Effect of annealing process on the phase formation in poly(vinylidene fluoride) thin films

Abdullah, Ibtisam Yahya; Yahaya, Muhammad; Jumali, Mohd Hafizuddin Haji; Shanshool, Haider Mohammed

doi:10.1063/1.4895187

Cited by 44 publications

(34 citation statements)

References 15 publications

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“…4 is examined, the XRD peak, which is seen at an angle of ~ 20.5°, shows the βcrystal phase formation in the nanocomposite structures we produced. XRD peaks at ~ 18º -19º angles indicate αand γ-crystal phase formation [30,37]. As can be seen, the addition of TM to the material resulted in an increase in both the α-crystal structure of the material and the polar βand γcrystal structures.…”

Section: Resultsmentioning

confidence: 91%

Tourmaline Nanoparticles Doped Polyvinylidene Fluoride (PVDF) Nanofibers

Bayramol

Ağırgan²,

Yıldız³

2020

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The aim of this work is to produce tourmaline (TM) doped polyvinylidene fluoride (PVDF) nano-composite fibers. TM-containing PVDF nanofibers were produced via a horizontally located electrospinning unit. N,N-dimethylformamide (DMF) and acetone were used as solvents. The amount of PVDF or PVDF/TM in the polymer solution was 20 wt.%. PVDF was dissolved in DMF in presence of heat by using a magnetic stirrer while TM powder was dispersed in Acetone in absence of heat by using an ultrasonic stirrer. These two solutions were then mixed for TM/PVDF nanocomposite fiber production. Pristine PVDF nanofibers were also electrospun as control samples. Produced nano-surfaces were analyzed under scanning electron microscopy (SEM), Fourier-transform Infrared Spectroscopy (FTIR), X-Ray Diffraction (XRD). Voltage generation capacities were investigated by recording the voltage outputs of samples under an applied rotational impact. The peak voltage produced by the TM doped PVDF nanocomposite fibers was higher than the PVDF nanofibers.

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Section: Resultsmentioning

confidence: 91%

Tourmaline Nanoparticles Doped Polyvinylidene Fluoride (PVDF) Nanofibers

Bayramol

Ağırgan²,

Yıldız³

2020

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“…PVDF is semicrystalline in nature consisting of five crystalline structures, namely α, β, γ, δ and ε, among which α and β are the most predominant conformations reported in membranes 48,49 . The α phase consists of mainly the trans ‐ gauche (TG + TG − ) configuration, whereas the β phase consists of the trans configuration (TTTT) only 25,48–50 . The non‐polar conformation of the α form is relatively more stable compared to the polar β form and is observed to be a major constituent 25,48 .…”

Section: Resultsmentioning

confidence: 99%

“…The non‐polar conformation of the α form is relatively more stable compared to the polar β form and is observed to be a major constituent 25,48 . The characteristic diffraction peak at 19.5° represents the 110 plane reflection of the α phase whereas the peak corresponding to the reflections of the β and γ phase are not observed 48–51 . PVDF membranes are reported to have a small quantity of β form crystals along with α form.…”

Section: Resultsmentioning

confidence: 99%

“…However, the presence of only the α phase indicates that this phase has grown at the expense of other phases. The area under the peak represents the crystalline phase and the amorphous region gives rise to the broad diffraction pattern 25,50 . The percentage crystallinity was calculated by dividing the area under the peak by the total area under the curve; it is observed to be increasing with acetone concentration and attains a constant value for Ac40 and beyond (Fig.…”

Section: Resultsmentioning

confidence: 99%

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Effect of mixed solvents on phase inversion of polymeric membranes

Kurada

Agarwal

2020

Polymer International

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The thermodynamics of phase inversion of polyvinylidene fluoride membrane with mixed solvents (N,N‐dimethyl formamide (DMF) and acetone) were modeled using Flory–Huggins theory. The kinetics of phase inversion were studied by measuring solvent concentration in the precipitation bath. A model was proposed to predict the time‐dependent solvent concentration profile in the precipitation bath. Depending on solvent volatility, the duration of the kinetics‐dominated regime and the evaporation‐dominated regime varies. A comparative analysis of thermodynamic and kinetic factors was used to predict membrane morphology and it was observed that the system under consideration was thermodynamics dominated. The membrane porosity exhibited decreasing porosity up to the Ac60 membrane (acetone to DMF ratio 60) and thereafter the membrane sublayer showed small pores. Addition of acetone resulted in increased crystallinity and surface hydrophilicity. The mean flow pore diameter measured using a liquid–liquid porometer decreased from 105 nm for an Ac0 membrane (acetone to DMF ratio 0) to 17 nm for an Ac60 membrane. Correspondingly, the molecular weight cut‐off of the membranes decreased from 135 kDa (for the Ac0 membrane) to 104 kDa (for the Ac60 membrane). The model proposed in this work can be used as a tool to predict the properties of intermediate compositions and prepare tailor‐made membranes with desired properties. © 2020 Society of Chemical Industry

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“…The IR data shows that the positions of these absorption peaks did not change much indicating that [EMIM] [BF 4 ] and PVDF have good miscibility in NMP, and the crystal structure of PVDF remains constant. The peak due to the β-Phase is identified at 886 cm −1 (Ibtisam et al, 2014). With increasing of PVDF concentration, the β-phase intensity of PVDF increases gradually, and the β phase intensity in Figure 3a is obviously larger.…”

Section: Resultsmentioning

confidence: 99%

A Printed and Flexible NO2 Sensor Based on a Solid Polymer Electrolyte

Luo

et al. 2019

Front. Chem.

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Solid polymer electrolyte (SPE) is an important part of printed electrochemical gas sensors and are of value to electrochemical sensors. Here, a new type of SPE was prepared by dissolving a poly-vinylidene fluoride (PVDF) matrix in a 1-methyl-2-pyrrolidone (NMP) to immobilize 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM] [BF 4 ]), which was then used in a new electrochemical amperometric nitrogen dioxide sensor. The SPE was coated on a single electrode and attached to the electrode to construct a simple two-layer structure. Nitrogen dioxide in the air was reduced on the working electrode at a bias voltage of −500 V. We controlled the components and process parameters separately for control experiments. The results show that the SPE based on [EMIM] [BF 4 ], NMP, and PVDF coated on the electrode at a thickness of 1.25 mm with a 1:1:4 weight ratio under heat treatment conditions of 80°C for 2 min has the best sensitivity. The FTIR and XPS results indicated that SPE is prepared via physical miscibility. The SEM and XRD results showed that the sensitivity of the sensor is strongly dependent on the interconnected pore structure in SPE, and the pore structure is related to the synthesis ratio, morphology, and heat treatment mode of SPE. Moreover, the sensor sensitivity has a certain relationship with SPE conductivity. The reaction principle and cycle performance of the sensor were also studied.

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Effect of annealing process on the phase formation in poly(vinylidene fluoride) thin films

Cited by 44 publications

References 15 publications

Tourmaline Nanoparticles Doped Polyvinylidene Fluoride (PVDF) Nanofibers

Tourmaline Nanoparticles Doped Polyvinylidene Fluoride (PVDF) Nanofibers

Effect of mixed solvents on phase inversion of polymeric membranes

A Printed and Flexible NO2 Sensor Based on a Solid Polymer Electrolyte

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