scholarly journals PREPARATION METHOD OF NZVI-PVDF HYBRID FILMS WITH CATION-EXCHANGE FUNCTION FOR REDUCTIVE TRANSFORMATION OF CR(VI)

2018 ◽  
Vol 26 (1) ◽  
pp. 19-27 ◽  
Author(s):  
Xiangyu WANG ◽  
Shan CONG
Keyword(s):  
Acrylic Acid ◽  
Vinylidene Fluoride ◽  
In Situ Polymerization ◽  
Reduction Process ◽  
High Reactivity ◽  
Pvdf Film ◽  
Sem Images ◽  
Poly Vinylidene Fluoride ◽  
Exchange Function

Poly (vinylidene fluoride) (PVDF) microporous film was successfully synthesized and functionalized by poly acrylic acid (PAA) for immobilization of nanoscale zero-valent iron (NZVI). PAA was innovatively introduced onto PVDF film via in situ polymerization of acrylic acid (AA) and followed by ion exchange procedure. The as-prepared PAA/PVDF-NZVI hybrids (PPN) were characterized in terms of morphology (SEM) and surface functional groups (FTIR). FTIR spectra confirms the functionalization of PVDF film by coating of PAA within its micropores. And SEM images suggested that NZVI were well immobilized onto the surface of the support. Over the reaction course, the resultant PPN hybrids demonstrated high reactivity, excellent stability and reusability for Cr(VI) removal. Results showed that lower pH and initial concentration facilitated the removal of Cr(VI) by PPN. Compared with bare NZVI, PAA/PVDF film-immobilized NZVI resulted in a lower activation energy for Cr(VI) removal, indicating that Cr(VI) reduction process with PPN is a surfacecontrolled chemical reaction. Moreover, a two-parameter pseudo-first-order model was provided and well-described the reaction kinetics of Cr(VI) over PPN under various conditions.

scholarly journals Achieving high performance poly(vinylidene fluoride) dielectric composites via in situ polymerization of polypyrrole nanoparticles on hydroxylated BaTiO3 particles

2019 ◽  
Vol 10 (35) ◽  
pp. 8224-8235 ◽  
Author(s):  
Xu Xie ◽  
Zhen-zhen He ◽  
Xiao-dong Qi ◽  
Jing-hui Yang ◽  
Yan-zhou Lei ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
High Performance ◽  
Vinylidene Fluoride ◽  
In Situ Polymerization ◽  
Composite Particles ◽  
Poly Vinylidene Fluoride ◽  
Polypyrrole Nanoparticles

PPy@BTOH composite particles with a ‘mulberry-like’ structure are fabricated to prepare dielectric composites with excellent comprehensive dielectric properties.

PVDF promotes TiO2 dispersion to obtain composite films with high dielectric constant and low loss

2021 ◽  
pp. 095400832110440
Author(s):  
Mingyun Peng ◽  
Ke Li ◽  
Bingliang Huang ◽  
Jie Cheng
Keyword(s):  
Dielectric Constant ◽  
Room Temperature ◽  
Vinylidene Fluoride ◽  
In Situ Polymerization ◽  
Composite Films ◽  
Low Loss ◽  
Three Phase ◽  
Poly Vinylidene Fluoride ◽  
High Dielectric

A series of three-phase composite films with different filler contents were prepared by in-situ polymerization. The composite films comprise polyimide (PI), poly (vinylidene fluoride) (PVDF), and titanium dioxide (TiO2). Compared with PI/TiO2 composite films, the PI/TiO2-PVDF composite films not only get a significant increase in dielectric constant, but also own better mechanical properties. Our results show that with the loading of 50wt% PVDF particles, the dielectric constant of PI/TiO2-PVDF composite films increased from 6.5 to 18.14 at 1 MHz and room temperature, while the tensile strength of PI/TiO2-PVDF composite films increased from 45 to 72 MPa. In addition, the films maintain a low loss tangent of about 0.02. PI/PVDF composite films were also prepared. It was found that dielectric constant of PI/PVDF composite was significantly lower than that of PI/TiO2-PVDF composite films when the loading of PVDF is 50wt%.

scholarly journals Poly(vinylidene fluoride) grafted polystyrene (PVDF-g-PS) membrane based on in situ polymerization for solvent resistant nanofiltration

RSC Advances ◽  
2017 ◽  
Vol 7 (53) ◽  
pp. 33201-33207 ◽  
Author(s):  
Fang Yuan ◽  
Yi Yang ◽  
Rui Wang ◽  
Dongju Chen
Keyword(s):  
Vinylidene Fluoride ◽  
In Situ Polymerization ◽  
Poly Vinylidene Fluoride

A poly(vinylidene fluoride) grafted polystyrene (PVDF-g-PS) membrane was prepared by in situ polymerization methods and applied in solvent resistant nanofiltration (SRNF).

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