Electrospun porous poly(tetrafluoroethylene-<i>co</i>-hexafluoropropylene-<i>co</i>-vinylidene fluoride) membranes for membrane distillation

Zhang, Yong; Yang, Bin; Li, Kuiling; Hou, Deyin; Zhao, Changwei; Wang, Jun

doi:10.1039/c7ra09932k

Cited by 50 publications

(23 citation statements)

References 48 publications

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“…The contact angles of the current study are approximately 10°higher compared to the results by Zhang et al (21) and match the previous results of Ok et al (20). This shows that slightly below super hydrophobicity (>150°) character of the electrospun THV fibers is reproducible and independent of most of the experimental parameters including solvent type and applied voltage compared to the previous reports (20,21), as well as the morphology of the electrospun fibers.…”

Section: Hydrophobicitysupporting

confidence: 66%

“…This increase in the water contact angle was attributed to the increase in roughness of the THV-221 G films (31). In the report by Zhang et al (21), the lowest contact angle (110°) for water was measured on the fiber membranes obtained from 10 wt% THV solution in 100% DMF at 15 kV applied voltage. All the other contact angles for water on the electrospun THV fiber membranes were between 125.6°a nd 131.4°, lower than the values of the present report.…”

Section: Hydrophobicitymentioning

confidence: 99%

“…Although the electrospinning technique has been employed in polymeric fiber formation (6,7), there are only two short reports on electrospun THV fiber-like structures and fiber formation (20,21). Contrary to the report by Ok et al (20) where the polymer solution concentration was varied from 8.4 to 20 wt%, the solution concentration was not varied in the present study, while solvent type, needle size, applied voltage, and feed rate differed from the studies by Ok et al (20) and Zhang et al (21). Moreover, in the report by Ok et al (20), Wyoming montmorillonite with low Mg was utilized, and in the present study, Ca-rich Texas montmorillonite has been used.…”

Section: Introductionmentioning

confidence: 99%

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Wetting behaviors of fluoroterpolymer fiber films

Sheets

Welch

et al. 2020

E-Polymers

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Various aspects of electrospun fibers prepared from terpolymer of tetrafluoroethylene (TFE), hexafluoropropylene (HFP), and vinylidene fluoride (VDF) (THV)/acetone solutions at two applied voltages, THV/acetone solutions having Texas montmorillonite with two ratios, and THV/ethyl acetate solutions using two needle sizes are described. Fibers from THV/acetone and THV/ethyl acetate solutions showed shallow indentations and pores, respectively. The clay, functioning as electrospinning agent, did not influence the fiber morphology, but yielded narrower fiber diameter distribution and the thinnest fibers. Heterogeneous fiber diameter distribution and increase in the fiber diameters were observed by lowering the voltage for fibers of THV/acetone solutions. Fibers from THV/ethyl acetate solutions had the largest diameter and the broadest diameter distribution. Electrospun THV fibers having both hydrophobic characteristics with nearly 140° water contact angles and oleophilic properties with oil contact angles less than 45° might have applications in areas such as water/oil separation.

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Section: Hydrophobicitysupporting

confidence: 66%

Section: Hydrophobicitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Wetting behaviors of fluoroterpolymer fiber films

Sheets

Welch

et al. 2020

E-Polymers

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“…The direct electrospinning of hydrophobic polymers represents an efficient approach for the fabricating W&B membranes. To date, many types of hydrophobic polymers have been applied to fabricate W&B membranes, including polyvinylidene fluoride (PVDF), polystyrene (PS), polyethersulfone (PES), and other fluorinated copolymer …”

Section: Hydrophobic Polymer‐based Electrospun Wandb Membranesmentioning

confidence: 99%

Waterproof and Breathable Electrospun Nanofibrous Membranes

et al. 2019

Macromol. Rapid Commun.

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Waterproof and breathable (W&B) membranes combine fascinating properties of resistance to liquid water penetration and transmitting of water vapor, playing a key role in addressing problems related to health, resources, and energy. Electrospinning is an efficient and advanced way to construct nanofibrous materials with easily tailored wettability and adjustable pore structure, therefore providing an ideal strategy for constructing W&B membranes. In this review, recent progress on electrospun W&B membranes is summarized, involving materials design and fabrication, basic properties of electrospun W&B membranes associated with waterproofness and breathability, as well as their applications. In addition, challenges and future trends of electrospun W&B membranes are discussed.

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“…Indeed, such fibrous membranes could also be employed for water treatment in the membrane form. Some successful examples of electrospun fibrous membranes were reported for this purpose such as polyvinylidenefluoride-co-hexafluoropropylene [31], poly(tetrafluoroethylene-co-hexafluoropropylene-co-vinylidene fluoride) [32] and polysulfone/polydimethylsiloxane membranes [33]. On the other hand, PIMs were usually employed in the dense membrane form due to their high gas and vapor sorption inside the polymer matrix [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Development of superhydrophobic electrospun fibrous membrane of polymers of intrinsic microporosity (PIM-2)

Satilmiş

2019

European Polymer Journal

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Polymers of intrinsic microporosity (PIMs) are increasingly recognized as a potential membrane material for adsorption and separation applications due to their permanent porosity and solution processability. PIM-2 can be produced using commercially available 5,5′,6,6′-Tetrahydroxy-3,3,3′,3′-tetramethyl-1,1′-spirobisindane and decafluorobiphenyl monomers in the powder form. It possesses considerable amount of fluorine in the polymer backbone and this feature could provide significant hydrophobicity to polymer. This research aims to investigate the fabrication of self-standing PIM-2 fibrous membranes by electrospinning method to introduce a useful material for adsorption applications. Electrospinning was performed using tetrachloroethane as a solvent and beadfree, uniform fibers were produced as confirmed by SEM imaging. Average fiber diameter was calculated as 5.5 ± 1.5 μm for a self-standing fibrous membrane of PIM-2. Structural characterization was conducted using FT-IR, NMR and XPS spectroscopies showing the purity of pristine powder and fibrous membrane of PIM-2. Thermal stability of PIM-2 fibrous membrane was investigated using TGA and it shows no discernible weight loss below 450°C. The porosity of fibrous membrane was investigated by N 2 adsorption/desorption measurements that indicates significant microporosity with ∼600 m 2 g −1 BET surface area. In addition, the hydrophobicity of PIM-2 was tested by water contact angle measurements, showing 155 ± 6°WCA, indicating superhydrophobicity owing to rough surface and high fluorine content. Consequently, the combination of straightforward synthesis, solution processability, high thermal stability, high surface area, and superhydrophobicity makes PIM-2 a promising candidate for adsorption applications. Therefore, it was successfully employed in organic and oil adsorption. Fibrous membranes of PIM-2 has shown up to 2200 ± 100% and 1900 ± 100% weight gain after in contact with silicon oil and DMSO respectively. In addition, dense membrane of PIM-2 was prepared by solvent casting method and the uptake ability was compared with fibrous membrane showing that fibrous form is more convenient for liquid adsorption applications.

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Electrospun porous poly(tetrafluoroethylene-co-hexafluoropropylene-co-vinylidene fluoride) membranes for membrane distillation

Abstract: Novel THV electrospun membrane exhibits enhanced membrane distillation performance.

Cited by 50 publications

References 48 publications

Wetting behaviors of fluoroterpolymer fiber films

Wetting behaviors of fluoroterpolymer fiber films

Waterproof and Breathable Electrospun Nanofibrous Membranes

Development of superhydrophobic electrospun fibrous membrane of polymers of intrinsic microporosity (PIM-2)

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