Poling Behavior and Optical Absorption of Partially Dehydrofluorinated and Uniaxially Stretched Polyvinylidene Fluoride

Wegener, Michael; Küunstler, W.; Gerhard, Reimund

doi:10.1080/00150190600694761

Cited by 16 publications

(9 citation statements)

References 17 publications

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“…The possible complex structures in the PVDF/LLZTO-CPEs are proposed and presented in Figure b. Partial dehydrofluorination of PVDF with activated region around CC , could facilitate the acid–base interactions between PVDF, LiClO 4 , and LLZTO in the CPEs.…”

Section: Resultsmentioning

confidence: 99%

Synergistic Coupling between Li_6.75La₃Zr_1.75Ta_0.25O₁₂ and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

et al. 2017

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Easy processing and flexibility of polymer electrolytes make them very promising in developing all-solid-state lithium batteries. However, their low room-temperature conductivity and poor mechanical and thermal properties still hinder their applications. Here, we use LiLaZrTaO (LLZTO) ceramics to trigger structural modification of poly(vinylidene fluoride) (PVDF) polymer electrolyte. By combining experiments and first-principle calculations, we find that La atom of LLZTO could complex with the N atom and C═O group of solvent molecules such as N,N-dimethylformamide along with electrons enriching at the N atom, which behaves like a Lewis base and induces the chemical dehydrofluorination of the PVDF skeleton. Partially modified PVDF chains activate the interactions between the PVDF matrix, lithium salt, and LLZTO fillers, hence leading to significantly improved performance of the flexible electrolyte membrane (e.g., a high ionic conductivity of about 5 × 10 S cm at 25 °C, high mechanical strength, and good thermal stability). For further illustration, a solid-state lithium battery of LiCoO|PVDF-based membrane|Li is fabricated and delivers satisfactory rate capability and cycling stability at room temperature. Our study indicates that the LLZTO modifying PVDF membrane is a promising electrolyte used for all-solid-state lithium batteries.

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Section: Resultsmentioning

confidence: 99%

Synergistic Coupling between Li_6.75La₃Zr_1.75Ta_0.25O₁₂ and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

et al. 2017

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“…This usually decreases the response time of the sensor device and leads to less sensitivities due to the increase of heat capacitance. Former developments followed the approach to enhance the absorption efficiency of ferroelectric PVDF itself by dehydrofluorination, whereby light-absorbing double-bonds are generated [8,9].…”

Section: Introductionmentioning

confidence: 99%

Multifunctional Silver Poly(vinylidene fluoride) Nanocomposites: Nanoparticle Synthesis, Film Processing, and Structural Characterization

2010

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Scope of this work was the synthesis of homogeneously dispersed silver nanoparticles in the ferroelectric polymer poly(vinylidene fluoride) (PVDF) and the study of the resulting properties affecting both the electro-active matrix and the optically-active nanofiller.In the nanocomposites surface plasmon resonances can be tuned across the UV-vis to the NIR spectral range. From IR spectra and DSC measurements it is concluded that the α-to β-phase transformation is observed and no degradation of the polymer matrix occurs. Finally, electrical poling was performed in order to investigate the influence of the embedded silver particles on the polarization behavior of the ferroelectric polymer.

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“…Two significant peaks appeared, which are a shoulder at around 1595 cm −1 and a peak at 1740 cm −1 attributable to the respective −CC− stretch and −CO− stretch in the FTIR spectrum of NaOH treated membrane. The presence of the former characteristic band could be due to the dehydrofluorination of PVDF, which eventually leads to the formation of carbon−carbon double bond as a result of the reaction between NaOH and PVDF. , The presence of the latter peak at 1740 cm −1 that is assigned to the −CO− stretch may also be caused by the dehydrofluorination of PVDF, where the reaction has allowed the formation of a carbonyl group between the carbon compound in PVDF and the oxygen from SiO 2 . The degradation of the PVDF hollow fiber membrane occurred after the course of NaOH treatment, and this phenomenon elucidates the cause of the reduction in membrane mechanical strength.…”

Section: Resultsmentioning

confidence: 99%

Preparation of PVDF Hollow Fiber Membranes Using SiO₂ Particles: The Effect of Acid and Alkali Treatment on the Membrane Performances

Hashim

Liu

2011

Ind. Eng. Chem. Res.

108

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This work presents the preparation of PVDF hollow fiber membranes using SiO2 particles as an additive via a conventional immersion precipitation method. The asymmetric membrane formed consists of a uniform distribution of finger-like structure near the inner layer with sponge-like structure near the outer layer. SiO2 particles were removed from the spun membranes by a treatment using either sodium hydroxide (NaOH) solution or hydrofluoric (HF) acid. Both the NaOH solution and HF acid treatments have resulted in PVDF hollow fiber membranes with enhanced water permeability of up to 748.4 L/m2·h and 690.7 L/m2·h, respectively. HF acid was found to be more efficient in dissolving SiO2 and subsequently washing the particles out of the membrane for only 10 min compared to the treatment with NaOH solution, which took almost 1 h for complete removal. Mechanical properties of hollow fiber membrane treated with HF acid was found to be almost unaffected and showed a much better ductile behavior compared to the original one; while the one treated with NaOH solution possessed poor mechanical properties.

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Poling Behavior and Optical Absorption of Partially Dehydrofluorinated and Uniaxially Stretched Polyvinylidene Fluoride

Cited by 16 publications

References 17 publications

Synergistic Coupling between Li_6.75La₃Zr_1.75Ta_0.25O₁₂ and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

Synergistic Coupling between Li_6.75La₃Zr_1.75Ta_0.25O₁₂ and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

Multifunctional Silver Poly(vinylidene fluoride) Nanocomposites: Nanoparticle Synthesis, Film Processing, and Structural Characterization

Preparation of PVDF Hollow Fiber Membranes Using SiO₂ Particles: The Effect of Acid and Alkali Treatment on the Membrane Performances

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Poling Behavior and Optical Absorption of Partially Dehydrofluorinated and Uniaxially Stretched Polyvinylidene Fluoride

Cited by 16 publications

References 17 publications

Synergistic Coupling between Li6.75La3Zr1.75Ta0.25O12 and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

Synergistic Coupling between Li6.75La3Zr1.75Ta0.25O12 and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

Multifunctional Silver Poly(vinylidene fluoride) Nanocomposites: Nanoparticle Synthesis, Film Processing, and Structural Characterization

Preparation of PVDF Hollow Fiber Membranes Using SiO2 Particles: The Effect of Acid and Alkali Treatment on the Membrane Performances

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Synergistic Coupling between Li_6.75La₃Zr_1.75Ta_0.25O₁₂ and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

Synergistic Coupling between Li_6.75La₃Zr_1.75Ta_0.25O₁₂ and Poly(vinylidene fluoride) Induces High Ionic Conductivity, Mechanical Strength, and Thermal Stability of Solid Composite Electrolytes

Preparation of PVDF Hollow Fiber Membranes Using SiO₂ Particles: The Effect of Acid and Alkali Treatment on the Membrane Performances