Electrospinning PVDF/EC fibre from a binary solvent system

Lei, Tingping; Zhan, Zhan; Zuo, Wenjia; Cheng, Wei; Xu, Bulei; Su, Yuanzhe; Sun, Di

doi:10.1504/ijnm.2012.048577

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…PVDF nanobrous membranes were fabricated by electrospinning technique reported elsewhere. 110 Non-nanobrous membranes were prepared either by casting or spin coating onto RCA-cleaned silicon wafers at room temperature and some of them were further treated by a stretching process. Specically, electrospinning experiments were performed in indoor atmosphere with xed tip-to-collector distance of 10 cm and applied voltage of 7.5 kV, while casting and spin coating experiments were done in a clean room.…”

Section: Membrane Preparationmentioning

confidence: 99%

A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

et al. 2017

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Section: Membrane Preparationmentioning

confidence: 99%

A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

et al. 2017

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“…This method is very demanding in terms of energy consumption, and it is not convenient for process intensification. However, several studies have demonstrated that the random distribution of the fibers requires heat treatment to guarantee integrity and mechanical stability to the membranes [29,59]. Lei et al [59] produced fibers with a high concentration of the polymer and NMP as a solvent, confirming that the morphology was greatly influenced by the volume ratio of the binary solvent system (NMP/acetone).…”

Section: Comparison With the Literaturementioning

confidence: 99%

“…However, several studies have demonstrated that the random distribution of the fibers requires heat treatment to guarantee integrity and mechanical stability to the membranes [29,59]. Lei et al [59] produced fibers with a high concentration of the polymer and NMP as a solvent, confirming that the morphology was greatly influenced by the volume ratio of the binary solvent system (NMP/acetone). Recently, efforts have been focused on the development of PVDF ENMs using DMSO as a low toxicity solvent [60,61].…”

Section: Comparison With the Literaturementioning

confidence: 99%

Innovative Poly (Vinylidene Fluoride) (PVDF) Electrospun Nanofiber Membrane Preparation Using DMSO as a Low Toxicity Solvent

et al. 2020

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Electrospinning is an emerging technique for the preparation of electrospun fiber membranes (ENMs), and a very promising one on the basis of the high-yield and the scalability of the process according to a process intensification strategy. Most of the research reported in the literature has been focused on the preparation of poly (vinylidene fluoride) (PVDF) ENMs by using N,N- dimethylformamide (DMF) as a solvent, which is considered a mutagenic and cancerogenic substance. Hence, the possibility of using alternative solvents represents an interesting approach to investigate. In this work, we explored the use of dimethyl sulfoxide (DMSO) as a low toxicity solvent in a mixture with acetone for the preparation of PVDF-ENMs. As a first step, a solubility study of the polymer, PVDF 6012 Solef®, in several DMSO/acetone mixtures was carried out, and then, different operating conditions (e.g., applied voltage and needle to collector plate distance) for the successful electrospinning of the ENMs were evaluated. The study provided evidence of the crucial role of solution conductivity in the electrospinning phase and the thermal post-treatment. The prepared ENMs were characterized by evaluating the morphology (by SEM), pore-size, porosity, surface properties, and performance in terms of water permeability. The obtained results showed the possibility of producing ENMs in a more sustainable way, with a pore size in the range of 0.2–0.8 µm, high porosity (above 80%), and water flux in the range of 11.000–38.000 L/m2·h·bar.

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“…A standard electrospinning apparatus was employed as reported previously, where the polymer solution ow rate was controlled using a precision pump (11 Pico Plus, Harvard Inc), which pushes the syringe with a minimum feed rate of 1.3 pL min À1 by means of a stepping motor. 16 The polymer solution was made of PVDF powder with various solvent concentrations using different volume ratios of NMP and/or acetone. It is noted that NMP and acetone are a good solvent and a good swelling solvent for PVDF, respectively.…”

Section: Electrospinning and Forcespinningmentioning

confidence: 99%

Spectroscopic evidence for a high fraction of ferroelectric phase induced in electrospun polyvinylidene fluoride fibers

Lei¹,

Cai²,

Wang³

et al. 2013

RSC Adv.

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Effective transformation from paraelectric to a high fraction of ferroelectric phase is crucial to produce piezoelectric materials with a high piezoelectric constant for broad applications. In polyvinylidene fluoride (PVDF) thin films, both mechanical stretching and electric poling processes have been found to be critical in the a / b phase transformation. However, in PVDF fibers fabricated by the electrospinning process, the roles of mechanical stretching and electric poling have not been well explored. Here, the properties of PVDF fibers from electrospinning and forcespinning, a mechanical spinning process without electric poling, have been characterized and analyzed by FTIR and XRD spectroscopic techniques. The results show that pure mechanical stretching in the forcespun fibers can result in a high fraction of the all-trans b-phase, at 95%. Electrospun fibers from the same material system, on the other hand, can also reach a high fraction of b-phase, at approximately 99%. These results preliminarily demonstrate that mechanical stretching is the main reason for b-phase induction in PVDF fibers. Further experiments performed in this work show that higher wt% of PVDF, lower polymer solution supply rate, and more uniformly mixed solvent systems facilitate achieving a higher level of ferroelectric b-phase in electrospun PVDF fibers.

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Electrospinning PVDF/EC fibre from a binary solvent system

Cited by 6 publications

References 12 publications

A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

A critical analysis of the α, β and γ phases in poly(vinylidene fluoride) using FTIR

Innovative Poly (Vinylidene Fluoride) (PVDF) Electrospun Nanofiber Membrane Preparation Using DMSO as a Low Toxicity Solvent

Spectroscopic evidence for a high fraction of ferroelectric phase induced in electrospun polyvinylidene fluoride fibers

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