PVDF Fibers Modification by Nitrate Salts Doping

Sobola, Dinara; Kaspar, Pavel; Částková, Klára; Dallaev, Rashid; Papěž, Nikola; Sedlák, Petr; Trčka, Tomáš; Orudzhev, Farid; Kaštyl, Jaroslav; Weiser, Adam; Knápek, Alexandr; Holcman, Vladimír

doi:10.3390/polym13152439

Cited by 37 publications

(35 citation statements)

References 34 publications

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“…Assuming pure PVDF to be 100%, the relative crystallinity, γ c , is determined by formula [ 65 ]

where ∆ H f , the enthalpy of fusion, was determined as area below melting peaks, ∆ H f0 represents the heat of fusion for the pure crystalline PVDF (for this case 104.7 J/g [ 27 ]) and φ denotes the weight fraction of PVDF in a mixture. The relative crystallinity was estimated to be 92.64% for SPE 80 °C 90 s, 73.24% for SPE 120 °C 90 s, 57.51% for SPE 120 °C 210 s and 44.55% for SPE 160 °C 600 s. The PVDF/NMP/[EMIM][TFSI] electrolytes under the test exhibited lower

as intensity of solvent evaporation increases during the preparation process.…”

Section: Resultsmentioning

confidence: 99%

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Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

et al. 2021

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Thermal treatment conditions of solid polymer polymer electrolyte (SPE) were studied with respect to their impact on the surface morphology, phase composition and chemical composition of an imidazolium ionic-liquid-based SPE, namely PVDF/NMP/[EMIM][TFSI] electrolyte. These investigations were done using scanning electron microscopy, Raman spectroscopy, Fourier transform infrared spectroscopy, differential scanning calorimetry as well as X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectroscopy. A thoroughly mixed blend of polymer matrix, ionic liquid and solvent was deposited on a ceramic substrate and was kept at a certain temperature for a specific time in order to achieve varying crystallinity. The morphology of all the electrolytes consists of spherulites whose average diameter increases with solvent evaporation rate. Raman mapping shows that these spherulites have a semicrystalline structure and the area between them is an amorphous region. Analysis of FTIR spectra as well as Raman spectroscopy showed that the β-phase becomes dominant over other phases, while DSC technique indicated decrease of crystallinity as the solvent evaporation rate increases. XPS and ToF-SIMS indicated that the chemical composition of the surface of the SPE samples with the highest solvent evaporation rate approaches the composition of the ionic liquid.

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“…Assuming pure PVDF to be 100%, the relative crystallinity, γ c , is determined by formula [ 65 ]

as intensity of solvent evaporation increases during the preparation process.…”

Section: Resultsmentioning

confidence: 99%

“…The temperature d between melting and crystallization is connected to the kinetics of crystallization ymer chains reorganization and recrystallization [27]. Assuming pure PVDF to be 100%, the relative crystallinity, γ c , is determined by formula [65]…”

Section: Differential Scanning Calorimetrymentioning

confidence: 99%

Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

et al. 2021

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“…(DMSO, Sigma Aldrich), acetone p.a. (Ac, Sigma Aldrich), acetic acid (AA, Penta, Bratislava, Slovakia), and formic acid (FA, Merck, Darmstadt, Germany) were used for polymers solutions preparation [ 18 , 19 , 20 , 38 , 39 ]. For PVDF solutions, solvents DMSO and Ac were mixed in a volume ratio 7:3.…”

Section: Methodsmentioning

confidence: 99%

“…One of the most used fabrication techniques for the preparation of fibrous structures, which can be used as tribomaterials, is electrospinning [ 18 , 19 , 20 ]. During the electrospinning, a polymer solution is ejected from a needle tip by applying a high voltage between the needle and a grounded collector, as illustrated in Figure 1 b.…”

Section: Introductionmentioning

confidence: 99%

Triboelectric Response of Electrospun Stratified PVDF and PA Structures

et al. 2022

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Utilizing the triboelectric effect of the fibrous structure, a very low cost and straightforward sensor or an energy harvester can be obtained. A device of this kind can be flexible and, moreover, it can exhibit a better output performance than a device based on the piezoelectric effect. This study is concerned with comparing the properties of triboelectric devices prepared from polyvinylidene fluoride (PVDF) fibers, polyamide 6 (PA) fibers, and fibrous structures consisting of a combination of these two materials. Four types of fibrous structures were prepared, and then their potential for use in triboelectric devices was tested. Namely, individual fibrous mats of (i) PVDF and (ii) PA fibers, and their combination—(iii) PVDF and PA fibers intertwined together. Finally, the fourth kind was (iv), a stratified three-layer structure, where the middle layer from PVDF and PA intertwined fibers was covered by PVDF fibrous layer on one side and by PA fibrous layer on the opposite side. Dielectric properties were examined and the triboelectric response was investigated in a simple triboelectric nanogenerator (TENG) of individual or combined (i–iv) fibrous structures. The highest triboelectric output voltage was observed for the stratified three-layer structure (the structure of iv type) consisting of PVDF and PA individual and intertwined fibrous layers. This TENG generated 3.5 at peak of amplitude at 6 of excitation frequency and was most sensitive at the excitation signal. The second highest triboelectric response was observed for the individual PVDF fibrous mat, generating 2.8 at peak at the same excitation frequency. The uniqueness of this work lies in the dielectric and triboelectric evaluation of the fibrous structures, where the materials PA and PVDF were electrospun simultaneously with two needles and thus created a fibrous composite. The structures showed a more effective triboelectric response compared to the fibrous structure electrospun by one needle.

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“…Transition temperatures and enthalpies were determined using differential scanning calorimetry from peak integration in Figure 6. Crystalline phases X C were gained from Equation ( 1), where it is necessary to know heat of fusion of perfect crystalline PVDF ∆H * f ϕ = 104.7 J/g [18], and calculate enthalpy of fusion ∆H f , as was mentioned above [7,19]. Of course, PVDF fracture for the PVDF/PA6 was distinguished as first.…”

Section: Materials Crystallinity Percentage Investigationmentioning

confidence: 99%

Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

et al. 2021

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The paper specifies the electrostatic spinning process of specific polymeric materials, such as polyvinylidene fluoride (PVDF), polyamide-6 (PA6, Nylon-6) and their combination PVDF/PA6. By combining nanofibers from two different materials during the spinning process, new structures with different mechanical, chemical, and physical properties can be created. The materials and their combinations were subjected to several measurements: scanning electron microscopy (SEM) to capture topography; contact angle of the liquid wettability on the sample surface to observe hydrophobicity and hydrophilicity; crystallization events were determined by differential scanning calorimetry (DSC); X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and Fourier-transform infrared spectroscopy (FT-IR) to describe properties and their changes at the chemical level. Furthermore, for the electrical properties of the sample, the dielectric characteristics and the piezoelectric coefficient were measured. The advantage of the addition of co-polymers was to control the properties of PVDF samples and understand the reasons for the changed functionality. The innovation point of this work is the complex analysis of PVDF modification caused by mixing with nylon PA6. Here we emphasize that the application of nylon during the spin influences the properties and structure (polarization, crystallization) of PVDF.

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PVDF Fibers Modification by Nitrate Salts Doping

Cited by 37 publications

References 34 publications

Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

Surface Analyses of PVDF/NMP/[EMIM][TFSI] Solid Polymer Electrolyte

Triboelectric Response of Electrospun Stratified PVDF and PA Structures

Structure Tuning and Electrical Properties of Mixed PVDF and Nylon Nanofibers

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