Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

Mori, Dylan I.; Martin, Rhia M.; Noble, Richard D.; Gin, Douglas L.

doi:10.1016/j.polymer.2017.01.064

Cited by 17 publications

(33 citation statements)

References 55 publications

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“…Two variations, referred to as polycondensation and addition polymerization, differ from each other based on a formation of a small by-product during the combination of two monomers and the rearrangement of an unsaturated bond into a saturated bond upon the reaction with another molecule, respectively. The majority of the PILs synthesized by a polycondensation employ polyurethane (PU) and polyepoxide S-G chemistry [ 145 , 161 , 177 ]. A broad variety of PU-based PILs has been prepared to investigate the influence of different ionic diols as cations and counterions on the CO 2 selectivity [ 178 , 179 ].…”

Section: Polymeric Ionic Liquids (Pils)mentioning

confidence: 99%

A Review on Ionic Liquid Gas Separation Membranes

et al. 2021

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Ionic liquids have attracted the attention of the industry and research community as versatile solvents with unique properties, such as ionic conductivity, low volatility, high solubility of gases and vapors, thermal stability, and the possibility to combine anions and cations to yield an almost endless list of different structures. These features open perspectives for numerous applications, such as the reaction medium for chemical synthesis, electrolytes for batteries, solvent for gas sorption processes, and also membranes for gas separation. In the search for better-performing membrane materials and membranes for gas and vapor separation, ionic liquids have been investigated extensively in the last decade and a half. This review gives a complete overview of the main developments in the field of ionic liquid membranes since their first introduction. It covers all different materials, membrane types, their preparation, pure and mixed gas transport properties, and examples of potential gas separation applications. Special systems will also be discussed, including facilitated transport membranes and mixed matrix membranes. The main strengths and weaknesses of the different membrane types will be discussed, subdividing them into supported ionic liquid membranes (SILMs), poly(ionic liquids) or polymerized ionic liquids (PILs), polymer/ionic liquid blends (physically or chemically cross-linked ‘ion-gels’), and PIL/IL blends. Since membrane processes are advancing as an energy-efficient alternative to traditional separation processes, having shown promising results for complex new separation challenges like carbon capture as well, they may be the key to developing a more sustainable future society. In this light, this review presents the state-of-the-art of ionic liquid membranes, to analyze their potential in the gas separation processes of the future.

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Section: Polymeric Ionic Liquids (Pils)mentioning

confidence: 99%

A Review on Ionic Liquid Gas Separation Membranes

et al. 2021

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“…Colby and Einloft [76][77][78][79][80] have produced polyurethane anionomer with IL counter-cations (PIL-7). Moreover, the ILs as chain terminators [81] or cross-linkers [82] were also reported. In addition, poly(ionic liquid)s featuring thiazolium units are in general rarely reported.…”

