Phase separation processes in polymer solutions in relation to membrane formation

Witte, P. van de; Dijkstra, Pieter J.; Berg, J.W.A. van den; Feijén, Jan

doi:10.1016/0376-7388(96)00088-9

Cited by 1,225 publications

(649 citation statements)

References 141 publications

(286 reference statements)

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“…Flat sheet polysulfone-based membranes were prepared by phase inversion method via immersion precipitation in water coagulation bath as reported in literature [27][28][29] . Several polysulfone solutions were prepared by dissolving a measured amount of polymer (16 wt %) in NMP at room temperature.…”

Section: Membrane Preparationmentioning

confidence: 99%

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

et al. 2017

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Polymer solutions of polysulfone (PSf) and methylcellulose (MC) in 1-methyl-2-pyrrolidone (NMP) were used to prepare ultrafiltration membranes by the phase inversion technique via immersion precipitation. The effect of MC additive on the structure and performances of the membranes was studied. The obtained membranes were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), infrared spectroscopy (FTIR-ATR), equilibrium water content (EWC), water contact angle, porosity and ultrafiltration experiments of polyethylene glycol solutions. It was found that all the PSf/MC membranes had higher porosity, more hydrophilic surface and more vertically finger like pores than PSf membrane. With an increase in MC content in the casting solution from 0.5% to 1.5%, the hydraulic permeability increases from 17.17 to 118.46 L.m -2 .h -1 .bar -1 , while the rejection decreases from 91.82% to 64.45% with PEG 35000. DSC scan and FTIR analysis confirmed that methylcellulose was trapped in the membranes matrix.

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Section: Membrane Preparationmentioning

confidence: 99%

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

et al. 2017

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“…Membranes of a various pore structure were formed by dry and wet phase inversion in non solvent coagulation bath, which is the most common method of two layer membrane (asymmetric) formation [1][2][3]. A thin film of a homogenous polymer casting solutions was deposited on a glass substrate, then evaporation of the solvent took place for a short period of time and then immersion into a nonsolvent coagulation bath was used.…”

Section: Introductionmentioning

confidence: 99%

Effect of solvents on performance of polyethersulfone ultrafiltration membranes: Investigation of metal ion separations

2011

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Citation: ARTHANAREESWARAN, G. and STAROV, V., 2010 ABSTRACTThe new polyethersulfone (PES) based ultrafiltration membranes were formed using two stage process of dry and wet phase inversion in non solvent coagulation bath. The effects of three different solvents such as, N-N dimethylformamide (DMF) , N-methyl-2-pyrrolidone (NMP) and Dimethyl sulphoxide (DMSO) of 82.5% and 85% concentrations on the performance of final membranes were extensively investigated. Experimental results proved that PES ultrafiltration membranes with an asymmetric structure were successfully formed which was confirmed by scanning electron microscopy (SEM). The number of pores formed on the top layer of PES membranes using above-mentioned three solvents was the result of the combined effect of the thermodynamic properties of the system (composition, concentrations, phase behaviour) and membrane formation kinetics, whereas, the formation of the macroporous sub layer of those membranes was controlled by the diffusion rate of solvent-nonsolvent. The flux of pure water, membrane resistance, mechanical stability and separation performance of the PES membranes can be varied using different PES concentrations. Separation of metal ions from aqueous solutions was studied for Ni (II), Cu (II) and Cr (III) using two complexing polymer ligands:Polyvinyl alcohol (PVA) and poly(diallyldimethylammonium chloride) (PDDA).The separation and permeate rate (flux) efficiencies of the new membranes are compared using different solvents and different PES/solvents compositions.

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“…8,[16][17][18] During gelation, several connections between polymeric chains occur, forming a three-dimensional network that becomes the dense layer later in the process. CIPS is the first technique to use chemical associations instead of physical associations to form the dense top layer of asymmetric membranes prepared via phase inversion.…”

mentioning

confidence: 99%

Complexation-Induced Phase Separation: Preparation of Composite Membranes with a Nanometer-Thin Dense Skin Loaded with Metal Ions

2015

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We present the development of a facile phaseinversion method for forming asymmetric membranes with a precise high metal ion loading capacity in only the dense layer. The approach combines the use of macromolecule-metal intermolecular complexes to form the dense layer of asymmetric membranes with nonsolvent-induced phase separation to form the porous support. This allows the independent optimization of both the dense layer and porous support while maintaining the simplicity of a phase-inversion process. Moreover, it facilitates control over (i) the thickness of the dense layer throughout several orders of magnitude from less than 15 nm to more than 6 μm, (ii) the type and amount of metal ions loaded in the dense layer, (iii) the morphology of the membrane surface, and (iv) the porosity and structure of the support. This simple and scalable process provides a new platform for building multifunctional membranes with a high loading of well-dispersed metal ions in the dense layer.

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Phase separation processes in polymer solutions in relation to membrane formation

Cited by 1,225 publications

References 141 publications

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

Effects of Methylcellulose on the Properties and Morphology of Polysulfone Membranes Prepared by Phase Inversion

Effect of solvents on performance of polyethersulfone ultrafiltration membranes: Investigation of metal ion separations

Complexation-Induced Phase Separation: Preparation of Composite Membranes with a Nanometer-Thin Dense Skin Loaded with Metal Ions

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