Journal Article

PUBDB-2015-00217

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Tailoring the Morphology of Self-Assembled Block Copolymer Hollow Fiber Membranes

Radjabian, M.>Extern* ; Koll, J. ; Buhr, K.>Extern* ; Vainio, U.>Extern*DESY* ; Abetz, C. ; Handge, U. A. ; Abetz, V. (Corresponding author)>Extern*

2014
Elsevier Science Oxford

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Please use a persistent id in citations: doi:10.1016/j.polymer.2014.04.041

Abstract: Isoporous asymmetric polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) hollow fiber membraneswere successfully made by a dry-jet wet spinning process. Well-defined nanometer-scale pores around20e40 nm in diameter were tailored on the top surface of the fiber above a non-ordered macroporouslayer by combining block copolymer self-assembly and non-solvent induced phase separation (SNIPS).Uniformity of the surface-assembled pores and fiber cross-section morphology was improved byadjusting the solution concentration, solvent composition as well as some important spinning parameterssuch as bore fluid flow rate, polymer solution flow rate and air gap distance between the spinneretand the precipitation bath. The formation of the well-organized self-assembled pores is a result of theinterplay of fast relaxation of the shear-induced oriented block copolymer chains, the rapid evaporationof the solvent mixture on the outer surface and solvent extraction into the bore liquid on the lumen side,and gravity force during spinning. Structural features of the block copolymer solutions were investigatedby small-angle X-ray scattering (SAXS) and rheological properties of the solutions were examined aswell. The scattering patterns of the optimal solutions for membrane formation indicate a disorderedphase which is very close to the disorder-order transition. The nanostructured surface and cross-sectionmorphology of the membranes were characterized by scanning electron microscopy (SEM). The waterflux of the membranes was measured and gas permeation was examined to test the pressure stability ofthe hollow fibers.

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Contributing Institute(s):

1. DOOR-User (DOOR)
2. EMBL (EMBL)
3. EMBL-User (EMBL-User)

Research Program(s):

1. DORIS Beamline A2 (POF2-54G13) (POF2-54G13)
2. PETRA Beamline P12 (POF2-54G14) (POF2-54G14)

Experiment(s):

1. DORIS Beamline A2 (DORIS III)
2. PETRA Beamline P12 (PETRA III)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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