Dual-cation comb-shaped anion exchange membranes: Structure, morphology and properties

He, Yubin; Si, Jiaojiao; Wu, Liang; Chen, Shengli; Zhu, Yuan; Pan, Jing; Ge, Xiaolin; Yang, Zhengjin; Xu, Tongwen

doi:10.1016/j.memsci.2016.05.058

Cited by 76 publications

(30 citation statements)

References 35 publications

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“…The formation of better nanophase‐separated morphology explains this phenomenon. The well‐connected three‐dimensional hydrophobic network may lead to higher flexibility of the AEM . Figure is a photographic image of the folded QA‐PS 120 ‐ b ‐PDVPPA 80 ‐based AEMs, showing the excellent flexibility and transparent appearance typical of the present AEMs.…”

Section: Resultsmentioning

confidence: 94%

“…However, the hydroxide conductivities were not enhanced. According to He's research, the nanophase separation ability of AEM is not the only factor that determines the hydroxide conductivity of AEMs; the density of ion conducting groups in the ion conducting channels also has profound influence on the hydroxide conductivity of AEMs. After introducing a long aliphatic tail, better nanophase separation was achieved, but the cation density in the ionic cluster decreased, and this resulted in slightly lower hydroxide conductivity.…”

Section: Resultsmentioning

confidence: 99%

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Comb‐shaped diblock copolystyrene for anion exchange membranes

Zhu

Zhang

et al. 2018

J of Applied Polymer Sci

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To improve the properties of diblock copolystyrene-based anion exchange membranes (AEMs), a series of AEMs with comb-shaped quaternary ammonium (QA) architecture (QA-PS m -b-PDVPPA n -xC where x denotes the number of carbon atoms in different alkyl tail chains and has values of 1, 4, 8, and 10 and C denotes carbon) were designed and synthesized via subsequent quaternization reactions with three different alkyl halogens (methyl iodide and N-alkane bromines (CH 3 [CH 2 ] x-1 Br where x = 4, 8, and 10). Compared with triblock analogues quaternized with methyl iodide in our previous research, QA-PS m -b-PDVPPA n -xC (x = 4, 8, and 10) AEMs are more flexible with the introduction of a long alkyl tail chain; this probably impedes crystallization of the rigid polystyrenebased main chain and induces sterically adjustable ionic association. An increase in the pendant alkyl tail chain length generally led to enhanced microphase separation of the obtained AEMs, and this was confirmed using small-angle X-ray scattering and atomic force microscopy. The highest conductivity (25.5 mS cm −1 ) was observed for QA-PS 120 -b-PDVPPA 80 -10C (IEC = 1.94 meq g -1 ) at 20 C. Furthermore, the water uptake (<30%) and swelling ratio (<13.1%) of QA-PS m -b-PDVPPA n -xC AEMs are less than half of these corresponding values for their triblock counterparts. The QA-PS 120 -b-PDVPPA 80 -10C membrane retained a maximum stability that was as high as 86.8% of its initial conductivity after a 40-day test (10 M NaOH, 80 C), and this was probably because of the steric shielding of the cationic domains that were surrounded by the longest alkyl tail chains. .47370 para-substituted styrenic AEMs based on quaternary ammonium (QA) are significantly more stable than their QA-functionalized poly(phenylene oxide) and ortho-substituted poly(arylene ether sulfone) counterparts. A large variety of different cationic groups Additional Supporting Information may be found in the online version of this article.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Comb‐shaped diblock copolystyrene for anion exchange membranes

Zhu

Zhang

et al. 2018

J of Applied Polymer Sci

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“…It is considered that the nitrile groups with strong polarity could strengthen the intra/interchain interaction and thus restrict the water absorption and membrane swelling. 46,49 A comparison of the swelling ratio of CCPENS-x membranes with some random-type AEMs, 16,18 block-type AEMs, 27,29,31 sidechain-type AEMs 32,34,35 and comb-shaped AEMs [38][39][40] is shown in Fig. 3, as a function of IEC at 80 C. The CCPENS-x membranes displayed a lower swelling ratio at a moderate level of IEC, which reveals that the AEMs have good dimensional stabilities and anti-swelling properties.…”

Section: Iec Wu and Sr Of The Aemmentioning

confidence: 99%

“…In addition, inspired by Naon® structure, many researchers were interested in comb-shaped AEMs, where ion exchange groups graed or beside on the long exible side chains. [37][38][39][40][41] In these comb-shaped AEMs, nano-scale ionic clusters were observed to form distinct microphase separation structures. Furthermore, the dimensional and alkaline stability of these AEMs could also be elevated due to the hydrophobicity and steric hindrance effect of long side chains.…”

Section: Introductionmentioning

confidence: 99%

Comb-shaped cardo poly(arylene ether nitrile sulfone) anion exchange membranes: significant impact of nitrile group content on morphology and properties

Lai

Zhu

et al. 2020

RSC Adv.

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“…To further enhance the AEM conductivity, researchers have developed AEMs with densely functionalized side chains [28][29][30][31][32][33]. Generally, a functional side chain with a tertiary amine group and a quaternary ammonium group (TAC6QA) was synthesized via the reaction between N,N,N',N'-tetramethyl-1,6-hexanediamine (TMHDA) and haloalkanes.…”

Section: Introductionmentioning

confidence: 99%

Towards the gemini cation anion exchange membranes by nucleophilic substitution reaction

Zhang

Liang

et al. 2019

Sci. China Mater.

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As a critical component of alkaline fuel cells, anion exchange membranes determine the energy efficiency, output power density and the long term stability. Recently, the anion exchange membranes with gemini-cation side chains exhibit superior ion conductivity due to their good nanophase separation. However, the costly and complicated synthesis limits their scaling up and commercialization. To address this problem, a convenient synthetic procedure under mild conditions is well developed. A tertiary amine precursor is introduced onto the polymer by the nucleophilic substitution reaction to avoid the conventional chloro/bromo-methylation. Followed by a simple Menshutkin reaction with 6bromo-N,N,N-trimethylhexan-1-aminium bromide, the polymer electrolytes are obtained in a high yield. The resulting anion exchange membranes with high conductivity, good fuel cell performance and restricted swelling suggest the potential for the application in fuel cell devices.

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Dual-cation comb-shaped anion exchange membranes: Structure, morphology and properties

Cited by 76 publications

References 35 publications

Comb‐shaped diblock copolystyrene for anion exchange membranes

Comb‐shaped diblock copolystyrene for anion exchange membranes

Comb-shaped cardo poly(arylene ether nitrile sulfone) anion exchange membranes: significant impact of nitrile group content on morphology and properties

Towards the gemini cation anion exchange membranes by nucleophilic substitution reaction

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