Solvent driven polymorphism in Langmuir and Langmuir Schaefer film of poly(vinylidene fluoride)

Kumar, Chandan; Viswanath, P.

doi:10.1016/j.eurpolymj.2016.11.021

Cited by 11 publications

(5 citation statements)

References 46 publications

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“…The minimum area per repeating unit is less than 1 Å 2 for both films. These results are in accordance with the literature and can be explained by the fact that the PVDF homopolymer and the PVDF-PMMA copolymer are not able to form true monolayers in Langmuir films. , …”

Section: Resultssupporting

confidence: 92%

“…These results are in accordance with the literature and can be explained by the fact that the PVDF homopolymer and the PVDF-PMMA copolymer are not able to form true monolayers in Langmuir films. 38,39 The isotherm corresponding to PVDF-PMMA shows a plateau, as seen in the inset of Figure 2. This behavior cannot be observed in the isotherm of PVDF.…”

Section: Resultsmentioning

confidence: 97%

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Studies of Langmuir and Langmuir–Schaefer Films of Poly(3-Hexylthiophene) and Poly(Vinylidene Fluoride)

et al. 2020

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The synergistic use of blends of regioregular poly(3-hexylthiophene) (P3HT) and poly(vinylidene fluoride) (PVDF) or poly((vinylidene fluoride)-block-(methyl methacrylate)) (PVDF-PMMA) to form Langmuir and Langmuir–Schaefer (LS) films is reported. P3HT has wide applications in sensor devices because of its properties such as conductivity, luminescence, and chromism; however, the stiffness of the films and the difficulty in organizing the molecules may pose a problem in these applications. In this context, polymers based on PVDF can be used in the formation of thin P3HT films and present an alternative to improve the organization of P3HT molecules. In addition, PVDF acts as a plasticizer, making the film less rigid. The films were obtained from the blends of P3HT/PVDF and P3HT/PVDF-PMMA in a solution containing chloroform and DMAc (N,N-dimethylacetamide). Surface pressure isotherms, in situ ultraviolet–visible (UV–vis) spectroscopy, polarization-modulation infrared reflection-absorption spectroscopy, and Brewster angle microscopy techniques were used to analyze Langmuir films. The surface morphology of LS films was characterized by atomic force microscopy and UV–vis spectroscopy, and their degradation was analyzed by UV–vis spectroscopy after exposure to natural light under atmospheric conditions. The Langmuir films containing PVDF indicate a direct formation of the ferroelectric β phase, with dipoles parallel to the water surface. The Langmuir films formed by P3HT presented dipoles of side chains parallel and aromatic groups perpendicular to the water surface. P3HT and PVDF or PVDF-PMMA films show high molecular organization compared with pure P3HT films. The results suggest that these films could be used to improve the properties of P3HT in several device applications, such as in optical and electrical sensors.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Studies of Langmuir and Langmuir–Schaefer Films of Poly(3-Hexylthiophene) and Poly(Vinylidene Fluoride)

et al. 2020

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“…In the work by Kumar et al, HSPs were applied to identify suitable solvents for PVDF dissolution (DMSO and DMF) and for PVDF swelling (acetone, methyl ethyl ketone (MEK) and tetrahydrofuran (THF)) in order to form

and

phases, respectively [ 118 ]. Thin films were produced by dissolving/swelling PVDF in the desired solvent at 1 mg/mL loading at room temperature before casting drop wise on the water surface (air–water interface—Langmuir–Schaefer methodology) to give an oriented, single layer film.…”

Section: Solubility Of Pvdfmentioning

confidence: 99%

On the Solubility and Stability of Polyvinylidene Fluoride

et al. 2021

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This literature review covers the solubility and processability of fluoropolymer polyvinylidine fluoride (PVDF). Fluoropolymers consist of a carbon backbone chain with multiple connected C–F bonds; they are typically nonreactive and nontoxic and have good thermal stability. Their processing, recycling and reuse are rapidly becoming more important to the circular economy as fluoropolymers find widespread application in diverse sectors including construction, automotive engineering and electronics. The partially fluorinated polymer PVDF is in strong demand in all of these areas; in addition to its desirable inertness, which is typical of most fluoropolymers, it also has a high dielectric constant and can be ferroelectric in some of its crystal phases. However, processing and reusing PVDF is a challenging task, and this is partly due to its limited solubility. This review begins with a discussion on the useful properties and applications of PVDF, followed by a discussion on the known solvents and diluents of PVDF and how it can be formed into membranes. Finally, we explore the limitations of PVDF’s chemical and thermal stability, with a discussion on conditions under which it can degrade. Our aim is to provide a condensed overview that will be of use to both chemists and engineers who need to work with PVDF.

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“…This can contribute to the higher viscosity of the PVDF solution using 60% acetone [ 23 ]. However, when the DMF ratio is increased to 50% in the solution, the high polarity of DMF contributes to the orientation of the polymer configuration [ 26 ]. This may lead to variances in the degrees of chain entanglement, leading to the lower viscosity of the PVDF solution using 50% acetone.…”

Section: Resultsmentioning

confidence: 99%

Facile One-Step Synthesis of PVDF Bead-on-String Fibers by Pressurized Gyration for Reusable Face Masks

et al. 2022

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Single-use face masks pose a threat to the environment and are not cost-effective, which prompts the need for developing reusable masks. In this study, pressurized gyration (PG) successfully produced bead-on-string polyvinylidene fluoride (PVDF) fibers with fiber diameters ranging from 2.3 μm to 26.1 μm, and bead diameters ranging from 60.9 μm to 88.5 μm by changing the solution parameters. The effect of the solution parameters on the crystalline phase was studied by Fourier-transform infrared spectroscopy (FT-IR), where the β-phase contents of PG PVDF fibers reached over 75%. The fiber morphology and β-phase contents of PG PVDF fibers indicated the potential mechanical and electrostatic filtration efficiency of PG PVDF fibers, respectively. Additionally, the hydrophobicity was investigated by static water contact angle tests, and the PVDF fibers showed superior hydrophobicity properties (all samples above 125°) over commercial polypropylene (PP) single-use masks (approximately 107°). This study supports the notion that the PG PVDF fiber mats are a promising candidate for future reusable face masks.

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Solvent driven polymorphism in Langmuir and Langmuir Schaefer film of poly(vinylidene fluoride)

Cited by 11 publications

References 46 publications

Studies of Langmuir and Langmuir–Schaefer Films of Poly(3-Hexylthiophene) and Poly(Vinylidene Fluoride)

Studies of Langmuir and Langmuir–Schaefer Films of Poly(3-Hexylthiophene) and Poly(Vinylidene Fluoride)

On the Solubility and Stability of Polyvinylidene Fluoride

Facile One-Step Synthesis of PVDF Bead-on-String Fibers by Pressurized Gyration for Reusable Face Masks

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