scholarly journals Effects of configurational changes on molecular dynamics in polyvinylidene fluoride and poly(vinylidene fluoride-trifluoroethylene) ferroelectric polymers

2015 ◽  
Vol 107 (8) ◽  
pp. 082907 ◽  
Author(s):  
N. Jalarvo ◽  
A. Pramanick ◽  
C. Do ◽  
S. O. Diallo
Keyword(s):  
Molecular Dynamics ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Ferroelectric Polymers ◽  
Poly Vinylidene Fluoride

scholarly journals Preparation and Electrochemical Characterization of Organic–Inorganic Hybrid Poly(Vinylidene Fluoride)-SiO2 Cation-Exchange Membranes by the Sol-Gel Method Using 3-Mercapto-Propyl-Triethoxyl-Silane

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3265 ◽  
Author(s):  
Li ◽  
Li ◽  
Li ◽  
Guan ◽  
Zheng ◽  
...  
Keyword(s):  
Membrane Potential ◽  
Oxidative Stability ◽  
Water Uptake ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Sol Gel ◽  
Synthesis Method ◽  
Co2 Production ◽  
Inorganic Hybrid ◽  
Poly Vinylidene Fluoride

A new synthesis method for organic–inorganic hybrid Poly(vinylidene fluoride)-SiO2 cation-change membranes (CEMs) is proposed. This method involves mixing tetraethyl orthosilicate (TEOS) and 3-mercapto-propyl-triethoxy-silane (MPTES) into a polyvinylidene fluoride (PVDF) sol-gel solution. The resulting slurry was used to prepare films, which were immersed in 0.01 M HCl, which caused hydrolysis and polycondensation between the MPTES and TEOS. The resulting Si-O-Si polymers chains intertwined and/or penetrated the PVDF skeleton, significantly improving the mechanical strength of the resulting hybrid PVDF-SiO2 CEMs. The -SH functional groups of MPTES oxidized to-SO3H, which contributed to the excellent permeability of these CEMs. The surface morphology, hybrid structure, oxidative stability, and physicochemical properties (IEC, water uptake, membrane resistance, membrane potential, transport number, and selective permittivity) of the CEMs obtained in this work were characterized using scanning electron microscope and Fourier transform infrared spectroscopy, as well as electrochemical testing. Tests to analyze the oxidative stability, water uptake, membrane potential, and selective permeability were also performed. Our organic–inorganic hybrid PVDF-SiO2 CEMs demonstrated higher oxidative stability and lower resistance than commercial Ionsep-HC-C membranes with a hydrocarbon structure. Thus, the synthesis method described in this work is very promising for the production of very efficient CEMs. In addition, the physical and electrochemical properties of the PVDF-SiO2 CEMs are comparable to the Ionsep-HC-C membranes. The electrolysis of the concentrated CoCl2 solution performed using PVDF-SiO2-6 and Ionsep-HC-C CEMs showed that at the same current density, Co2+ production, and current efficiency of the PVDF-SiO2-6 CEM membrane were slightly higher than those obtained using the Ionsep-HC-C membrane. Therefore, our novel membrane might be suitable for the recovery of cobalt from concentrated CoCl2 solutions.

Molecular investigation of oil–water separation using PVDF polymer by molecular dynamic simulation

RSC Advances ◽  
2016 ◽  
Vol 6 (78) ◽  
pp. 74124-74134 ◽  
Author(s):  
Mehdi Darvishi ◽  
Masumeh Foroutan
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulation ◽  
Vinylidene Fluoride ◽  
Dynamics Simulation ◽  
Water Separation ◽  
Molecular Investigation ◽  
Poly Vinylidene Fluoride ◽  
Adsorption Of Water ◽  
Oil Water Separation ◽  
Oil Water

In this study, adsorption of water nanodroplets, oil nanodroplets and oil–water mixtures on a poly vinylidene fluoride (PVDF) surface is investigated using molecular dynamics simulation and a mechanism for adsorption of the droplets is proposed.

Tuning the ferroelectric phase transition of PVDF by uniaxially stretching crosslinked PVDF films with CFCH bonds

2020 ◽  
Vol 8 (33) ◽  
pp. 11426-11440
Author(s):  
Xiao Wang ◽  
Baobao Qiao ◽  
Shaobo Tan ◽  
Weiwei Zhu ◽  
Zhicheng Zhang
Keyword(s):  
Phase Transition ◽  
Ferroelectric Phase Transition ◽  
Vinylidene Fluoride ◽  
Ferroelectric Phase ◽  
Relaxor Ferroelectric ◽  
Artificial Muscles ◽  
Ferroelectric Polymers ◽  
Poly Vinylidene Fluoride ◽  
Electrostrictive Properties

Poly(vinylidene fluoride) (PVDF) based relaxor ferroelectric polymers show great potential for applications in transducers, sensors and artificial muscles for their excellent electrostrictive properties.

Fabrication and Characterization of Polyvinylidene Fluoride Microfilms for Microfluidic Applications

2016 ◽  
Vol 15 (05n06) ◽  
pp. 1660013
Author(s):  
Yammani Venkat Subba Rao ◽  
Aravinda Narayanan Raghavan ◽  
Meenakshi Viswanathan
Keyword(s):  
Spin Coating ◽  
Polyvinylidene Fluoride ◽  
Vinylidene Fluoride ◽  
Microstructural Properties ◽  
Average Roughness ◽  
Microfluidic Mixer ◽  
Poly Vinylidene Fluoride ◽  
Fabrication And Characterization ◽  
Microfluidic Mixers

The ability to create patterns of piezo responsive material on smooth substrate is an important method to develop efficient microfluidic mixers. This paper reports the fabrication of Poly vinylidene fluoride microfilms using spin-coating on smooth glass surface. The suitable crystalline phases, surface morphology and microstructural properties of the PVDF films have been investigated. We found that films of average thickness 10[Formula: see text][Formula: see text]m, had average roughness of 0.13[Formula: see text][Formula: see text]m. These PVDF films are useful in microfluidic mixer applications.

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