A Facile Method to Prepare Double-Layer Isoporous Hollow Fiber Membrane by In Situ Hydrogen Bond Formation in the Spinning Line

Noor, Nazia; Koll, Joachim; Radjabian, Maryam; Abetz, Clarissa; Abetz, Volker

doi:10.1002/marc.201500593

Cited by 19 publications

(13 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Associating sulfonated polymers as one of the blend components in the membrane-forming solutions has been studied to increase hydrophilicity, to lower the fouling in ultrafiltration and nanofiltration membranes, and as the support layer for thin film composite membranes for forward osmosis [ 1 , 6 , 7 , 8 ]. Sulfonated polymers were reported as a support layer material to facilitate water transport or improve the interfacial adhesion in composite membranes [ 9 , 10 ] as well. Generally, the degree of sulfonation and the concentration of the sulfonated polymer in the dope solution affects the performance of a membrane [ 11 ].…”

Section: Introductionmentioning

confidence: 99%

Hollow Fiber Membranes of Blends of Polyethersulfone and Sulfonated Polymers

et al. 2018

Self Cite

View full text Add to dashboard Cite

Hollow fiber membranes (HFM) are fabricated from blend solutions of a polyethersulfone (PESU) with a sulfonated PESU (sPESU) or a sulfonated polyphenylenesulfone (sPPSU). The influence of different additives in the dope solution and different bore fluids on the HFM are studied. The addition of poly(sodium 4-styrene sulfonate) (PSSNa)/ethylene glycol (EG) to the dope solution results in an increased water flux of the HFM compared to its counterparts without this additive system. The morphology of the hollow fibers is examined by scanning electron microscopy (SEM). The inner surface of the hollow fibers is studied by X-ray photoelectron spectroscopy (XPS), and it is found that water permeation through the hollow fiber membranes is facilitated due to the change in morphology upon the addition of the PSSNa/EG additive system, but not by the presence of hydrophilic sulfonic acid groups on the membrane surface.

show abstract

Section: Introductionmentioning

confidence: 99%

Hollow Fiber Membranes of Blends of Polyethersulfone and Sulfonated Polymers

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…The main focus of our study is put on the dry-jet wet spinning method of hollow fiber production. In such a method, one polymer solution (for single layer hollow fiber) 29 , 30 or, several solutions (for multiple layer hollow fiber) 31 and the bore fluid are extruded synchronously through the different annular gaps of a spinneret. The bore fluid used in such method usually is a precipitant for the spinning solution/s but miscible with the solvent or solvents used in the spinning solution/s.…”

Section: Introductionmentioning

confidence: 99%

Continuous Production of Macroporous Films: an Alternative to Breath Figure Assembly

Noor

Koll

Abetz

et al. 2017

Sci Rep

Self Cite

View full text Add to dashboard Cite

Despite the need for sophisticated instrumentation, breath figure assembly (BFA) methods are restricted to produce macroporous films on a tiny scale so far. The current study narrates the fabrication of macroporous films in hollow fiber geometry which extends to adopt the method for continuous production of isoporous surfaces from commercially available low-priced polymer materials. The fabrication of the films in the hollow fiber geometry is carried out by a co-centric quadruple orifice spinneret through which four different liquids are co-extruded simultaneously: bore fluid (to fill the lumen of the fiber), support layer solution, glycerol, and an isoporous film forming solution through the outer most orifice. The extruded entities plunge into a coagulation bath after passing a definite air gap. The implementation of the concept of diffuse-in, droplet formation, and then condense-out behavior of glycerol in a co-extrusion method of hollow fiber spinning makes macroporous film formation possible in an interminable way sidestepping the use of breath figure assembly method. Moreover, the continuous film formation by the proposed mechanism is also authenticated in flat sheet geometry by employing two casting blades in a casting machine. The structure of the films is analyzed by scanning electron microscopy (SEM).

show abstract

“…As most of the studies dealing with the formation of isoporous integral asymmetric membranes based on the SNIPS process were done on polystyrene‐ block ‐poly(4‐vinylpyridine) (PS‐ b ‐P4VP) diblock copolymers, including the blend study, in this paper we also address the question of structure formation of such diblock copolymer blends in the solution and in the solution‐cast films by using dynamic light scattering (DLS), small‐angle X‐ray scattering (SAXS), and transmission electron microscopy (TEM). A particularly interesting question is the molecular weight dependence of the domain spacing in the blend films in comparison to the relationship found for the surface morphology of the blend membranes.…”

Section: Introductionmentioning

confidence: 99%

Structure Formation of Binary Blends of Amphiphilic Block Copolymers in Solution and in Bulk

Radjabian

Abetz

Fischer

et al. 2017

Macro Chemistry & Physics

Self Cite

View full text Add to dashboard Cite

The self‐assembly and structure formation in binary blends of asymmetric polystyrene‐block‐poly(4‐vinylpyridine) diblock copolymers in different solvent systems and the bulk morphology of the blend films are studied by using dynamic light scattering, small‐angle X‐ray scattering, and transmission electron microscopy. In dilute solutions, the chains of pure diblock copolymers or binary blends of diblock copolymers having similar or different molecular weights remain as unimers, form common micelles in selective solvents or form unimers in coexistence with micelles in slightly selective solvents or solvent mixtures. The blends show mixing of the chemically similar blocks in the blend films and solutions at high concentrations. A single‐phase with common spherical morphology is formed in the blend films similar with the morphology of the individual components in the pure state. The characteristic length scale of the blends depends on the number average molecular weight following the typical scaling behavior of a strongly segregated block copolymer.

show abstract

A Facile Method to Prepare Double-Layer Isoporous Hollow Fiber Membrane by In Situ Hydrogen Bond Formation in the Spinning Line

Cited by 19 publications

References 31 publications

Hollow Fiber Membranes of Blends of Polyethersulfone and Sulfonated Polymers

Hollow Fiber Membranes of Blends of Polyethersulfone and Sulfonated Polymers

Continuous Production of Macroporous Films: an Alternative to Breath Figure Assembly

Structure Formation of Binary Blends of Amphiphilic Block Copolymers in Solution and in Bulk

Contact Info

Product

Resources

About