Explorations of combined nonsolvent and thermally induced phase separation (N-TIPS) method for fabricating novel PVDF hollow fiber membranes using mixed diluents

Jie, Zhao; Chong, Jeng Yi; Shi, Lei; Wang, Rong

doi:10.1016/j.memsci.2018.11.015

Cited by 60 publications

(28 citation statements)

References 70 publications

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“…However, this approach requires coordination between the dope mixtures and coating solution during the spinning, resulting in the whole process being relatively complex and the operating conditions being critical. Moreover, the membranes produced could exhibit some undesired delamination and irregular surface structure due to the asynchronous curing process of the dual layer [172,173].…”

Section: Methods Of Preparationmentioning

confidence: 99%

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

2019

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Porous polymeric membranes have emerged as the core technology in the field of separation. But some challenges remain for several methods used for membrane fabrication, suggesting the need for a critical review of the literature. We present here an overview on porous polymeric membrane preparation and characterization for two commonly used polymers: polysulfone and poly (vinylidene fluoride). Five different methods for membrane fabrication are introduced: non-solvent induced phase separation, vapor-induced phase separation, electrospinning, track etching and sintering. The key factors of each method are discussed, including the solvent and non-solvent system type and composition, the polymer solution composition and concentration, the processing parameters, and the ambient conditions. To evaluate these methods, a brief description on membrane characterization is given related to morphology and performance. One objective of this review is to present the basics for selecting an appropriate method and membrane fabrication systems with appropriate processing conditions to produce membranes with the desired morphology, performance and stability, as well as to select the best methods to determine these properties.

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Section: Methods Of Preparationmentioning

confidence: 99%

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

2019

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“…Thus, the values ΔH m,D and ΔH f,D can be a factor in determining the polymer influence on the pure solvent. Equations (2) and (3) show the calculation methods of ΔH f,D and ΔH m,D, respectively. At the T f of the pure solvent, a freezing enthalpy change value of − 122 J/g was used, similar to the literature value, and at the T m of the pure solvent, an experimental enthalpy change value of 128 J/g was used.…”

Section: Results Phase Change Behavior Of Solventsmentioning

confidence: 99%

“…A single polymer chain is usually in a coil form in solution due to balanced interactions with the solvent and the polymer itself 1 . Molecular interactions with solvents and polymers have typical properties that can be applied to many industrial processes, and they play important roles in applications, such as membrane casting and formation [2][3][4][5][6] , battery separator preparation [7][8][9] , and polymer synthesis 10,11 , as well as in determining solubility parameters [12][13][14][15] . Recently, a 30 wt% polystyrene (PS) solution in dimethylformamide (DMF) was studied in an ultralow temperature region by Samitsu et al 16 .…”

mentioning

confidence: 99%

Novel behavior in a polymer solution: the disappearance of the melting temperature (Tm) and enthalpy change (ΔHm) of the solvent

Kim

Park

Cheon

et al. 2020

Sci Rep

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The phase change temperature and enthalpy change as a function of polystyrene (PS) concentration in dimethylformamide through a dynamic heating and quenching process were investigated. Cold crystallization, freezing and melting phenomena in a 10 wt% PS solution were all observed. Cold crystallization and melting phenomena were still observed in a 20 wt% solution. In a 30 wt% solution, all three phenomena disappeared without any solvent enthalpy changes, e.g., enthalpy changes at the melting temperature. The disappearance of both the melting temperature and the melting enthalpy change indicated that all polymer and solvent molecules in the 30 wt% solution existed only in the amorphous phase without any phase changes despite repeated heating and quenching processes. Thus, our results can provide a new approach for gelation through enthalpy changes and can be applied in the fabrication of porous membranes with a narrow distribution.

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“…The cellulose acetate (CA) membrane used for NF application demonstrated MgCl 2 rejection of 93.2 ±-4.7% which is competitive with current NF membranes across all applications. Zhao, Chong, Shi, and Wang (2019) investigated the combination of NIPS and thermally induced-phase separation to develop membranes with tailorable surface pore structure, by fabricating novel (PVDF hollow fiber membrane with tunable surface pore structure. Test results showed that the water permeability increased from 389 ± 30 to 922 ± 36 L m −2 h −1 bar −1 , with overall porosity improvement from 50 ± 2.2 to 69 ± 2.9%, and formation of piezoelectric β-phase crystals on the membrane which may be used in electrochemical separation process.…”

Section: Annual Literature Reviewmentioning

confidence: 99%

“…Anionic polyacrylamide (APAM) is a flocculation polymer frequently used in industrial wastewaters. Since NF is commonly used in wastewater reclamation, Zhao et al (2019) conducted an investigation on NF membrane fouling due to APAM. They found that higher MW APAM was associated with more severe fouling, and that calcium ion and carboxylates also influenced fouling.…”

Section: Fouling Measurement and Characterizationmentioning

confidence: 99%

Membrane processes

Arabi¹,

Pellegrin

Aguinaldo

et al. 2020

Water Environment Research

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This literature review provides a review for publications in 2018 and 2019 and includes information membrane processes findings for municipal and industrial applications. This review is a subsection of the annual Water Environment Federation literature review for Treatment Systems section. The following topics are covered in this literature review: industrial wastewater and membrane. Bioreactor (MBR) configuration, membrane fouling, design, reuse, nutrient removal, operation, anaerobic membrane systems, microconstituents removal, membrane technology advances, and modeling. Other subsections of the Treatment Systems section that might relate to this literature review include the following: Biological Fixed-Film Systems, Activated Sludge, and Other Aerobic Suspended Culture Processes, Anaerobic Processes, and Water Reclamation and Reuse. This publication might also have related information on membrane processes: Industrial Wastes, Hazardous Wastes, and Fate and Effects of Pollutants.

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Explorations of combined nonsolvent and thermally induced phase separation (N-TIPS) method for fabricating novel PVDF hollow fiber membranes using mixed diluents

Cited by 60 publications

References 70 publications

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

A Review on Porous Polymeric Membrane Preparation. Part I: Production Techniques with Polysulfone and Poly (Vinylidene Fluoride)

Novel behavior in a polymer solution: the disappearance of the melting temperature (Tm) and enthalpy change (ΔHm) of the solvent

Membrane processes

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