The influence of casting solution structure on the microporosity of polyetherimide gas separation membranes prepared by the coagulation post-leaching method

Kurdi, J.; Tremblay, André Y.

doi:10.1016/s0376-7388(00)00629-3

Cited by 22 publications

(6 citation statements)

References 27 publications

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“…Compositions c and d had a smaller polymer concentration than b, which was designed to further increase the fiber porosity. In all compositions, LiNO 3 was used as an additive because it forms a complex with NMP in the polymer dope, which increases the number of pore spaces after solvent extraction [14].…”

Section: Preparation Of the Polymer Solutionmentioning

confidence: 99%

Mechanically robust hollow fiber supported ionic liquid membranes for CO2 separation applications

Wickramanayake

Hopkinson

Myers

et al. 2014

Journal of Membrane Science

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Polymeric hollow fiber supported ionic liquid membranes (SILMs) were fabricated utilizing Matrimid ® and Torlon ® as the supporting structure and the ionic liquid (IL) 1-hexyl-3methylimidalzolium bis(trifluoromethylsulfonyl)imide ([C 6 mim][Tf 2 N]) as the gas transport media. This IL served as a baseline while the polymer and the fiber pore morphology were varied in order to optimize the support structure. By using sufficiently high fiber porosity, and thus maximizing the IL content of the membrane, it was found that the permeance and selectivity for CO 2 /H 2 separation were comparable for both Matrimid ® and Torlon ® supports. However, the mechanical strength of Matrimid ® supports was low when saturated with IL. Therefore Torlon ® fibers were subsequently investigated because of the higher strength of this material. Molecular modeling was used to investigate the source of the increased strength of Torlon ® , and it was found that the polymer chains in Torlon ® tend to interlock with each other to a greater degree than Matrimid ®. Also, the IL [C 6 mim][Tf 2 N] has less interaction with Torlon ® than with Matrimid ®. In this work the permeance and selectivity for CO 2 /H 2 of these hollow fiber SILMs are reported, as well as the tensile strength, Young's modulus, and glass transition temperature. Threshold image analysis was used to determine the volume fractions of polymer, macro-voids, and micro-voids. X-ray computed tomography scanning was used to non-destructively evaluate the location of IL within the fiber wall.

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Section: Preparation Of the Polymer Solutionmentioning

confidence: 99%

Mechanically robust hollow fiber supported ionic liquid membranes for CO2 separation applications

Wickramanayake

Hopkinson

Myers

et al. 2014

Journal of Membrane Science

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“…Lithium nitrate added to the dope decreases the formation of the voids and at high enough concentrations suppresses their formation completely. Kurdi et al have suggested that the lithium ion complexes with two molecules of the solvent ( N -methyl-2-pyrrolidione). This leads us to conclude that the macrovoid suppression in Ultem fibers results from the lowered solvent diffusivity within the coagulating membrane as suggested by Cohen-Addad .…”

Section: Macrovoids In Ultem-based Hollow Fiber Membranesmentioning

confidence: 99%

Macrovoids in Hybrid Organic/Inorganic Hollow Fiber Membranes

Husain

Koros

2009

Ind. Eng. Chem. Res.

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Large, characteristically tear- or finger-shaped voids found in polymer hollow fiber membranes, termed macrovoids, have been known since the early development of asymmetric membranes. These voids are undesirable as they decrease the mechanical integrity of the hollow fiber membrane, limiting the use of high pressure feeds for separations. Moreover, if such macrovoids penetrate the selective layer they become and even more serious problem for membrane performance. With current membrane technology moving toward a mixed-matrix hybrid format with inorganic and carbon molecular sieves embedded in a polymer matrix, additional complications caused by the presence of particulates within the spinning dope toward the formation of macrovoids must be considered. While numerous hypotheses have been suggested regarding the formation of macrovoids formed in polymer-only membranes, no mention so far has been made of such macrovoids initiated in hollow fiber membranes by particles present in the spinning dope. This paper provides evidence for the presence of such macrovoids for such a spinning dope and presents a hypothesis for their formation. This hypothesis is presented in terms of a similar basic mechanism for macrovoid formation in mixed-matrix membranes that benefits from an understanding of macrovoid formation in conventional polymer-only asymmetric membranes. Moreover, decreasing the sieve particle size tends to suppress macrovoid formation tendency, which is consistent with the proposed mechanism.

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“…Integrally asymmetric membranes with different pore sizes can find applications in diverse fields, such as reverse osmosis, nanofiltration, ultrafiltration, pervaporation and gas separation [6][7][8][9][10][11][12]. The development of integrally asymmetric membranes from poly(ether imide) (PEI) for different applications is well documented in literature [13][14][15][16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Preparation of novel composite membranes: Reactive coating on microporous poly(ether imide) support membranes

Albrecht¹,

Schauer

Weigel³

et al. 2006

Journal of Membrane Science

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The influence of casting solution structure on the microporosity of polyetherimide gas separation membranes prepared by the coagulation post-leaching method

Cited by 22 publications

References 27 publications

Mechanically robust hollow fiber supported ionic liquid membranes for CO2 separation applications

Mechanically robust hollow fiber supported ionic liquid membranes for CO2 separation applications

Macrovoids in Hybrid Organic/Inorganic Hollow Fiber Membranes

Preparation of novel composite membranes: Reactive coating on microporous poly(ether imide) support membranes

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