How ionic liquid changes properties of dense polydimethylsiloxane membrane?

Kohoutová, M.; Sikora, Antonín; Hovorka, Štěpán; Randová, Alena; Schauer, Jan; Poloncarzová, Magda; Izák, Pavel

doi:10.5004/dwt.2010.1013

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…These measurements were made with three different PDMS coupons for each solvent to get a reasonable assessment. The sorption coefficient of the pure solvent was calculated as the ratio of the weight of solvent absorbed to the dry weight of the membrane …”

Section: Methodsmentioning

confidence: 99%

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Nonlinear Flux–Pressure Behavior of Solvent Permeation through a Hydrophobic Nanofiltration Membrane

et al. 2021

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Nonpolar solvents have been reported to exhibit a nonlinear flux–pressure behavior in hydrophobic membranes. This study explored the flux–pressure relationship of six nonpolar solvents in a lab-cast hydrophobic poly(dimethylsiloxane) (PDMS) membrane and integrated the permeance behavior in the evaluation of the proposed transport model. The solvents exhibited a nonlinear relationship with the applied pressure, along with the point of permeance transition (1.5–2.5 MPa), identified as the critical pressure corresponding to membrane compaction. Two classical transport models, the pore-flow model and solution-diffusion model, were evaluated for the prediction of permeance. The solution-diffusion model indicated a high correlation with the experimental results before the point of transition (R 2 = 0.97). After the point of transition, the compaction factor (due to membrane compaction after the critical pressure) derived from the permeance characteristics was included, which significantly improved the predictability of the solution-diffusion model (R 2 = 0.91). A nonlinear flux–pressure behavior was also observed in hexane–oil miscella (a two-component system), confirming the existence of a similar phenomenon. The study revealed that a solution-diffusion model with appropriate inclusion of compaction factor could be used as a prediction tool for solvent permeance over a wide range of applied transmembrane pressures (0–4 MPa) in solvent-resistant nanofiltration (SRNF) membranes.

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Section: Methodsmentioning

confidence: 99%

“…The sorption coefficient of the pure solvent was calculated as the ratio of the weight of solvent absorbed to the dry weight of the membrane. 26 5.4. Model Fitting and Statistical Analysis.…”

Section: Sorption Studiesmentioning

confidence: 99%

Nonlinear Flux–Pressure Behavior of Solvent Permeation through a Hydrophobic Nanofiltration Membrane

et al. 2021

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“…It is used in biomedicine [ 3 , 4 ], microfluidics [ 5 , 6 , 7 ], MEMS [ 8 ], triboelectricity [ 9 ] and piezoelectrics [ 10 ]. Motivation to explore the structure and dynamics of ionic PDMS [ 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ] or other melts [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 ], is very high since ionic interactions inherit polymers with a functionality that leads to a high performance and applications as gas-separating membranes [ 15 ], water purification membranes [ 13 , 14 , 16 ], energy storage devices [ 39 , 40 ] as well as in sensing [ 22 , 23 ], actuation [ 21 ], fuel cells [ 41 ], and others [ 18 , 19 , 24 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Structure and Diffusion of Ionic PDMS Melts

2022

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Ionic polymers exhibit mechanical properties that can be widely tuned upon selectively charging them. However, the correlated structural and dynamical properties underlying the microscopic mechanism remain largely unexplored. Here, we investigate, for the first time, the structure and diffusion of randomly and end-functionalized ionic poly(dimethylsiloxane) (PDMS) melts with negatively charged bromide counterions, by means of atomistic molecular dynamics using a united atom model. In particular, we find that the density of the ionic PDMS melts exceeds the one of their neutral counterpart and increases as the charge density increases. The counterions are condensed to the cationic part of end-functionalized cationic PDMS chains, especially for the higher molecular weights, leading to a slow diffusion inside the melt; the counterions are also correlated more strongly to each other for the end-functionalized PDMS. Temperature has a weak effect on the counterion structure and leads to an Arrhenius type of behavior for the counterion diffusion coefficient. In addition, the charge density of PDMS chains enhances the diffusion of counterions especially at higher temperatures, but hinders PDMS chain dynamics. Neutral PDMS chains are shown to exhibit faster dynamics (diffusion) than ionic PDMS chains. These findings contribute to the theoretical description of the correlations between structure and dynamical properties of ion-containing polymers.

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“…One type of chemical engineering process, where mixed solvents have found broad use is separation of components from mixtures. Our research is focused on membrane separation processes and, as a further challenge, on the separation of single enantiomers from their racemic mixtures. The preparation of single enantiomers is important in the pharmaceutical industry and in pharmacology because two enantiomers may exhibit completely different biological or pharmacological activities, pharmacokinetic profiles or effectiveness, or they may exhibit different potency, as the interacting molecules in biological systems are also chiral .…”

Section: Introductionmentioning

confidence: 99%

Describing the sorption characteristics of a ternary system of benzene (1) and alcohol (2) in a nonporous polymer membrane (3) by theFlory–Huggins model

Hovorka

Randová

Sysel

et al. 2014

Polymer Engineering & Sci

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The Flory-Huggins equation was used to describe results of total and preferential sorption measurements for the binary liquid mixture of benzene (1) and alcohol (2) in one of two nonporous polymer membranes (3), low-density polyethylene (LDPE) and Nafion membrane. The concentration dependence of binary and ternary interaction parameters was determined. The interaction parameters for the benzene -methanol binary mixture were obtained from binary vapor-liquid equilibrium data in the literature to decrease the number of adjusted parameters. The results show that use of a ternary interaction parameter is necessary. Data treatment was performed assuming either no crystallinity or an average crystallinity typical for the studied membranes. Subsequently, the limiting activity coefficients of solutes in LDPE were calculated from the values of the interaction parameters and their values compared to values of the limiting activity coefficients of benzene and methanol in hypothetical liquid alkane with the same density as LDPE obtained by the UNIFAC method. POLYM. ENG. SCI., 55:1187-1195

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How ionic liquid changes properties of dense polydimethylsiloxane membrane?

Cited by 4 publications

References 5 publications

Nonlinear Flux–Pressure Behavior of Solvent Permeation through a Hydrophobic Nanofiltration Membrane

Nonlinear Flux–Pressure Behavior of Solvent Permeation through a Hydrophobic Nanofiltration Membrane

Structure and Diffusion of Ionic PDMS Melts

Describing the sorption characteristics of a ternary system of benzene (1) and alcohol (2) in a nonporous polymer membrane (3) by theFlory–Huggins model

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