High Toughness, High Conductivity Ion Gels by Sequential Triblock Copolymer Self-Assembly and Chemical Cross-Linking

Gu, Yuanyan; Zhang, Sipei; Martinetti, Luca; Lee, Keun Hyung; McIntosh, Lucas D.; Frisbie, C. Daniel; Lodge, Timothy P.

doi:10.1021/ja4051394

Cited by 182 publications

(196 citation statements)

References 48 publications

(67 reference statements)

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“…1,2 ILs have been demonstrated as attractive reaction media or enabling components for a wide variety of applications, including Suzuki reactions, 3 polymerizations, 4 acid scavenging (e.g. [15][16][17][18][19] In recent years, commercialization of some of these processes has been initiated by major chemical companies as well as by new, IL-focused startups, with several pilot plants already constructed. [15][16][17][18][19] In recent years, commercialization of some of these processes has been initiated by major chemical companies as well as by new, IL-focused startups, with several pilot plants already constructed.…”

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confidence: 99%

Spectroscopic determination of relative Brønsted acidity as a predictor of reactivity in aprotic ionic liquids

2015

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confidence: 99%

Spectroscopic determination of relative Brønsted acidity as a predictor of reactivity in aprotic ionic liquids

2015

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“…They also reported a high-toughness ion gel with 10 wt % triblock copolymer, which was prepared by crosslinking reactions in the IL. 5 The electrical conductivity is about 2/3 that of the neat IL because the ionic mobility is obstructed by the nonconductive part in their ion gel. Kamio et al…”

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confidence: 99%

Carbon Dioxide Separation Using a High-toughness Ion Gel with a Tetra-armed Polymer Network

et al. 2014

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A high-performance CO 2 separation membrane consisting of an ion gel has been prepared. The tetra-armed poly(ethylene glycol) ion gel contains a large fraction of ionic liquid (94 wt %) and shows excellent CO 2 permselectivity over a wide temperature range, up to 100°C. We also demonstrate that the ion gel can absorb CO 2 without solvent seeping at a high pressure of 3 MPa.Room-temperature ionic liquids (ILs) have been widely applied to electrochemical, synthetic, and separation processes as green solvents due to their unique properties such as nonvolatility, nonflammability, good thermal stability, and high ionic conductivity. ILs are recognized as designable solvents, and their structural diversity enables us to control their solvent properties, for example, the miscibility with various chemicals such as metal ions, synthesized and biological polymers, and acidic gases. In the last decade, CO 2 absorption and separation technologies using ILs have attracted much attention, because CO 2 is highly soluble in ILs relative to other neutral gases like N 2 , H 2 , and CH 4 . A large number of investigations have been performed until now to improve the CO 2 absorption properties since the first report on the high solubility of CO 2 in the dialkylimidazolium-based IL.1 A membrane separation process generally requires smaller operational energy, lower running cost, and smaller equipment footprint compared with an absorption process. The supported IL membranes (SILMs), i.e., polymeric or inorganic porous materials filled with ILs, show comparable or higher permeabilities and selectivities of CO 2 than conventional polymeric membranes.2 SILMs have a higher long-term stability than supported membranes with organic solvents, because of nonvolatility and high thermal stability of ILs. However, SILMs cannot hold ILs under pressurized conditions, which is a serious disadvantage for the gas separation membrane. Polymeric ILs, i.e., self-crosslinking ILs were also applied as CO 2 separation membranes.3 However, it was pointed out that their separation performances are inferior to those of the SILMs due to the limited CO 2 diffusion in their rigid polymer matrix. Therefore, ion gels with a low polymer content and/or a high fraction of "free" IL content are more favorable materials for CO 2 separation membrane.Recently, some research groups reported the CO 2 separation performances of ion gels with relatively low polymer contents. . They also reported a high-toughness ion gel with 10 wt % triblock copolymer, which was prepared by crosslinking reactions in the IL. 5 The electrical conductivity is about 2/3 that of the neat IL because the ionic mobility is obstructed by the nonconductive part in their ion gel. Kamio et al.4d reported a CO 2 N 2 separation membrane using poly(vinylpyrrolidone)-based ion gels containing 5070 wt % amino acid IL, and the ion gel shows a compression breaking stress of 1 MPa at 70 wt % IL content. They demonstrated that both CO 2 permeability and selectivity are significantly improved with increasing IL ...

