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

Lai, Ao Nan; Hu, Peng; Zhu, Rong Yu; Yin, Qiang; Zhou, Shu Feng

doi:10.1039/d0ra01798a

Cited by 9 publications

(6 citation statements)

References 57 publications

(65 reference statements)

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“…The theoretical IEC value of the membrane is calculated from the monomer ratio, and the experimental IEC value is obtained by titrating the amount of fixed hydroxide cations in the polymer matrix with hydrochloric acid aqueous solution, which is defined by the number of moles of cationic groups per unit mass of dry polymer. The IEC values of the copolymers rPES( x / y )-MI vary from 1.91 to 2.31 mequiv g –1 , which are similar to the membranes containing a multiquaternary ammonium pendant ,− but higher than the poly(ether sulfone)-based AEMs with imidazolium groups. − This can be attributed to the effect of the dense but rational distribution of the functional groups. In addition, the IEC values of rPES( x / y )-MI can be controlled by controlling the copolymer composition, which means that the different IECs can be obtained by adjusting the x / y ratio.…”

Section: Resultsmentioning

confidence: 92%

Imidazole-Functionalized Multiquaternary Side-Chain Polyethersulfone Anion-Exchange Membrane for Fuel Cell Applications

Xie

et al. 2022

ACS Appl. Energy Mater.

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A series of rPES(x/y)-MI membranes with different rigid side chains and highdensity imidazole cationic groups have been prepared for anion-exchange membrane (AEM) fuel cells (AEMFC). These AEM rPES(x/y)-MIs with IEC values of 1.91−2.31 mequiv g −1 exhibit high conductivities of 92.92−142.69 mS cm −1 at 80 °C, acceptable water uptake, and dimensional change. Density functional theory (DFT) was used to demonstrate the excellent alkali stability of this class of copolymers, which is consistent with experimental results. In addition, the degradation mechanism of this type of AEM has also been investigated. Significantly, rPES(1/4)-MI-based AEMFC has the maximum power density of 195 mW cm −2 at a current density of 525 mA cm −2 , which is much higher than commercial reference membrane FAS-30 measured in the same environment.

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Section: Resultsmentioning

confidence: 92%

Imidazole-Functionalized Multiquaternary Side-Chain Polyethersulfone Anion-Exchange Membrane for Fuel Cell Applications

Xie

et al. 2022

ACS Appl. Energy Mater.

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“…As depicted in Figure 5d-f, the darker and brighter regions are corresponding to hydrophilic side-chains that hanged quaternary ammonium groups and hydrophobic backbones contained fluorene groups, respectively. 38,39,50,[53][54][55][56][57] The as-prepared membranes based on the block backbones showed defined microphaseseparated structures. Compared with QFPESK-5-10 and QFPESK-10-10, the QFPESK-15-10 presents more and larger interconnected ionic domains and exhibits a developed microphase-separated structure, as well as IEC reflected the amount of DOA group on QFPESK-m-n matrix.…”

Section: Membrane Morphologymentioning

confidence: 96%

Comb‐shaped block poly(arylene ether sulfone ketone)s for anion exchange membranes

Lai,

Li,

Zheng

et al. 2023

J of Applied Polymer Sci

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A well‐designed architecture is presented here to construct high‐performance anion exchange membranes (AEMs). A series of quaternized fluorene‐containing block poly(arylene ether sulfone ketone)s (QFPESK‐m‐n) is synthesized as the main chains, and grafted with comb‐shaped C8 long alkyl chains for the AEMs. By varying the hydrophilic segment’ length, there has been a significant change in the microstructure as well as phase separation morphology of the membranes, as confirmed by atomic force microscopy. Hence the as‐prepared AEMs with moderate ion exchange capacities (IECs) show enhanced hydroxide conductivities in the range of 28.8―94.7 mS⋅cm−1 from 30 to 80°C. Furthermore, based on the block backbones and hydrophobic comb‐shaped alkyl chains, the AEMs show low‐level swelling ratios of 4.3% to 9.2% at 30°C and from 6.2% to 13.2% at 80°C, and superior ratios of conductivity to swelling. In addition, the QFPESK‐m‐n AEMs also depict acceptable mechanical properties, good thermal stability and an optimizable alkaline stability.

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“…Modification of commercial polymers is also widely studied, including the modification of poly(olefins), ,− poly(styrene)s, ,, poly(sulfone)s, − poly(phenylene oxide)s, − and poly(aryl ether ketone). , Introduction of quaternary ammonium onto poly(sulfone)s was studied a lot because the benzene ring on its main chain is prone to chloromethylation. However, the process of chloromethylation needed carcinogenic chloromethyl methyl ether .…”

Section: Introductionmentioning

confidence: 99%

Anion Exchange Membranes Synthesized by Acetalization of Poly(vinyl alcohol) for Fuel Cells

Chen

Yuan

et al. 2022

ACS Appl. Energy Mater.

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High-performance anion exchange membranes (AEMs) are the bottleneck of the commercialization of alkaline AEM fuel cells. Various methods have been developed to prepare AEMs with high ionic conductivity, excellent mechanical properties, and alkaline stability. Among them, modification of various commercial polymers is a facile and effective way. To broaden the category of the commercial polymer-based AEMs, herein, a series of AEMs based on poly(vinyl alcohol) were prepared by acetalization. The PVA–FBMP x –TPA z membrane achieved OH– conductivity up to 200.4 mS cm–1 at 80 °C with appropriate water uptake and a low swelling ratio. Moreover, a high peak power density of 982 mW cm–2 was obtained in a H2/O2 fuel cell test.

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

Abstract: A series of comb-shaped cardo poly(arylene ether nitrile sulfone) (CCPENS-x) materials were synthesized by varying the content of nitrile groups as anion exchange membranes (AEMs).

Cited by 9 publications

References 57 publications

Imidazole-Functionalized Multiquaternary Side-Chain Polyethersulfone Anion-Exchange Membrane for Fuel Cell Applications

Imidazole-Functionalized Multiquaternary Side-Chain Polyethersulfone Anion-Exchange Membrane for Fuel Cell Applications

Comb‐shaped block poly(arylene ether sulfone ketone)s for anion exchange membranes

Anion Exchange Membranes Synthesized by Acetalization of Poly(vinyl alcohol) for Fuel Cells

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