to electrospinning for the conditions explored. However, the solution blow spinning method resulted in higher fibre variability between fabricated batches. Fibrous membranes are capable of generating different cellular response depending on fibre diameter. For this reason, electrospun fibres with micron and sub-micron diameters were fabricated, along with successful inclusion of hydroxyapatite particles to fabricate stimuli responsive bioactive fibres.

Morphological Analysis of Nanostructured PVDF β-Phase Films Obtained by Solution Blow Spinning

2021 ◽  
Vol 41 ◽  
pp. 1-10
Author(s):  
Gabriel C. Dias ◽  
Lincon Zadorosny ◽  
Alex O. Sanches ◽  
Mirian C. Santos ◽  
Luiz F. Malmonge
Keyword(s):  
Contact Angle ◽  
Tensile Strength ◽  
Thermogravimetric Analysis ◽  
Hot Pressing ◽  
Morphological Analysis ◽  
Vinylidene Fluoride ◽  
X Ray ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Solution Blow Spinning

This work aimed to compare the characteristics of micro and nanofibers of the poly (vinylidene fluoride) - PVDF polymer obtained by the Solution Blow Spinning (SBS) method, and films with those produced by other techniques, such as: casting and hot pressing. Thermogravimetric analysis (TGA) revealed that the films are thermally stable up to a temperature of 420 ° C. X-ray diffractometry (XRD) indicated the presence of the crystalline phases α and β, the β phase being more evident for nanofibers and PVDF casting. The film obtained by SBS showed a greater contact angle, showing to be more hydrophobic. Strain tests showed that the nanofiber films showed a 72% rupture to rupture, about 1.7 and 3.1 times greater than those obtained by casting and hot pressing, respectively. There was also a decrease in the modulus of elasticity and the limit of tensile strength of nanofibers, compared to other films.

High Efficient and Continuous Triboelectric Power Harvesting based on Porous β-phase Poly (vinylidene fluoride) Aerogel

2021 ◽  
Author(s):  
Minmin Wang ◽  
Weiqun Liu ◽  
Xu Shi ◽  
Jinyang Pan ◽  
Bing Zhou ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
High Electron ◽  
Exchange Method ◽  
Power Harvesting ◽  
Β Phase ◽  
Output Performance ◽  
High Electron Affinity ◽  
High Efficient ◽  
Poly Vinylidene Fluoride ◽  
High Output

Non-additive β-phase porous poly (vinylidene fluoride) (PVDF) aerogel with high electron affinity is successfully prepared through simple solvent exchange method. The as-prepared additive-free PVDF aerogel shows high output performance used...

scholarly journals Comparative Study of PVDF Sheets and Their Sensitivity to Mechanical Vibrations: The Role of Dimensions, Molecular Weight, Stretching and Poling

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1637
Author(s):  
Miroslav Mrlík ◽  
Josef Osička ◽  
Martin Cvek ◽  
Markéta Ilčíková ◽  
Peter Srnec ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Comparative Study ◽  
Vinylidene Fluoride ◽  
Initial Thickness ◽  
Complementary Method ◽  
Β Phase ◽  
Vibration Sensing ◽  
Poly Vinylidene Fluoride ◽  
Processing Techniques ◽  
The Comparative Study

This paper is focused on the comparative study of the vibration sensing capabilities of poly(vinylidene fluoride) (PVDF) sheets. The main parameters such as molecular weight, initial sample thickness, stretching and poling were systematically applied, and their impact on sensing behavior was examined. The mechanical properties of prepared sheets were investigated via tensile testing on the samples with various initial thicknesses. The transformation of the α-phase to the electro-active β-phase was analyzed using FTIR after applying stretching and poling procedures as crucial post-processing techniques. As a complementary method, the XRD was applied, and it confirmed the crystallinity data resulting from the FTIR analysis. The highest degree of phase transformation was found in the PVDF sheet with a moderate molecular weight (Mw of 275 kDa) after being subjected to the highest axial elongation (500%); in this case, the β-phase content reached approximately 90%. Finally, the vibration sensing capability was systematically determined, and all the mentioned processing/molecular parameters were taken into consideration. The whole range of the elongations (from 50 to 500%) applied on the PVDF sheets with an Mw of 180 and 275 kDa and an initial thickness of 0.5 mm appeared to be sufficient for vibration sensing purposes, showing a d33 piezoelectric charge coefficient from 7 pC N−1 to 9.9 pC N−1. In terms of the d33, the PVDF sheets were suitable regardless of their Mw only after applying the elongation of 500%. Among all the investigated samples, those with an initial thickness of 1.0 mm did not seem to be suitable for vibration sensing purposes.

