Phase separation phenomena in solutions of polysulfone in mixtures of a solvent and a nonsolvent: relationship with membrane formation

Wijmans, J.G.; Kant, J.; Mulder, M.H.V.; Smolders, C.A.

doi:10.1016/0032-3861(85)90090-4

Cited by 200 publications

(145 citation statements)

References 8 publications

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“…It has been hypothesized that the denser skin layer and the more porous sublayer are formed by two separate mechanisms [23]. For the top skin layer, the structure is primarily determined by the order of events during phase separation [37].…”

Section: Role Of Solvent-polymer Interactionmentioning

confidence: 99%

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Relating performance of thin-film composite forward osmosis membranes to support layer formation and structure

Tiraferri¹,

Yip²,

Phillip³

et al. 2011

Journal of Membrane Science

572

404

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Osmotically-driven membrane processes have the potential to treat impaired water sources, desalinate sea/brackish waters, and sustainably produce energy. The development of a membrane tailored for these processes is essential to advancing the technology to the point that it is commercially viable. Here, a systematic investigation of the influence of thin-film composite membrane support layer structure on forward osmosis performance is conducted. The membranes consist of a selective polyamide active layer formed by interfacial polymerization on top of a polysulfone support layer fabricated by phase separation. By systematically varying the conditions used during the casting of the polysulfone layer, an array of support layers with differing structures were produced. The role that solvent quality, dope polymer concentration, fabric layer wetting, and casting blade gate height play in the support layer structure formation was investigated. Using a 1 M NaCl draw solution and a deionized water feed, water fluxes ranging from 4 to around 25 L m -2 h -1 with consistently high salt rejection (>95.5%) were produced. The relationship between membrane structure and performance was analyzed. This study confirms the hypothesis that the optimal forward osmosis membrane consists of a mixedstructure support layer, where a thin sponge-like layer sits on top of highly porous macrovoids.Both the active layer transport properties and the support layer structural characteristics need to be optimized in order to fabricate a high performance forward osmosis membrane.

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Section: Role Of Solvent-polymer Interactionmentioning

confidence: 99%

“…The solutions were stirred while pure nonsolvent (DI water) was added until the polymer solution became irreversibly turbid as determined by visual detection. The cloud point was calculated as the mass ratio of nonsolvent to total polymer solution plus the nonsolvent [23].…”

Section: Determination Of the Cloud Pointmentioning

confidence: 99%

Relating performance of thin-film composite forward osmosis membranes to support layer formation and structure

Tiraferri¹,

Yip²,

Phillip³

et al. 2011

Journal of Membrane Science

572

404

View full text Add to dashboard Cite

show abstract

“…They found that the increase of CBT causes the formation of macrovoids and a more porous structure. The coagulation medium is another important synthesis parameter which can exert drastic effects on the resulting structures of membranes made by phase inversion processes (Banks and Sharples, 1966;Saler et al, 1974;Strathmann, 1985;Mulder et al, 1985;Wijmans et al, 1985;Bottmo et al, 1985).…”

Section: Introductionmentioning

confidence: 99%

Modification of PSf membrane nanostructure using different fabrication parameters and investigation of the CO2 separation properties of PDMS-coated PSf composite membranes

Pakizeh

Mansoori

Chenar

et al. 2013

Braz. J. Chem. Eng.

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-The effects of preparation parameters on the performance and morphology of polydimethylsiloxane/ polysulfone (PDMS/PSf) membranes were investigated. The PDMS layer is mainly used for sealing the defects of the PSf selective layer. The membrane morphologies were characterized by using scanning electron microscopy (SEM). The CO 2 /CH 4 separation performance of membranes was studied by a pure gas permeation experimental set up. According to the SEM results, decreasing the water/N,N-dimethylacetamide (DMAc) ratio as the coagulation medium from pure water to mixture of 90 vol.% DMAc and 10 vol.% water resulted in complete disappearance of macrovoids and also a lowering of the membrane selectivity. Permselectivity results showed that the ideal CO 2 /CH 4 separation factor of the membranes was improved by the presence of the non-solvent additive to the polymer solution. It was also observed that reduction of the coagulation bath temperature (CBT) led to elimination of macrovoids which affect gas separation performance. Using methanol as a coagulant resulted in a less selective membrane compared with ethanol and water as coagulants and the CO 2 permeance was about 3 and 9 times greater than with ethanol and water as coagulants, respectively.

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“…Polysulfone (PSF) and polyethersulfone (PES) have been used by many researchers [1][2][3][4][5][6][7] in the preparation of hollow fiber membranes as membrane forming normally a homogeneous solution, which is forced to phase separate by changing its composition when immersed in a nonsolvent bath. Kinetic processes play a key role in this transition.…”

Section: Introductionmentioning

confidence: 99%

Characterization of morphology controlled polyethersulfone hollow fiber membranes by the addition of polyethylene glycol to the dope and bore liquid solution

Liu

Koops

Strathmann

2003

Journal of Membrane Science

235

118

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Phase separation phenomena in solutions of polysulfone in mixtures of a solvent and a nonsolvent: relationship with membrane formation

Cited by 200 publications

References 8 publications

Relating performance of thin-film composite forward osmosis membranes to support layer formation and structure

Relating performance of thin-film composite forward osmosis membranes to support layer formation and structure

Modification of PSf membrane nanostructure using different fabrication parameters and investigation of the CO2 separation properties of PDMS-coated PSf composite membranes

Characterization of morphology controlled polyethersulfone hollow fiber membranes by the addition of polyethylene glycol to the dope and bore liquid solution

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