Section: Innovative Structures Of Pilsmentioning

confidence: 99%

Poly(ionic liquid)s: Platform for CO2 capture and catalysis

Zhou¹,

Weber²,

Yuan³

2019

Current Opinion in Green and Sustainable Chemistry

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Capture and conversion of CO2 are of great importance for environment-friendly and sustainable development of human society. Poly(ionic liquid)s (PILs) combine some unique properties of ILs with that of polymers and are versatile materials for CO2 utilization. In this contribution, we briefly outline innovative poly(ionic liquid)s emerged over the past few years, such as polytriazoliums, deep eutectic monomer (DEM) based PILs, and polyurethane PILs. Additionally, we discuss their advantages and challenges as materials for Carbon Capture and Storage (CCS), and the fixation of CO2 into useful materials. KeywordsPoly(ionic liquid); CO2 capture; CO2 catalysis; CO2 utilization adsorption processes (PTSA). Materials under discussion include micro/meso-porous silica or zeolites [13,14], metal-organic frameworks (MOFs) [15][16][17][18][19], covalent organic frameworks (COFs) [20,21], carbonaceous materials [22,23], and more [24,25]. Among them, the hybrid MOFs (up to 27 wt%) and zeolites (up to 18 wt%) exhibit exceptionally high CO2 uptake around room temperature and atmospheric pressure. [26,27] A still very valuable review of different material classes for CO2 capture by adsorption, also with respect to technical issues, was provided by Hedin and coworkers recently [28]. Material combinations such as zeolite/activated carbon have already been implemented into pilot-scale in real power plants. [29] Along this line, there is considerable interest in developing alternative techniques. Since Blanchard et al. [30] firstly reported CO2 capture by ionic liquids (ILs), ILs have attracted much attention in the field of gas capture and separation. ILs carry unique properties, such as negligible vapor pressure, low flammability, high thermal stabilities, excellent gas selectivity, and tunable properties, just to name a few, which make them multifunctional [31]. However, the high viscosity and the associated relatively low CO2 sorption/desorption rates of ILs [32][33][34] hamper their application in gas capture.Recent success in poly(ionic liquid)s (PILs), i.e. the polymeric product of ILs, promotes their usage in and beyond CO2 sorption due to a variety of new features of PILs in comparison to ILs [8,[35][36][37][38]. PILs are composed of covalently linked IL species [31], and carry features of macromolecules, thus elegantly combining some unique properties and functions of ILs with that of polymers (e.g. easy processability and shape durability). Although suffering from a relatively poor capacity of CO2 (generally <10 wt%) and a high cost in comparison to commercial CO2 absorbents, the affinity of PILs towards CO2 can be tailor-made through judicious choice of the IL groups and the polymer backbones, as well as the polymer structures [39][40][41][42]. Thus the PIL technology in CO2 utilization encompasses not only CO2 capture because of its scientific interest, but also the catalytic CO2 activation, sensing, and conversion to value-added chemical feedstocks and high-end polymers. This contribution presents a brief overview of ne...

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“…To improve the stability and tunability of SILMs, the ionic liquid moiety can be attached to a polymer backbone to form a network polymerized ionic liquid. While network polymerized ionic liquids have been well-investigated in the gas separations field for CO 2 /N 2 and CO 2 /CH 4 , − ,,,− there is little research on these materials for liquid separations. Singh et al found that, for poly(ionic liquid)-ionic liquid-zeolite mixed-matrix membranes, membrane permeability to CO 2 and selectivity relative to CH 4 were unaffected upon decreasing the cross-link density from 8% to 2% in the absence of zeolite loading .…”

Section: Introductionmentioning

confidence: 99%

Molecular Design of Precise Network Polymerized Ionic Liquid Membranes for Toluene/Heptane Separations

Sheridan

Evans²

2019

Ind. Eng. Chem. Res.

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Precise network polymerized ionic liquid membranes with tethered imidazolium cations, variable anion, and controlled cross-link density were developed to understand how molecular structure impacts solubility and diffusion in the context of toluene/heptane separations. Switching the anion from tetrafluoroborate (BF4) to bis(trifluoromethane sulfonimide) led to a 25 K drop in the glass transition temperature, concomitant increase in penetrant diffusion coefficients, and increased solubility of toluene relative to heptane. Reducing cross-link density led to an increase in toluene swelling, while heptane uptake remained relatively low and constant. Interestingly, differences in toluene and heptane diffusion coefficients exhibited a maximum at intermediate cross-link density. It is hypothesized that a fully cross-linked network has a mesh size small enough to impede transport, while lower cross-link densities allow toluene to swell the system to a greater extent, in contrast to heptane. The interplay of diffusion and solubility effects lead to a nonmonotonic trend in selectivity, which will inform the design of membranes as effective organic liquid separations media.

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Cross-linked, polyurethane-based, ammonium poly(ionic liquid)/ionic liquid composite films for organic vapor suppression and ion conduction

Cited by 17 publications

References 55 publications

A Review on Ionic Liquid Gas Separation Membranes

A Review on Ionic Liquid Gas Separation Membranes

Poly(ionic liquid)s: Platform for CO2 capture and catalysis

Molecular Design of Precise Network Polymerized Ionic Liquid Membranes for Toluene/Heptane Separations

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