scholarly journals Studies on the electrostatic effects of stretched PVDF films and nanofibers

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Yixuan Lin ◽  
Yuqiong Zhang ◽  
Fan Zhang ◽  
Meining Zhang ◽  
Dalong Li ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Polarized Light ◽  
Transition Process ◽  
Open Circuit ◽  
Wearable Electronics ◽  
Energy Harvesters ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Piezoelectric Effects ◽  
Energy Harvesting Devices

AbstractThe electroactive β-phase in Poly (vinylidene fluoride, PVDF) is the most desirable conformation due to its highest pyro- and piezoelectric properties, which make it feasible to be used as flexible sensors, wearable electronics, and energy harvesters etc. In this study, we successfully developed a method to obtain high-content β-phase PVDF films and nanofiber meshes by mechanical stretching and electric spinning. The phase transition process and pyro- and piezoelectric effects of stretched films and nanofiber meshes were characterized by monitoring the polarized light microscopy (PLM) images, outputting currents and open-circuit voltages respectively, which were proved to be closely related to stretching ratio (λ) and concentrations. This study could expand a new route for the easy fabrication and wide application of PVDF films or fibers in wearable electronics, sensors, and energy harvesting devices.

Understanding nucleation of the electroactive β-phase of poly(vinylidene fluoride) by nanostructures

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 113007-113015 ◽  
Author(s):  
M. S. Sebastian ◽  
A. Larrea ◽  
R. Gonçalves ◽  
T. Alejo ◽  
J. L. Vilas ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Β Phase ◽  
Poly Vinylidene Fluoride

scholarly journals Fabrication of Poly(Vinylidene Fluoride)/Graphene Nano-Composite Micro-Parts with Increased β-Phase and Enhanced Toughness via Micro-Injection Molding

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3292
Author(s):  
Wu Guo ◽  
Zhaogang Liu ◽  
Yan Zhu ◽  
Li Li
Keyword(s):  
Injection Molding ◽  
Vinylidene Fluoride ◽  
Structure Evolution ◽  
Phase Content ◽  
Micro Injection Molding ◽  
Nano Composite ◽  
Injection Speed ◽  
Β Phase ◽  
Poly Vinylidene Fluoride ◽  
Micro Parts

Based on poly(vinylidene fluoride)/graphene (PVDF/GP) nano-composite powder, with high β-phase content (>90%), prepared on our self-designed pan-mill mechanochemical reactor, the micro-injection molding of PVDF/GP composite was successfully realized and micro-parts with good replication and dimensional stability were achieved. The filling behaviors and the structure evolution of the composite during the extremely narrow channel of the micro-injection molding were systematically studied. In contrast to conventional injection molding, the extremely high injection speed and small cavity of micro-injection molding produced a high shear force and cooling rate, leading to the obvious “skin-core” structure of the micro-parts and the orientation of both PVDF and GP in the shear layer, thus, endowing the micro-parts with a higher melting point and crystallinity and also inducing the transformation of more α-phase PVDF to β-phase. At the injection speed of 500 mm/s, the β-phase PVDF in the micro-part was 78%, almost two times of that in the macro-part, which was beneficial to improve the dielectric properties. The micro-part had the higher tensile strength (57.6 MPa) and elongation at break (53.6%) than those of the macro-part, due to its increased crystallinity and β-phase content.

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