The Effect of Polyethersulfone Concentration on Flat and Hollow Fiber Membrane Performance

Wood, H.W.; Wang, J.; Sourirajan, S.

doi:10.1080/01496399308019740

Cited by 22 publications

(12 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Above this critical concentration, polymer-polymer entanglements are so intense that a small addition of polymer to the solution causes a large viscosity increase. This same critical polymer concentration was found by Wood et al (18). Above this critical concentration, the mobility of the macromolecules is lowered considerably.…”

Section: Effects Of Psf Concentrationsupporting

confidence: 66%

See 1 more Smart Citation

Effect of Internal Coagulant on Morphology of Polysulfone Hollow Fiber Membranes. I

Yan¹,

Lau²

1998

Separation Science and Technology

View full text Add to dashboard Cite

Membrane separation performance is governed by membrane morphology. It is generally accepted that structure of the membrane skin layer is responsible for membrane selectivity while membrane flux depends on the total transmembrane resistance to material flow. In this study, polysulfone ultrafiltration hollow fiber membranes were made using the "dry-wet" fiber spinning process through a tubein-orifice spinnerette. By using water as the external coagulant and a very short air gap, fibers with a dense outer skin layer were prepared which showed high selectivity in the separation of polyethylene glycols of various molecular weight. By using a mixture of water and l-methyl-2-pyrrolidone in various proportions as the internal coagulant, demixing rates of the polymer in the spinning solution could be adjusted to yield a more open surface structure in the fiber inner surface layer and a more porous sublayer in the fiber wall to reduce the total transmembrane resistance. The rate of polymer demixing can be related to the difference between the solubility parameter of the internal coagulant and that of the polymer. This difference can serve as a scale to indicate the coagulation power of the internal coagulant. At low coagulation power, fibers with a more open structure in the fiber wall and its inner surface could be made which yielded higher membrane flux due to the lower transmembrane resistance in these fibers.

show abstract

Section: Effects Of Psf Concentrationsupporting

confidence: 66%

“…The critical number of main chain atoms Z c for strong polymer-polymer entanglement is 600 (17). Z of commercially available PSF is about 3000 [estimated from polyethersulfone (18)]. As shown in Fig.…”

Section: Effects Of Psf Concentrationmentioning

confidence: 99%

Effect of Internal Coagulant on Morphology of Polysulfone Hollow Fiber Membranes. I

Yan¹,

Lau²

1998

Separation Science and Technology

View full text Add to dashboard Cite

show abstract

“…The kinetics of membrane formation can be controlled by temperature of coagulation bath [24]. The parameters such as polymer concentration [26], solvent [27], coagulation bath [28], conditions for preparation [29], polymer solution temperature, air moisture, and evaporation time before the wet phase have significant impact on the morphology and properties of the prepared membranes [30]. A change in one or more parameter leads to a change in the properties of the membrane as discussed elsewhere [31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Polymer Concentration and Solvent Variation Correlation with the Morphology and Water Filtration Analysis of Polyether Sulfone Microfiltration Membrane

Alvi¹,

Khalid²,

Ahmad

et al. 2019

Advances in Polymer Technology

View full text Add to dashboard Cite

Microfiltration flat sheet membranes of polyether sulfone (PES) were fabricated by incorporating varying concentrations of polymer and investigated the influence of substituting solvents. The membranes were prepared via immersion precipitation method. Different solvents that included NMP (N-methyl-2-pyrrolidone), DMF (dimethylformamide), and THF (tetrahydrofuran) were used to analyse their effect on the performance and morphology of the prepared membranes. Two different coagulation bath temperatures were used to investigate the kinetics of membrane formation and subsequent effect on membrane performance. The maximum water flux of 141 ml/cm2.h was observed using 21% of PES concentration in NMP + THF cosolvent system. The highest tensile strength of 29.15 MPa was observed using membrane prepared with 21% PES concentration in NMP as solvent and coagulation bath temperature of 25°C. The highest hydraulic membrane resistance was reported for membrane prepared with 21% PES concentration in NMP as solvent. Moreover, the lowest contact angle of 67° was observed for membrane prepared with 15% of PES concentration in NMP as solvent with coagulation bath temperature of 28°C. Furthermore, the Hansen solubility parameter was used to study the effect on the thermodynamics of membrane formation and found to be in good correlation with experimental observation and approach in the present work.

show abstract

“…This suggests a reduction in hollow fiber surface area when exiting the spinneret due to suppression and extrusion shear at spinneret wall and elongation from gravity at dry gap. However, as shown in Table 2, the thickness ratio of the fabricated membranes was nearly equal to 0.5, which has been considered as good hollow fiber membrane strength properties [18].…”

Section: Influence Of Polymer Formulation On the Membrane Morphologymentioning

confidence: 96%

Influence of Surface Modifying Macromolecules (SMMs) on Polyethersulfone Hollow Fiber Membranes for Water Separations

Bolong

Ismail

Salim

et al. 2017

AMST

View full text Add to dashboard Cite

The objective of this work is to modify the polyethersulfone (PES) hollow fiber membranes by blending with Surface Modifying Macromolecules (SMMs) which were able to introduce charges at the membrane surface. To study the effects of SMMs, PES solutions with and without blending SMMs were spun by the dry–wet phase inversion method. The membranes were characterized by ionic solutes permeation and Field Emission Scanning Electron Microscopy (FESEM). There was no significant difference in the membrane morphology between the membranes with and without SMM blending, indicating that the morphology of the base polymer remained relatively unchanged. However, based on Energy Dispersive X–ray (EDX) analysis, the presence of SMM’s elements at the surface of the SMM blended membranes was detected. The pure water permeation rates were found two times increased with the existence of SMMs, while rejection towards ionic solutes remained relatively unchanged.

show abstract

The Effect of Polyethersulfone Concentration on Flat and Hollow Fiber Membrane Performance

Cited by 22 publications

References 14 publications

Effect of Internal Coagulant on Morphology of Polysulfone Hollow Fiber Membranes. I

Effect of Internal Coagulant on Morphology of Polysulfone Hollow Fiber Membranes. I

Polymer Concentration and Solvent Variation Correlation with the Morphology and Water Filtration Analysis of Polyether Sulfone Microfiltration Membrane

Influence of Surface Modifying Macromolecules (SMMs) on Polyethersulfone Hollow Fiber Membranes for Water Separations

Contact Info

Product

Resources

About