Highly stable anion exchange membranes based on quaternized polypropylene

Zhang, Min; Liu, Jinling; Wang, Yiguang; An, Linan; Guiver, Michael D.; Li, Nanwen

doi:10.1039/c5ta01420d

Cited by 152 publications

(125 citation statements)

References 42 publications

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“…However, it is difficult to establish a clear relationship between σ and IEC as for both counter‐ions a plateau value seems to be reached above ca IEC NMR‐OH = 1.5 meq g −1 independently of the chemical nature of the diazide monomer while the corresponding WU values range from 27% to 144%, suggesting that the increase of ionic content onto the polymer chain is counterbalanced by its dilution into the hydrated membrane. Comparable evolutions in this range of IEC values were previously observed for quaternary ammonium hydroxide based AEMs . Yet, the 10‐fold increase in σ for hydroxide anions compared to iodide anions is in good agreement with the literature and confirms the larger mobility of the hydroxide anions .…”

Section: Resultssupporting

confidence: 89%

Main‐chain poly(1,2,3‐triazolium hydroxide)s obtained through AA+BB click polyaddition as anion exchange membranes

Flachard

Serghei

Fumagalli

et al. 2019

Polymer International

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A series of aromatic poly(1,2,3‐triazolium iodide)s were synthesized by step growth polymerization of dipropargyl bisphenol A with aliphatic and aromatic diazides followed by quantitative or partial N‐alkylation of the main‐chain 1,2,3‐triazole groups using iodomethane. After characterization by 1H NMR spectroscopy, SEC and DSC the corresponding self‐standing membranes were obtained by hot pressing. Poly(1,2,3‐triazolium iodide) membranes were converted to the corresponding hydroxide‐containing membranes by anion exchange. Structure–property correlations are discussed based on the evolution of water uptake and ionic conductivity with respect to the ionic exchange capacities of the different materials having distinct chemical structure, quaternization degree and counter‐anion structure. Poly(1,2,3‐triazolium hydroxide) anion exchange membranes exhibit water uptakes below 150% and ionic conductivity in the hydrated state up to 4 mS cm−1 for ionic exchange capacities up to 3.2 meq g−1. © 2019 Society of Chemical Industry

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Section: Resultssupporting

confidence: 89%

Main‐chain poly(1,2,3‐triazolium hydroxide)s obtained through AA+BB click polyaddition as anion exchange membranes

Flachard

Serghei

Fumagalli

et al. 2019

Polymer International

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“…Semicrystalline polypropylene (PP) carrying QA groups on hexadecyl spacers have been prepared by Zhang et al via heterogeneous Ziegler–Natta catalyzed polymerizations (Scheme d) . Films of bromoalkyl functionalized PP were prepared by melt‐pressing before quaternization to prepare the AEMs.…”

Section: Aems Based On Cationic Polymers With Different Side Chain Comentioning

confidence: 99%

“…Thermally cross‐linked AEMs maintained a high OH − conductivity at 57 mS cm −1 despite a low water uptake (21 wt%). The membranes retained more than 85% of their OH − conductivity after storage in 5 or 10 m NaOH at 80 °C during 700 h, indicating a high alkaline stability . Still, PP is generally sensitive toward oxidative degradation occurring at the tertiary carbon atoms present in every repeat unit, which may bring limitations.…”

Section: Aems Based On Cationic Polymers With Different Side Chain Comentioning

confidence: 99%

Configuring Anion‐Exchange Membranes for High Conductivity and Alkaline Stability by Using Cationic Polymers with Tailored Side Chains

Jannasch

Weiber

2016

Macro Chemistry & Physics

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Polymeric anion-exchange membranes (AEMs) are critical components for alkaline membrane fuel cells (AMFCs) which offer several attractive advantages including the use of platinumfree catalysts and a wide choice of fuel. The development of AMFCs and other electrochemical energy systems is currently severely limited by the lack of AEMs with suffi cient alkaline stability. Still, signifi cant advances have been made in recent years and one of the most promising approaches to emerge is the design and synthesis of cationic polymers with various side chain arrangements. Especially, synthetic strategies where the cationic ionexchange groups are placed on pendant alkyl spacer chains along the backbone seem to signifi cantly improve microphase separation, hydroxide ion conductivity, and alkaline stability in relation to standard AEMs with cations placed in benzylic positions directly on the backbone. This article reviews recent approaches to high-performance cationic membrane polymers involving different side chain designs, and discusses some possible future directions.

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“…[1][2][3][4][5][6][7] They have been used in ar ange of technologies,s uch as anionexchange resins, [8] hydrogen fuel cells, [1,9,10] water electrolyzers, [11] redox-flow batteries, [12] and reverse dialysis. [1][2][3][4][5][6][7] They have been used in ar ange of technologies,s uch as anionexchange resins, [8] hydrogen fuel cells, [1,9,10] water electrolyzers, [11] redox-flow batteries, [12] and reverse dialysis.…”

mentioning

confidence: 99%

Poly(phenylene) and m‐Terphenyl as Powerful Protecting Groups for the Preparation of Stable Organic Hydroxides

2016

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Four benzimidazolium hydroxide compounds, in which the C2-position is attached to a phenyl group possessing hydrogen, bromine, methyl groups, or phenyl groups at the ortho positions, are prepared and investigated for stability in a quantitative alkaline stability test. The differences between the stability of the various protecting groups in caustic solutions are rationalized on the basis of their crystal structures and DFT calculations. The highest stability was observed for the m-terphenyl-protected benzimidazolium, showing a half-life in 3 M NaOD/CD3OD/D2O at 80 °C of 3240 h. A high-molecular-weight polymer analogue of this model compound is prepared that exhibits excellent mechanical properties, high ionic conductivity and ion-exchange capacity, as well as remarkable hydroxide stability in alkaline solutions: only 5% degradation after 168 h in 2 M KOH at 80 °C. This is the most stable hydroxide-conducting benzimidazolium polymer to date.

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Highly stable anion exchange membranes based on quaternized polypropylene

Abstract: “Side-chain-type” and crosslinkable quaternized polypropylene was prepared by heterogeneous Ziegler–Natta catalyst mediated polymerization for use in highly stable anion exchange membranes.

Cited by 152 publications

References 42 publications

Main‐chain poly(1,2,3‐triazolium hydroxide)s obtained through AA+BB click polyaddition as anion exchange membranes

Main‐chain poly(1,2,3‐triazolium hydroxide)s obtained through AA+BB click polyaddition as anion exchange membranes

Configuring Anion‐Exchange Membranes for High Conductivity and Alkaline Stability by Using Cationic Polymers with Tailored Side Chains

Poly(phenylene) and m‐Terphenyl as Powerful Protecting Groups for the Preparation of Stable Organic Hydroxides

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