Tuning morphology and transport in ultrafiltration membranes derived from polyethersulfone through exploration of dope formulation and characteristics

Alibakhshi, Somayeh; Youssefi, Mostafa; Hosseini, Seyed Saeid; Ali, Zulfiqar

doi:10.1088/2053-1591/ab56c3

Cited by 25 publications

(18 citation statements)

References 66 publications

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Section: Introductionmentioning

confidence: 99%

“…The nonsolvent‐induced phase separation (NIPS) is widely used to prepare membranes and uses large amounts of solvents, [66] generally toxic polar aprotic solvents such as NMP, DMAc and DMF. [ 64 , 67 , 68 ] Therefore, membrane technology attracts increased attention in greener solvents more every year. Sustainable membranes were previously prepared using Cyrene; the viscosity of Cyrene was allowed for and a new method of casting the film from a hot casting gel (70 °C), allowing to tailor membranes to fit a wide range of filtration systems having different physical properties.…”

Section: Introductionmentioning

confidence: 99%

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Polymer Chemistry Applications of Cyrene and its Derivative Cygnet 0.0 as Safer Replacements for Polar Aprotic Solvents

et al. 2021

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This study explores a binary solvent system composed of biobased Cyrene and its derivative Cygnet 0.0 for application in membrane technology and in biocatalytic synthesis of polyesters. Cygnet‐Cyrene blends could represent viable replacements for toxic polar aprotic solvents. The use of a 50 wt % Cygnet‐Cyrene mixture makes a practical difference in the production of flat sheet membranes by nonsolvent‐induced phase separation. New polymeric membranes from cellulose acetate, polysulfone, and polyimide are manufactured by using Cyrene, Cygnet 0.0, and their blend. The resultant membranes have different morphology when the solvent/mixture and temperature of the casting solution change. Moreover, Cyrene, Cygnet 0.0, and Cygnet‐Cyrene are also explored for substituting diphenyl ether for the biocatalytic synthesis of polyesters. The results indicate that Cygnet 0.0 is a very promising candidate for the enzymatic synthesis of high molecular weight polyesters.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Polymer Chemistry Applications of Cyrene and its Derivative Cygnet 0.0 as Safer Replacements for Polar Aprotic Solvents

et al. 2021

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“…In the NIPS method, the membrane formation is influenced by three essential parameters: (1) the solvent, (2) the non-solvent, and (3) the polymer. Therefore, determining an optimal polymer concentration and an appropriate solvent can be highly crucial for improving the membrane morphology and performance [42]. The cloud point for each dope solution was measured via titration by the non-solvent based on the transformation of the solutions into turbidity [43,44].…”

Section: Cloud Point Measurementsmentioning

confidence: 99%

Tailoring the Morphology and Performance of Polyacrylonitrile Ultrafiltration Membranes for Produced Water Treatment via Solvent Mixture Strategy

2022

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The separation performance of membranes is highly dependent on their morphology and microstructure. The present study aims to tailor the characteristics of asymmetric polyacrylonitrile (PAN) ultrafiltration membranes by adopting a solvent mixture strategy, combining dimethylformamide (DMF) and N‐methyl‐2‐pyrrolidone (NMP) for produced water treatment. The ternary phase diagram was used for better analysis of the microstructural changes from the thermodynamics point of view. Using a solvent mixture containing more DMF (i.e., 75 %) and increasing the PAN concentration in the dope were effective in improving the solution viscosity and promoting delayed demixing. As a result, finger‐like macrovoids were suppressed to some extent and the internal morphology of the membranes was transformed into a sponge‐like structure, accompanied by a reduction in the overall membrane porosity and mean pore size.

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“…In continuation of our research investigations on the characterization of PES membranes, [ 30 ] this study aims to investigate the influence of solvent type and PES concentration on the thermodynamics and rheological characteristics of PES/NMP and PES/DMF dope solution systems. Viscoelastic behavior was determined to evaluate the solvent power.…”

Section: Introductionmentioning

confidence: 99%

Significance of thermodynamics and rheological characteristics of dope solutions on the morphological evolution of polyethersulfone ultrafiltration membranes

Alibakhshi

Youssefi

Hosseini

et al. 2020

Polymer Engineering & Sci

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Herein, the effect of solvent type and polymer concentration on the thermodynamic and viscoelastic properties, and performance of polyethersulfone (PES) ultrafiltration (UF) membranes are investigated. The morphology and mechanical properties of the membranes are examined too. Rheological measurements indicated that solidification and instantaneous demixing occurred fast for PES/N‐methyl‐2‐pyrrolidone (NMP) dope solution. This resulted in a dense skin layer with a finger‐like structure confirmed by the scanning electron microscopy images. In comparison, PES/dimethylformamide (DMF) exhibited a delayed solidification and demixing with a sponge‐like structure. Rheological characteristics and ternary phase diagrams of two systems are examined to gain insights and make correlations with the morphology of resultant membranes. Performance analysis revealed that membranes derived from PES/NMP system exhibited both improved pure water flux and bovine serum albumin rejection suggesting the superiority of NMP compared to DMF as the solvent of choice for the preparation of PES UF membranes.

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Tuning morphology and transport in ultrafiltration membranes derived from polyethersulfone through exploration of dope formulation and characteristics

Cited by 25 publications

References 66 publications

Polymer Chemistry Applications of Cyrene and its Derivative Cygnet 0.0 as Safer Replacements for Polar Aprotic Solvents

Polymer Chemistry Applications of Cyrene and its Derivative Cygnet 0.0 as Safer Replacements for Polar Aprotic Solvents

Tailoring the Morphology and Performance of Polyacrylonitrile Ultrafiltration Membranes for Produced Water Treatment via Solvent Mixture Strategy

Significance of thermodynamics and rheological characteristics of dope solutions on the morphological evolution of polyethersulfone ultrafiltration membranes

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