Influence of Co‐Solvent Concentration on the Properties of Dope Solution and Performance of Polyethersulfone Membranes

Ahmed, Iqbal; Idris, Ani; Hussain, Ahmad; Yusof, Zainal Abidin Mohd; Khan, Muhammad Saad

doi:10.1002/ceat.201300235

Cited by 17 publications

(14 citation statements)

References 12 publications

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“…The phase separation behavior of the polymer solution plays an important role in determining the morphological structure of membranes fabricated by nonsolvent induced phase separation i.e., the immersion precipitation method. Further, the solution properties such as intrinsic viscosities, refractive index, and density affect the interaction parameters which in turn influence the phase separation behavior [ 29 ]. Most importantly, during the preparation of asymmetric membranes, determination of appropriate polymer concentrations becomes important prior to the development of the membrane.…”

Section: Resultsmentioning

confidence: 99%

Effects of Phase Separation Behavior on Morphology and Performance of Polycarbonate Membranes

et al. 2017

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The phase separation behavior of bisphenol-A-polycarbonate (PC), dissolved in N-methyl-2-pyrrolidone and dichloromethane solvents in coagulant water, was studied by the cloud point method. The respective cloud point data were determined by titration against water at room temperature and the characteristic binodal curves for the ternary systems were plotted. Further, the physical properties such as viscosity, refractive index, and density of the solution were measured. The critical polymer concentrations were determined from the viscosity measurements. PC/NMP and PC/DCM membranes were fabricated by the dry-wet phase inversion technique and characterized for their morphology, structure, and thermal stability using field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis, respectively. The membranes’ performances were tested for their permeance to CO2, CH4, and N2 gases at 24 ± 0.5 °C with varying feed pressures from 2 to 10 bar. The PC/DCM membranes appeared to be asymmetric dense membrane types with appreciable thermal stability, whereas the PC/NMP membranes were observed to be asymmetric with porous structures exhibiting 4.18% and 9.17% decrease in the initial and maximum degradation temperatures, respectively. The ideal CO2/N2 and CO2/CH4 selectivities of the PC/NMP membrane decreased with the increase in feed pressures, while for the PC/DCM membrane, the average ideal CO2/N2 and CO2/CH4 selectivities were found to be 25.1 ± 0.8 and 21.1 ± 0.6, respectively. Therefore, the PC/DCM membranes with dense morphologies are appropriate for gas separation applications.

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Section: Resultsmentioning

confidence: 99%

Effects of Phase Separation Behavior on Morphology and Performance of Polycarbonate Membranes

et al. 2017

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“…This significant change in morphology directly affected the performance of the membrane, with PEG 600 removal maintaining a constant value of up to 83% [25]. Acetone which is a highly volatile solvent used together with low volatile solvent results in membranes with slightly lower permeation coupled with excellent rejection rates as shown by Ahmed et al [27]. By applying a similar concept, NMP can be used with acetone to create a membrane with similar morphology hence create a similar effect for the performance of the membrane.…”

Section: Introductionmentioning

confidence: 99%

Antifouling Properties of PES Membranes by Blending with ZnO Nanoparticles and NMP–Acetone Mixture as Solvent

2018

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In this study, the antifouling properties of polyethersulfone (PES) membranes blended with different amounts of ZnO nanoparticles and a fixed ratio of N-methyl-2-pyrrolidone (NMP)-acetone mixture as a solvent were investigated. The properties and performance of the fabricated membranes were examined in terms of hydrophilicity, porosity, pore size, surface and cross-section image using scanning electron microscopy (SEM), surface roughness using atomic force microscopy (AFM), pure water flux, and humic acid filtration. Addition of ZnO as expected was found to improve the hydrophilicity as well as to encourage pore formation. However, the agglomeration of ZnO at a higher concentration cannot be avoided even when dissolved in a mixed solvent. The presence of highly volatile acetone contributed to the tight skin layer of the membrane which shows remarkable antifouling ability with the highest flux recovery ratio and negligible irreversible fouling. ZnO NPs in acetone/NMP mixed solvent shows an improvement in flux and rejection, but, the fouling resistance was moderate compared to the pristine membrane.

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“…Study of the membrane characteristics by using different solvents has also attempted either to induce solubility for some additives or to alter the membrane properties 12–14 . A few studies have reported a significant improvement in membrane properties by introducing a co‐solvent/nonsolvent into the casting solution 15–17 . It is well established that polymers exhibit different properties in binary solvent mixtures.…”

Section: Introductionmentioning

confidence: 99%

“…Ahmed et al . have reported the use of acetone as co‐solvent and its effect on membrane morphology and performance for polyethersulfone membranes 17 . They varied the acetone percentage in a narrow range between 20 and 25 wt% and correlated acetone concentration with membrane properties.…”

Section: Introductionmentioning

confidence: 99%

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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Influence of Co‐Solvent Concentration on the Properties of Dope Solution and Performance of Polyethersulfone Membranes

Cited by 17 publications

References 12 publications

Effects of Phase Separation Behavior on Morphology and Performance of Polycarbonate Membranes

Effects of Phase Separation Behavior on Morphology and Performance of Polycarbonate Membranes

Antifouling Properties of PES Membranes by Blending with ZnO Nanoparticles and NMP–Acetone Mixture as Solvent

Effect of mixed solvents on phase inversion of polymeric membranes

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