Fundamental studies of a new series of anion exchange membranes: Membranes prepared from bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) and pyridine

Li, Yuan; Xu, Tongwen; Gong, Mali

doi:10.1016/j.memsci.2005.12.006

Cited by 78 publications

(32 citation statements)

References 23 publications

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“…3d and Fig. 3e, for the GPPO analogues, new characteristic peaks at 1567 cm -1 and 1677 cm -1 were attributed to the C-N and C=N stretching vibration respectively [17,26] and confirmed the presence of guanidinium groups; the new broad peaks at 3415 cm -1 were attributed to the -OH stretching vibrations [28]. The degree of conversion was 100% as confirmed by the disappearance of the C-Br peak at 743 cm -1 .…”

Section: Ft-irmentioning

confidence: 75%

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Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells

Lin

Liu

et al. 2012

Journal of Power Sources

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Section: Ft-irmentioning

confidence: 75%

“…Fig. 3a presents the spectrum of PPO, where the bands at 1610 cm -1 and 1471 cm -1 were assigned to the phenyl group vibrations [26]. New characteristic peaks at 743 cm −1 were observed at Fig.…”

Section: Ft-irmentioning

confidence: 99%

Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells

Lin

Liu

et al. 2012

Journal of Power Sources

Self Cite

161

100

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“…48 Additionally, the signal for C-Br stretching in bromobenzyl groups, expected at 740 to 750 cm −1 , was not observed in the FTIR spectra of the CMPPOderived AEMs. 46 Table S1) are given in the ESI section. However, the hypothesis of incomplete ionexchange seems to be invalid based on the results (i.e., a single stage extraction was sufficient for a near complete ion-exchange).…”

Section: 47mentioning

confidence: 99%

Mechanically Stable Poly(arylene ether) Anion Exchange Membranes Prepared from Commercially Available Polymers for Alkaline Electrochemical Devices

Arges

Wang

Jung

et al. 2015

J. Electrochem. Soc.

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The alkaline stability of poly(arylene ether) backbones in anion exchange polymer electrolyte membranes (AEMs) derivatized with quaternary benzyl N, N-dimethylhexylammmonium (DMH + ) and trimethylammonium (TMA + ) cation groups were investigated in poly(2,6-dimethyl 1,4-phenylene) oxide (PPO) and Udel polysulfone (PSF) polymers. Previous studies have demonstrated that quaternary ammonium and phosphonium groups trigger backbone degradation in commercially available poly(arylene ether)-based AEMs, despite the base polymers being resilient to alkaline solutions. Herein, we demonstrate that the electron withdrawing or donating character in the poly(arylene ether) backbone ultimately decides whether or not the prepared AEMs will become brittle in alkaline media due to cation triggered backbone degradation. Mitigation of cation triggered backbone degradation was only achieved when electron withdrawing substituents (not including the cation), such as sulfone or bromine groups, were eliminated from the polymer backbone (or, alternately, when electron donating groups were present). Hence, PPO AEMs prepared through chloromethylation, as opposed to free radical bromination, were resistant to backbone hydrolysis in alkaline media because each cation-functionalized repeat unit had two electron donating methyl groups rather than a single methyl group. In summary, this paper presents some design rules for preparing mechanically stable poly(arylene ether) AEMs from low cost, commercially available polymers for alkaline electrochemical devices.

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“…However, it remains difficult to scale-up this type of chemistry despite recent promising progress. [18][19][20] Research by Xu, 21 Hibbs, 22 Holdcroft, 23 Jannasch, 24 Bae, 25 Li, 26 and others have pushed a plethora of new anion exchange membranes into the community (see Fig. 2).…”

Section: Modern History Of Aems For Electrochemical Devicesmentioning

confidence: 99%

Strategies for Developing New Anion Exchange Membranes and Electrode Ionomers

Hickner

2017

Electrochem. Soc. Interface

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The synthesis of new cationic polymers has accelerated the electrochemical field forward towards emerging anion exchange membrane enabled devices. Due to the lack of standard materials for cell testing and optimization, in addition to the absence of a satisfactory commercial anion exchange membranes capable of high current density for electrochemical devices, research groups are aggressively engaged in synthesizing new membrane materials and electrode ionomers. These materials are seen as critical components for the success of precious metal-free alkaline fuel cells and water electrolyzers, advanced flow batteries, CO2 reduction electrolysis cells, and other advanced electrochemical devices. For decades Nafion, and its many PFSA-type variants, have facilitated the advancement of many membrane-based electrochemical devices—in most cases operated in acidic media. However, no such standard material exists for anion exchange membranes. This article will discuss the recent evolution of anion exchange membranes geared towards electrochemical technology and point to some key breakthroughs in this field to date.

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Fundamental studies of a new series of anion exchange membranes: Membranes prepared from bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) and pyridine

Cited by 78 publications

References 23 publications

Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells

Alkali resistant and conductive guanidinium-based anion-exchange membranes for alkaline polymer electrolyte fuel cells

Mechanically Stable Poly(arylene ether) Anion Exchange Membranes Prepared from Commercially Available Polymers for Alkaline Electrochemical Devices

Strategies for Developing New Anion Exchange Membranes and Electrode Ionomers

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