Preparation and hydrophilicity study of poly(vinyl butyral)-based ultrafiltration membranes

Shen, Fanxia; Lu, Xin; Bian, Xiaokai; Liuqing, Shi

doi:10.1016/j.memsci.2005.05.001

Cited by 56 publications

(25 citation statements)

References 27 publications

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“…The shape of macrovoid pores in membranes formed from NMP, DMSO and DMF as a solvent indicates that the formation rate of macrovoids in the sublayer of membranes is the highest for NMP and DMF and almost identical. The top active porous thinner layer and big macrovoid pores build the membrane formed from DMSO as solvent at 85 % have a higher water flux and a lower retention of metal ions, which is consistent with the study of Shen et al [20]..…”

Section: Membrane Hydraulic Resistance (Mhr)supporting

confidence: 91%

“…A very good correlation was found between the pure water fluxes of all membranes with solvents and the pore formation on surface. Shen et al [20] reported the significance of the solvent-nonsolvent diffusivity for various systems such as NMP, DMAC and DMF. On the other hand, we found that the rate of the phase separation at a higher polymer concentration (17.5% of PES) determines the formation of denser and less porous top surface structures than those obtained at 15% of PES, that is, at a lower polymer concentration.…”

Section: Membrane Hydraulic Resistance (Mhr)mentioning

confidence: 99%

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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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Section: Membrane Hydraulic Resistance (Mhr)supporting

confidence: 91%

Section: Membrane Hydraulic Resistance (Mhr)mentioning

confidence: 99%

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

2011

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“…A similar observation has also been reported elsewhere [19] for polyether-polyamide blend membranes. According to Shen et al [20] , the solvent dissolution power for membrane formation ranked NMP > DMAc > DMF > DMSO. The rate of polymer precipita tion became slower from cloud point data for the ternary polymer-solvent-water systems, as Brought to you by | Carleton University OCUL Authenticated Download Date | 6/19/15 8:58 AM the mutual diffusion rate of the DMF-water or DMAc-water was relatively slower, which resulted in a slower rate of the creation of a new nucleus.…”

Section: Pure Water Fl Ux and Equilibrium Water Contentmentioning

confidence: 99%

Performance enhancement of polysulfone ultrafiltration membrane by blending with polyurethane hydrophilic polymer

Arthanareeswaran

Velu

Loganathan

2011

Journal of Polymer Engineering

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The aim of this work was to study the effect of two solvents such as N , N ′ -dimethylformamide (DMF) and dimethylacetamide (DMAc) used in the production of polysulfone (PSf) and polyurethane (PU) blend ultrafi ltration membranes, infl uence permeability and selectivity. PSf/PU membranes were prepared by the phase inversion method using polymer concentrations of 100/0, 20/80 and 0/100 wt % . Permeation performance of the prepared membranes was evaluated in terms of pure water fl ux, water content and hydraulic resistance. It was found that the membrane composed of 20/80 wt % of PSf/PU in the presence of DMAc showed a water fl ux of 60.5 l m -2 h -1 under transmembrane pressure of 345 kPa, and the water fl ux of 23.5 l m -2 h -1 for 20/80 wt % of PSf/PU in the presence of DMF. With increasing the polarity of DMAc in the casting solution, an increase in porous layer thickness was observed, and then a good water fl ux of membranes can be obtained. It was found that the polar solvent caused the rapidly demixing of casting solution in coagulation bath and formed porous asymmetric membranes with defective skin layer. The permeation rates of proteins were measured with different molecular weights of the proteins.

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“…[1][2][3][4][5][6][7][8] In the NIPS process, a homogeneous polymer solution is cast as a thin film or a hollow fiber shape, and then immersed into a nonsolvent coagulation bath. The diffusional exchange of solvent and nonsolvent across the interface between casting solution and nonsolvent can make the casting solution phase separate to form a membrane with a symmetric or asymmetric structure.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13][14] It has been reported that PVB had been used to prepare affinity membranes. 15 Shen et al 8 and Jiang and coworkers 16 prepared PVB ultrafiltration membranes via NIPS. However, PVB is still a new material in the membrane preparation field and there are only a few papers on PVB membrane preparation.…”

Section: Introductionmentioning

confidence: 99%

Structure control of asymmetric poly(vinyl butyral)‐TiO₂ composite membrane prepared by nonsolvent induced phase separation

Matsuyama

Nagai³

2008

J of Applied Polymer Sci

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Poly(vinyl butyral) (PVB)-TiO 2 composite hollow fiber membranes were prepared via nonsolvent induced phase separation (NIPS). The membrane had a skin layer on both the outer and inner surface at the initial stage after membrane preparation. However, the outer surface became porous with the passage of time, as the polymer in the membrane's outer surface was decomposed by the photocatalysis of TiO 2 . The initial water permeability increased with the increase of TiO 2 content. Furthermore, for all the membranes, as time elapsed the water permeabilities increased and became constant after about 15 days, which was in accordance with the alteration on the membrane's outer surface. Despite decomposition of the polymer on the outer surface, particle rejection hardly changed because the inner surface kept the original structure. Thus, addition of TiO 2 to the membrane is a useful way to improve water permeability while maintaining particle rejection. The clear asymmetric structure with both porous structure at the outer surface and skin layer at the inner surface was achieved by the addition of TiO 2 . Therefore, the addition of TiO 2 is a new method for achieving the high porosity at the outer surface of the hollow fiber membrane. In addition, tensile strength and elasticity kept constant over time and were higher than those of original PVB membranes.

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Preparation and hydrophilicity study of poly(vinyl butyral)-based ultrafiltration membranes

Cited by 56 publications

References 27 publications

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

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

Performance enhancement of polysulfone ultrafiltration membrane by blending with polyurethane hydrophilic polymer

Structure control of asymmetric poly(vinyl butyral)‐TiO₂ composite membrane prepared by nonsolvent induced phase separation

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Preparation and hydrophilicity study of poly(vinyl butyral)-based ultrafiltration membranes

Cited by 56 publications

References 27 publications

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

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

Performance enhancement of polysulfone ultrafiltration membrane by blending with polyurethane hydrophilic polymer

Structure control of asymmetric poly(vinyl butyral)‐TiO2 composite membrane prepared by nonsolvent induced phase separation

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Structure control of asymmetric poly(vinyl butyral)‐TiO₂ composite membrane prepared by nonsolvent induced phase separation