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“…The novel ion-gel ink is designed to enable ink-jet printing of chemically crosslinked ion-gels and to avoid complex synthesis processes such as annealing, [19] UV-curing, [15,21] and reversible addition-fragmentation chain transfer (RAFT) polymerization. [12][13][14] To ensure ink-jet printability, it is crucial to properly inhibit or promote self-assembled gelation of the ingredients, poly(vinyl alcohol) (PVA) and poly(ethylene-alt-maleic anhydride) (PEMA), because the functional groups of PVA and PEMA easily react even at room temperature in a concentrated solution, forming a rigid CC gel, which cannot be applied for ink-jet printing (Figure 1a).…”

Section: Resultsmentioning

confidence: 99%

“…Especially, electrolyte-gated transistors (EGTs) have been in the focus of interest, because of the possibility to use low electrochemi cal stability, and also can derive high capacitance by forming the ELDs with ionic liquid at the interface between electrolyte and electrode. For these reasons, studies on CC ion-gels have almost only focused on material developments, such as finding new synthesis methods [19][20][21] or improving the physical properties and ionic conductivities. The PC ion-gels reveal a physically crosslinked structure, which usually consists of entanglement of macromolecule chains, whereas the CC ion-gel has a covalent bonded crosslinked structure.…”

Section: Introductionmentioning

confidence: 99%

Ink‐Jet Printable, Self‐Assembled, and Chemically Crosslinked Ion‐Gel as Electrolyte for Thin Film, Printable Transistors

Jeong

Marques

Feng

et al. 2019

Adv Materials Inter

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voltages for operation [1][2][3][4][5][6][7] and remarkable progress has been made in the development of semiconducting channel materials [8][9][10][11] and gate insulators. [12][13][14] The EGTs are switched on/off by applying a gate potential, which leads to a migration and local redistribution of ions at the semiconductor/electrolyte interfaces. The formed electric double layer (EDL) generates high charge accumulation in the adjacent semiconducting channel, which, for instance, renders the channel conductive at a certain gate potential. For this reason, it is important for gate insulators to show high ionic conductivities, in order to quickly develop strong EDLs that improve the EGT performance. However, the switching speed of EGTs, which is slower than that for dielectric gating, is still considered as a technical hurdle for practical applications. Therefore, various types of advanced polymer electrolytes have been intensively studied.A different approach has been established in the last few years, where an ion-gel, consisting of an ionic liquid and a poly mer, is used as a gate insulator in EGTs. [14][15][16] This approach makes use of the intrinsic properties of ionic liquids, such as high ionic conductivities, negligible volatility, and Electrolyte-gated transistors (EGTs) represent an interesting alternative to conventional dielectric-gating to reduce the required high supply voltage for printed electronic applications. Here, a type of ink-jet printable ion-gel is introduced and optimized to fabricate a chemically crosslinked ion-gel by selfassembled gelation, without additional crosslinking processes, e.g., UV-curing. For the self-assembled gelation, poly(vinyl alcohol) and poly(ethylene-altmaleic anhydride) are used as the polymer backbone and chemical crosslinker, respectively, and 1-ethyl-3-methylimidazolium trifluoromethanesulfonate ([EMIM][OTf ]) is utilized as an ionic species to ensure ionic conductivity. The as-synthesized ion-gel exhibits an ionic conductivity of ≈5 mS cm −1 and an effective capacitance of 5.4 µF cm −2 at 1 Hz. The ion-gel is successfully employed in EGTs with an indium oxide (In 2 O 3 ) channel, which shows on/offratios of up to 1.3 × 10 6 and a subthreshold swing of 80.62 mV dec −1 .

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High Toughness, High Conductivity Ion Gels by Sequential Triblock Copolymer Self-Assembly and Chemical Cross-Linking

Cited by 182 publications

References 48 publications

Spectroscopic determination of relative Brønsted acidity as a predictor of reactivity in aprotic ionic liquids

Spectroscopic determination of relative Brønsted acidity as a predictor of reactivity in aprotic ionic liquids

Carbon Dioxide Separation Using a High-toughness Ion Gel with a Tetra-armed Polymer Network

Ink‐Jet Printable, Self‐Assembled, and Chemically Crosslinked Ion‐Gel as Electrolyte for Thin Film, Printable Transistors

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