Silica nanoparticles surface charge modulation of the electroactive phase content and physical-chemical properties of poly(vinylidene fluoride) nanocomposites

2020 ◽  
Vol 185 ◽  
pp. 107786 ◽  
Author(s):  
Sylvie Ribeiro ◽  
Rafaela M. Meira ◽  
Daniela M. Correia ◽  
Carmen R. Tubio ◽  
Clarisse Ribeiro ◽  
...  
Keyword(s):  
Surface Charge ◽  
Silica Nanoparticles ◽  
Vinylidene Fluoride ◽  
Chemical Properties ◽  
Phase Content ◽  
Physical Chemical ◽  
Poly Vinylidene Fluoride ◽  
Charge Modulation

Nanoparticle Size and Concentration Dependence of the Electroactive Phase Content and Electrical and Optical Properties of Ag/Poly(vinylidene fluoride) Composites

ChemPhysChem ◽  
2013 ◽  
Vol 14 (9) ◽  
pp. 1926-1933 ◽  
Author(s):  
Ana Catarina Lopes ◽  
Sonia A. C. Carabineiro ◽  
Manuel Fernando R. Pereira ◽  
Gabriela Botelho ◽  
Senentxu Lanceros-Mendez
Keyword(s):  
Optical Properties ◽  
Concentration Dependence ◽  
Vinylidene Fluoride ◽  
Nanoparticle Size ◽  
Phase Content ◽  
Electrical And Optical Properties ◽  
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.

scholarly journals Fabrication of electroactive poly(vinylidene fluoride) through non-isothermal crystallization and supercritical CO2 processing

RSC Advances ◽  
2017 ◽  
Vol 7 (77) ◽  
pp. 48712-48722 ◽  
Author(s):  
Ji Eun Lee ◽  
Yanting Guo ◽  
Richard Eungkee Lee ◽  
Siu Ning Leung
Keyword(s):  
Isothermal Crystallization ◽  
Supercritical Co2 ◽  
Vinylidene Fluoride ◽  
Phase Content ◽  
Poly Vinylidene Fluoride ◽  
New Strategy

A new strategy using non-isothermal crystallization and supercritical CO2 processing is found to promote the electroactive phase content in PVDF.

scholarly journals Influence of molecular weight on dielectric properties and piezoelectric constant of poly(vinylidene fluoride) membranes obtained by electrospinning

Polimery ◽  
2021 ◽  
Vol 66 (10) ◽  
pp. 532
Author(s):  
Aminatul Sobirah Zahari ◽  
Muhammad Hafiz Mazwir ◽  
Izan Izwan Misnon
Keyword(s):  
Molecular Weight ◽  
Dielectric Properties ◽  
Vinylidene Fluoride ◽  
Electrochemical Impedance ◽  
Piezoelectric Constant ◽  
Phase Content ◽  
X Ray Diffraction ◽  
X Ray ◽  
Β Phase ◽  
Poly Vinylidene Fluoride

A significant influence of the molecular weight on the dielectric properties and piezoelectric constant of poly(vinylidene fluoride) (PVDF) membranes obtained by electrospinning was demonstrated. Electrochemical impedance spectroscopy and d33 meter were used to evaluate dielectric properties and piezoelectric constant respectively. The presence of the β-phase was determined by Fourier transform infrared spectroscopy (FTIR) and X-Ray diffraction (XRD). The membranes with the lowest molecular weight (180,000 g/mol) possessed the best dielectric properties. They also had the highest piezoelectric constant (21 pC/N) and dielectric constant (2.9 at 50 Hz) as well as the highest β-phase content (80.25%).

Enhanced ferroelectricity and energy storage in poly(vinylidene fluoride)–clay nanocomposite films via nanofiller surface charge modulation

RSC Advances ◽  
2015 ◽  
Vol 5 (104) ◽  
pp. 85884-85888 ◽  
Author(s):  
Y. Wang ◽  
J. Li ◽  
Y. Deng
Keyword(s):  
Energy Storage ◽  
Composite Film ◽  
Vinylidene Fluoride ◽  
Electronic Devices ◽  
Nanocomposite Films ◽  
Simultaneous Increase ◽  
Organic Electronic Devices ◽  
Organic Electronic ◽  
Poly Vinylidene Fluoride ◽  
Charge Modulation

Simultaneous increase in ferroelectricity and energy storage was achieved in pvdf/mmt composite film indicating a good candidate for all-organic electronic devices.

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