Effect of an aprotic solvent on the properties and structure of ion-exchange membranes

Demina, O. A.; Демин, А. В.; Gnusin, N. P.; Заболоцкий, В. И.

doi:10.1134/s0965545x10120059

Cited by 10 publications

(6 citation statements)

References 34 publications

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“…Particularly in the work [103] the method of lithium chloride electrodialysis concentrating from technological solutions of hardened polyamide filament production containing dimethylacetamide (DMAA) is offered. In the cycle of works [103][104][105][106] the degradation degree of physical-chemical and transport characteristics of ion exchange membranes in organic-mineral mixtures was estimated. In the present work the influence of aprotic solvent DMAA on structural characteristics of perfluorinated MF-4SK membranes is investigated.…”

Section: Influence Of Organic Solvents On Structural Characteristics mentioning

confidence: 99%

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Kononenko

Fomenko

Volfkovich

2015

Advances in Colloid and Interface Science

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Section: Influence Of Organic Solvents On Structural Characteristics mentioning

confidence: 99%

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Kononenko

Fomenko

Volfkovich

2015

Advances in Colloid and Interface Science

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“…The mechanism of MA-41 membrane modification is likely based on different degrees of membrane swelling in water and organic solvents. Previous studies showed that MA-41 and MA-40 membranes exhibit greater swelling in organic solvents like N,N-dimethylacetamide compared to that in water [26,27]. The variation in swelling degree in heterogeneous membranes can be attributed to the increase in the linear size of the ion exchange granules, while the inert binder (polyethylene) does not interact significantly with the solvent, and its geometry remains relatively unchanged.…”

Section: Resultsmentioning

confidence: 98%

Use of electrochemical impedance spectroscopy to assess the stability of the anion exchange membrane MA-41, modified by poly-N,N-diallylmorpholine bromide in overlimiting current modes

Bondarev,

Achoh,

Bespalov

et al. 2023

Chim.Tech.Acta

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The paper presents the results of studying the electrochemical characteristics and long-term stability of MA-41 membranes on the surface of which poly-N,N-diallylmorpholinium bromide was applied. The deposition of a polyelectrolyte on the membrane surface leads to an increase in the limiting current from 0.8 to 1.1 mA/cm2. The comparison of the experimental and theoretically calculated values of the limiting current density allows us to conclude that the modification of the membrane surface by poly-N,N-diallylmorpholinium bromide does not lead to the formation of a continuous polyelectrolyte film on the surface, but its fixation occurs due to the sorption of macromolecules on the surface of the ion-exchanger particles. To quantify the rate of the water dissociation reaction at the membrane/solution interface, the method of electrochemical impedance was used, which makes it possible to compare the rate constants of the water dissociation reaction for different membranes, assuming that the reaction is described by the Gericher impedance. It is shown that modification of the MA-41 membrane surface leads to a decrease in the rate of the water dissociation reaction in the current range i = 1.5–4ilim by a factor of 2–6. The reduction in water dissociation reaction rate is attributed to the substitution of catalytically active secondary and tertiary amino groups in the surface layer of the pristine membrane by stable heterocyclic ammonium bases of poly-N,N-diallylmorpholinium. The study of the long-term stability of the resulting membrane showed that when the membrane is polarized with a current equal to twice the limiting current, the desorption of the modifier occurs within 25 h, and the properties of the membrane become close to those of the unmodified MA-41 membrane. It was shown that the electrochemical impedance method can be used as a very sensitive method for studying the long-term stability of ion-exchange membranes.

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“…The absence of elevated temperature enabled the use of a water/methanol solvent mixture, resulting in pre-hydrated membranes without large solvent evaporation pores. Adjusting various formulation and fabrication parameters with C-HPG5, such as solvent, polymer concentration, and thermal/photo-initiation, allows for a range of customizable hyperbranched polyelectrolyte membranes with specific nanocomposite properties and electrophoretic transport capabilities (Demina et al, 2010). Both the photo- and thermal-initiated gels comprising 70–75% C-HPG5 (excluding solvent content) were able to withstand drying, swelling, and solvent exchange such as methanol and water (Figure S6).…”

Section: Discussionmentioning

confidence: 99%

Formation of Monolithic Ion-Selective Transport Media Based on “Click” Cross-Linked Hyperbranched Polyglycerol

et al. 2019

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In the emerging field of organic bioelectronics, conducting polymers and ion-selective membranes are combined to form resistors, diodes, transistors, and circuits that transport and process both electronic and ionic signals. Such bioelectronics concepts have been explored in delivery devices that translate electronic addressing signals into the transport and dispensing of small charged biomolecules at high specificity and spatiotemporal resolution. Manufacturing such “iontronic” devices generally involves classical thin film processing of polyelectrolyte layers and insulators followed by application of electrolytes. This approach makes miniaturization and integration difficult, simply because the ion selective polyelectrolytes swell after completing the manufacturing. To advance such bioelectronics/iontronics and to enable applications where relatively larger molecules can be delivered, it is important to develop a versatile material system in which the charge/size selectivity can be easily tailormade at the same time enabling easy manufacturing of complex and miniaturized structures. Here, we report a one-pot synthesis approach with minimal amount of organic solvent to achieve cationic hyperbranched polyglycerol films for iontronics applications. The hyperbranched structure allows for tunable pre multi-functionalization, which combines available unsaturated groups used in crosslinking along with ionic groups for electrolytic properties, to achieve a one-step process when applied in devices for monolithic membrane gel formation with selective electrophoretic transport of molecules.

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Effect of an aprotic solvent on the properties and structure of ion-exchange membranes

Cited by 10 publications

References 34 publications

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Structure of perfluorinated membranes investigated by method of standard contact porosimetry

Use of electrochemical impedance spectroscopy to assess the stability of the anion exchange membrane MA-41, modified by poly-N,N-diallylmorpholine bromide in overlimiting current modes

Formation of Monolithic Ion-Selective Transport Media Based on “Click” Cross-Linked Hyperbranched Polyglycerol

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