Modeling the dynamics of membrane structure formation in quenched polymer solutions

Barton, B. F.; McHugh, A. J.

doi:10.1016/s0376-7388(99)00257-4

Cited by 39 publications

(21 citation statements)

References 19 publications

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“…The production of porous polymer membranes by inversion of the nonsolvent phase (for example, of poly-(methyl methacrylate) (PMMA)) has been very thoroughly reported. [1] The polymerizable surfactant IL 1-(2-acryloyloxyundecyl)-3-methylimidazolium tetrafluoroborate (IL-BF 4 , m.p. 31.8 8C; Scheme 1) was synthesized as described in the Supporting Information.…”

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confidence: 99%

“…Prior to the polymerization, the molecules of the polymerizable surfactant IL-BF 4 are situated along these interfaces between the aqueous and liquid MMA nanodomains, with the hydrophilic imidazolium portions protruding into the aqueous domains or channels. Solvent exchange between the aqueous 1-propanol solution contained in the polymer gel and the KPF 6 solution facilitates the anion exchange from BF 4 À to PF 6 À in the IL moiety. It is well-known that methylimidazolium-based ionic liquids containing PF 6 À ions are hydrophobic and immiscible with water.…”

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confidence: 99%

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Solvent‐Reversible Poration in Ionic Liquid Copolymers

2007

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An open and closed case: Polymerization of microemulsions stabilized by surfactants based on ionic liquids leads to cross‐linked polymer gels which can be transformed into porous polymers by anion exchange of the ionic liquid moiety. These porous polymers can be converted back into polymer gels by immersion in organic solvents. Subsequent immersion of these gels in water then affords the porous polymers once more (see scheme).

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confidence: 99%

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Solvent‐Reversible Poration in Ionic Liquid Copolymers

2007

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“…Theoretically, diffusion in a ternary system is described by four diffusion coefficients, main diffusion coefficients, D 11 and D 22 and cross diffusion coefficients, D 12 and D 21 . In all predictions reported so far, the friction-based diffusion model proposed by Alsoy and Duda [29] were utilized.…”

Section: Effect Of Diffusion Formalismmentioning

confidence: 99%

“…Thus, there has been considerable motivation for developing mathematical models for phase inversion techniques to eliminate extensive trial and error experimentation and optimize membrane preparation conditions. Most of these mathematical models and corresponding experimental work is focused on wet cast [1][2][3][4][5][6][7][8][9][10][11][12][13] and thermal cast processes [10,[14][15][16]. However, there are relatively few quantitative studies on the dry-cast process even though this technique offers some advantages compared to other phase inversion techniques.…”

Section: Introductionmentioning

confidence: 99%

Membrane formation by dry-cast process

Altınkaya

Yenal

Ozbas

2005

Journal of Membrane Science

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Asymmetric membranes were prepared by dry-cast phase inversion technique from a cellulose acetate, acetone, water solution in order to assess the validity of the mathematical model recently developed by us. Based on the model predictions, general structural characteristics of the membranes were determined by plotting the composition paths on the ternary phase diagram and polymer concentration profile at the first moment of precipitation. Composition paths on the ternary phase diagram enable the assessment of whether a phase separation occurs and allow prediction of inception time and duration of the phase separation. The polymer distribution at the moment of precipitation provides a rough thickness of the high polymer concentration region near the interface and a pore distribution of the sublayer structure. The effects of polymer/nonsolvent ratio in the casting solution, the initial film thickness, evaporation temperature, relative humidity and velocity of air were investigated. Model predictions were compared with the morphological analysis conducted using scanning electron microscopy. Results show that diffusion formulation plays an important role in capturing the accurate structure of the membrane from the model predictions.

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“…A phase diagram of the pseudoternary IL-BF 4 /aqueous 1-propanol/MMA system at 24 8C is illustrated in the Supporting Information. A microemulsion consisting of IL-BF 4 (15 wt %), MMA (15 wt %), 1-propanol (35 wt %), and H 2 O (35 wt %) was initiated with 2,2-azobisisobutyronitrile (AIBN) at 60 8C.…”

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confidence: 99%