Effect of composition and nanostructure on CO2/N2 transport properties of supported alkyl-imidazolium block copolymer membranes

Nguyen, Phuc; Wiesenauer, Erin F.; Gin, Douglas L.; Noble, Richard D.

doi:10.1016/j.memsci.2012.12.016

Cited by 47 publications

(38 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Gu et al proposed that this effect was due to the influence of gas permeation through the block copolymer phase. And while it has been shown that the nanostructure of block copolymers has a significant effect on light-gas permeation and selectivity properties [28], it is not clear that glassy polystyrene domains (comprising only 0.5 wt% of the membrane mass) can beresponsible in this case. On the other hand, it has also been shown that confinement of ionic liquids inside the nanostructure of porous materials can significantly affect CO 2 diffusivity and solubility properties [52,53].…”

Section: Co 2 /N 2 Permeation and Separation Performancementioning

confidence: 93%

“…[24][25][26][27][28][29],the dense polymer materials have significantly lower CO 2 permeability than composite materials that contain free RTIL. [28,29] Of the few examples ofmembranes based on block copolymer/RTIL blends reported to date [21-23, 28, 29], all involvea shared fabrication strategydependent on solvent-casting of a co-solution of block copolymer and RTIL into a porous support material.Gu et al [21,22]and Rabiee et al [23]report CO 2 /N 2 separation performances of their membranesto be slightly above the 2008 Robeson plot upper bound, showing the potential of block-copolymer-based materials to be used as efficient CO 2 /N 2 separation membrane materials. However, the common disadvantageshared by these systems is the apparent compromise of mechanical integrity with increased RTIL loadings, a strategy used to improve the liquid-like character of the membrane and thus CO 2 permeabilities.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Elastic free-standing RTIL composite membranes for CO2/N2 separation based on sphere-forming triblock/diblock copolymer blends

Wijayasekara

Cowan

Lewis

et al. 2016

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

Solvent-free,melt-state self-assembly of sphere-formingpolystyrene-b-poly(ethylene oxide) diblock copolymer/polystyrene-b-poly(ethylene oxide)-b-polystyrene triblock copolymer (SO/SOS) blends has been used to produce free-standing,roomtemperature ionic liquid (RTIL) composite membranes with excellent mechanical properties and CO 2 /N 2 separation performance. Membranes were prepared from vitrified SO/SOS diblock/triblock meltsby swellingwithgreater than 94 wt% 1-ethyl-3-methylimidazoliumbis(trifluoromethylsulfonyl)imide ([EMIM][TFSI]) ionic liquid. Thesefree-standingcomposite membranes were evaluated for their CO 2 /N 2 separation performance over a range of transmembrane pressures,with resultstraversingthe 2008 Robeson upper bound.Even with such high loadings of neat [EMIM][TFSI], these membranes exhibit the mechanical properties of solid elastomers, evident by the

show abstract

Section: Co 2 /N 2 Permeation and Separation Performancementioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Elastic free-standing RTIL composite membranes for CO2/N2 separation based on sphere-forming triblock/diblock copolymer blends

Wijayasekara

Cowan

Lewis

et al. 2016

Journal of Membrane Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…2,4,9,10 This strategy is particularly effective for CO 2 separation as the quadrupole moment of the gas results in strong electrostatic interactions with the ions of the IL. 11 However, the IL/polymer structure can lose its robustness even at low pressures, 12 when the IL is partially forced out of the membrane by the gas. Thus, better mechanical stability is important when designing new membrane materials.…”

Section: Introductionmentioning

confidence: 99%

Molecular simulation study of CO2 and N2 absorption in a phosphonium based organic ionic plastic crystal

Kandagal

Chen

Jónsson

et al. 2017

The Journal of Chemical Physics

View full text Add to dashboard Cite

An organic ionic plastic crystal (OIPC), methyl(diethyl)isobutylphosphonium hexafluorophosphate [P][PF], was investigated for CO and N absorption using molecular simulations. Ab initio calculations showed that both the cation and anion exhibit larger binding energy for CO compared with N. The CO absorption, as calculated from classical molecular dynamics simulations, increased by a factor of 7.5 from 275 K to 325 K, while that of N showed low absorption at both temperatures. The simulations suggest that the significant increase in CO absorption at 325 K is attributed to a higher degree of disorder and increase in the free volume due to the gas/solid interfaces. While the ab initio calculations were helpful in identifying specific interaction sites on the constituent ions, the classical MD simulations elucidated the importance of interfaces in gas absorption studies in this material. The results show that the OIPC can be a promising material for CO separations from CO/N mixture.

show abstract

“…Block copolymers, which have unique architectures such as star, comb, and miktoarm shapes, make it possible to broaden the applications of polymer materials and to expxlore the influence of chain architecture on the physical and chemical properties of polymers [2]. Thin films formed by block copolymers with well-defined nanostructures have received great attention because of their potential nanofabrication applications [3][4][5][6][7][8][9][10]. In these applications, there are some influential factors that have potential significance in adjusting the phase morphology of the block copolymer thin film and in obtaining an ordered phase-separated micro-domain, which can promote the function of the materials.…”

Section: Introductionmentioning

confidence: 99%

Changes in the phase morphology of miktoarm PS-b-PMMA copolymer induced by a monolayer surface

Wang

2015

Colloid Polym Sci

View full text Add to dashboard Cite

It is known that polystyrene (PS) and poly(methyl methacrylate) (PMMA) blocks are immiscible at 383, 413, and 443 K and that their Flory-Huggins interaction parameters have the same blending ratio dependence at those temperatures. In this study, the phase morphologies of six groups of 12 miktoarm PS-b-PMMA copolymers were investigated at 383, 413, and 443 K via MesoDyn simulations. There is nearly no change for the same copolymer under different temperatures. We designed four series of patterned surfaces (18 total) and found that the inducing effect of these surfaces has some influence on the microscopic phase morphology of the polymers, including a reinforcing immiscible effect and a weakening immiscible effect. The degree of phase separation depended on the molecular architecture of the block copolymers, temperature, and the characteristics of the inducing surfaces. Higher temperature and higher PS-rich component copolymers exhibited higher order parameters. The co-4432 and co-8832 surfaces exhibited the most intensive inducing effect because of their 16 and 32 independent micro-environments, respectively. A set of comparative simulations was carried out with a high interaction energy between the polymeric species. The results confirmed the possibility of forming a hexagonal columnar phase with a core shell composed of the designed molecular structures as well as demonstrated the potential application of micro-environments in producing special mesoscopic structures.

show abstract

Effect of composition and nanostructure on CO2/N2 transport properties of supported alkyl-imidazolium block copolymer membranes

Cited by 47 publications

References 51 publications

Elastic free-standing RTIL composite membranes for CO2/N2 separation based on sphere-forming triblock/diblock copolymer blends

Elastic free-standing RTIL composite membranes for CO2/N2 separation based on sphere-forming triblock/diblock copolymer blends

Molecular simulation study of CO2 and N2 absorption in a phosphonium based organic ionic plastic crystal

Changes in the phase morphology of miktoarm PS-b-PMMA copolymer induced by a monolayer surface

Contact Info

Product

Resources

About