Direct measurement of rheologically induced molecular orientation in gas separation hollow fibre membranes and effects on selectivity

A.F. Ismail, S.J. Shilton, I.R. Dunkin, S.L. Gallivan

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

Asymmetric polysulfone hollow fibre membranes for gas separation were spun using a dry/wet spinning process. An optimised four component dope solution was used: 22% (w/w) polysulfone, 31.8% (w/w) N,N-dimethylacetamide, 31.8% (w/ w) tetrahydrofuran and 14.4% (w/w) ethanol. Fibres were spun at low- and high-dope extrusion rates and hence at different levels of shear. Molecular orientation in the active layer of the membranes was measured by plane-polarised infrared spectroscopy. Gas permeation properties (permeability and selectivity) were evaluated using pure carbon dioxide and methane. The spectroscopy indicated that increased molecular orientation occurs in the high-shear membranes. The selectivities of these membranes were heightened and even surpassed the recognised intrinsic selectivity of the membrane polymer. The results suggest that increased shear during spinning increases molecular orientation and, in turn, enhances selectivity.
Original languageEnglish
Pages (from-to)133-137
Number of pages5
JournalJournal of Membrane Science
Volume126
Issue number1
DOIs
Publication statusPublished - 2 Apr 1997

Fingerprint

Molecular orientation
hollow
Gases
selectivity
membranes
Membranes
fibers
Fibers
gases
Polysulfones
shear
Spectrum Analysis
wet spinning
Methane
tetrahydrofuran
Carbon Dioxide
Permeation
metal spinning
Extrusion
carbon dioxide

Keywords

  • hollow fibre membranes
  • gas separation
  • spectroscopy
  • molecular orientation
  • enhanced selectivity

Cite this

Ismail, A.F. ; Shilton, S.J. ; Dunkin, I.R. ; Gallivan, S.L. / Direct measurement of rheologically induced molecular orientation in gas separation hollow fibre membranes and effects on selectivity. In: Journal of Membrane Science. 1997 ; Vol. 126, No. 1. pp. 133-137.
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abstract = "Asymmetric polysulfone hollow fibre membranes for gas separation were spun using a dry/wet spinning process. An optimised four component dope solution was used: 22{\%} (w/w) polysulfone, 31.8{\%} (w/w) N,N-dimethylacetamide, 31.8{\%} (w/ w) tetrahydrofuran and 14.4{\%} (w/w) ethanol. Fibres were spun at low- and high-dope extrusion rates and hence at different levels of shear. Molecular orientation in the active layer of the membranes was measured by plane-polarised infrared spectroscopy. Gas permeation properties (permeability and selectivity) were evaluated using pure carbon dioxide and methane. The spectroscopy indicated that increased molecular orientation occurs in the high-shear membranes. The selectivities of these membranes were heightened and even surpassed the recognised intrinsic selectivity of the membrane polymer. The results suggest that increased shear during spinning increases molecular orientation and, in turn, enhances selectivity.",
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Direct measurement of rheologically induced molecular orientation in gas separation hollow fibre membranes and effects on selectivity. / Ismail, A.F.; Shilton, S.J.; Dunkin, I.R.; Gallivan, S.L.

In: Journal of Membrane Science, Vol. 126, No. 1, 02.04.1997, p. 133-137.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Direct measurement of rheologically induced molecular orientation in gas separation hollow fibre membranes and effects on selectivity

AU - Ismail, A.F.

AU - Shilton, S.J.

AU - Dunkin, I.R.

AU - Gallivan, S.L.

PY - 1997/4/2

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AB - Asymmetric polysulfone hollow fibre membranes for gas separation were spun using a dry/wet spinning process. An optimised four component dope solution was used: 22% (w/w) polysulfone, 31.8% (w/w) N,N-dimethylacetamide, 31.8% (w/ w) tetrahydrofuran and 14.4% (w/w) ethanol. Fibres were spun at low- and high-dope extrusion rates and hence at different levels of shear. Molecular orientation in the active layer of the membranes was measured by plane-polarised infrared spectroscopy. Gas permeation properties (permeability and selectivity) were evaluated using pure carbon dioxide and methane. The spectroscopy indicated that increased molecular orientation occurs in the high-shear membranes. The selectivities of these membranes were heightened and even surpassed the recognised intrinsic selectivity of the membrane polymer. The results suggest that increased shear during spinning increases molecular orientation and, in turn, enhances selectivity.

KW - hollow fibre membranes

KW - gas separation

KW - spectroscopy

KW - molecular orientation

KW - enhanced selectivity

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DO - 10.1016/S0376-7388(96)00274-8

M3 - Article

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JO - Journal of Membrane Science

JF - Journal of Membrane Science

SN - 0376-7388

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