Multi-block copolymers with fluorene-containing hydrophilic segments densely functionalized by side-chain quaternary ammonium groups as anion exchange membranes

Li, Liuhong; Yu-bao, XI; Wu, Wenjun; Yan, Wuxin; Zeng, Mingjian; Zhou, You; Liao, Shijun; Li, Xiuhua

doi:10.1039/c6ra04989c

Cited by 13 publications

(5 citation statements)

References 44 publications

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“…According to the Arrhenius equation, a linear function of ln σ versus 1000/ T is made, as shown in Figure b, It was found that the activation energy decreased sequentially with the increase of the cation grafting ratio, and the activation energies of the membranes for each grafting ratio were 16.7–21.28 kJ·mol –1 , which were all within the range of the activation energies of the membranes reported in the literature. − The smaller the activation energy, the less energy is required to transport ions, so the ionic conductivity increases, which is also consistent with the above result that the conductivity increases sequentially with the increase of the cation graft ratio.…”

Section: Resultssupporting

confidence: 79%

Anion Exchange Membranes Based on Styrene–Ethylene/Butene–Styrene Consist of Two Grafting Forms: N Heterocyclic Cations with Alkyl Intervals and Flexible Long Hydrophobic Side Chains

Wang

Zhang

Sang

et al. 2023

ACS Appl. Energy Mater.

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In view of the problems of poly(styrene–ethylene/butene–styrene) (SEBS) being difficult to dissolve and poor mechanical properties, a series of SEBS-C16D60-DMHP-X (X represents the cationic graft ratio, 20–40%) anion exchange membranes (AEMs) have been prepared. Graft hydrophobic long chains were applied onto the SEBS skeleton to change its solubility, introducing hydrophobic long chains to help construct microphase separation structures and improve ion conductivity (up to 110.22 mS cm–1). The combination of the rigid ring structure in the ring cation with an alkyl spacer and the toughness of the SEBS skeleton, as well as the free folding of alkyl chains, greatly improved the mechanical properties of the AEM, and the swelling ratio of the membrane is well controlled (25.31%, at 80 °C). The alkaline resistance (conductivity decreased only 10.29% after 1400 h of immersion at 80 °C in 2 M NaOH solution) also continuously increased. The structure of this AEM will provide a very meaningful reference for the development of AEMs.

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Section: Resultssupporting

confidence: 79%

Anion Exchange Membranes Based on Styrene–Ethylene/Butene–Styrene Consist of Two Grafting Forms: N Heterocyclic Cations with Alkyl Intervals and Flexible Long Hydrophobic Side Chains

Wang

Zhang

Sang

et al. 2023

ACS Appl. Energy Mater.

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“…Noting that the water uptakes and swelling ratios of the 4C‐60‐Q membrane at varying temperatures are much higher, we calculate the number of bonded water per ammonium group (denoted as λ in Table ) of the x C‐ y ‐Q membranes to research the structure–activity relationship. The λ values ranged from 16.8 to 177.4, higher than most of the reported λ values at the same temperature . The parameters of PAES‐Q‐90, the asymmetric side‐chain‐type membrane, we reported previously are also listed in Table for comparison.…”

Section: Resultsmentioning

confidence: 83%

“…We have reported previously that the hydroxide ion conductivity, mechanical properties, and alkaline stability of the AEMs could be enhanced by introducing benzyltrimethyl ammonium side chain to the polymer backbone . Wang et al also reported a series of side‐chain‐type AEMs containing multiple quaternary ammonium groups based on a new monomer with four pendent 3,5‐dimethylphenyl groups.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Properties of Symmetric Side‐Chain Quaternized Poly(Arylene Ether Sulfone)s for Anion Exchange Membrane Fuel Cells

Wei

Feng

et al. 2017

Macro Chemistry & Physics

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Poly(arylene ether sulfone)s containing symmetric side‐chain benzyltrimethyl ammonium groups are synthesized via Suzuki reaction, copolycondensation, and functionalization. Two series of anion exchange membranes, 4C‐y‐Q and 8C‐y‐Q, containing four or eight pendent benzyl or cationic groups are synthesized to clarify the steric effect of the benzyl groups on the water channels. 1H NMR and transmission electron microscopy are used to study the chemical structure and morphology, respectively. These two series of membranes are assessed in terms of ion exchange capacity (IEC), water uptake, swelling ratio, λ, hydroxide ion conductivity (σ ), mechanical properties, thermal stability, and alkaline stability. The 4C‐y‐Q membranes show better‐defined microphase separation morphology and higher ion conductivity (206.2 mS cm−1 at 80 °C) than most of the reported membranes. Ionic conduction efficiency (σ/IEC) can be improved and made higher than that of Nafion with lower ion transport activation energy. The obtained membranes with superior properties reveal their prospective application in anion exchange membrane fuel cells.

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“…Multiblock is another type of copolymer architecture that has been shown to produce phase-separated membranes. − An advantage of designing multiblock hydrophilic–hydrophobic copolymers is that high molecular weight copolymers can be prepared from a range of molecular weights in the component materials. Research conducted on multiblock polysulfone (PSf) materials has produced copolymers from a variety of bisphenol monomers. − Manipulation of the multiblock composition and the molecular weight of the component segments can tune the microphase separation .…”

Section: Introductionmentioning

confidence: 99%

Effect of Block Length on the Properties of Multiblock Polysulfone-Poly(diallylpiperidinium hydroxide) Anion Exchange Membranes

et al. 2023

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Research in anion exchange membranes (AEM)s has continued with the development of materials bearing base stable cations. Designing AEMs that microphase separate into hydroxide conductive, hydrophilic domains within a hydrophobic and mechanically robust matrix has been shown to be successful for improving AEM performance. A series of multiblock polysulfone-poly(diallylpiperidinium hydroxide) copolymers (PSf-PDApipOH) of similar hydrophobic/hydrophilic composition was prepared in which the molecular weight of the hydroxide conducting PDApipOH segments was varied. The variable hydrophilic segment molecular weight was designed to assess the impact on microphase separation, hydroxide conductivity, and water management. The multiblock copolymers investigated were prepared by condensation polymerization of preformed 4-fluorophenyl sulfone terminated poly(diallylpiperidinium hexafluorophosphate) (PDApipPF6) oligomers with polysulfone monomers. The structure–property relationship between the molecular weight of the conductive PDApipOH segments and AEM performance was demonstrated by evaluation of the microphase separation, water uptake, and hydroxide conductivity. Membranes fabricated from the polysulfone-poly(diallylpiperidinium hexafluorophosphate) (PSf-PDApipPF6) multiblock copolymers were shown to form well-connected conductive domains by SAXS and atomic force microscopy experiments. The PSf-PDApipOH membranes were highly conductive with the maximum hydroxide conductivity reaching 62.9 mS·cm–1 at 60 °C and 95% relative humidity. Furthermore, it was demonstrated that the conductivity increased with increasing PDApipOH segment molecular weight.

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Multi-block copolymers with fluorene-containing hydrophilic segments densely functionalized by side-chain quaternary ammonium groups as anion exchange membranes

Abstract: Design and fabrication of multi-block anion exchange membranes with fluorene-containing hydrophilic segments densely functionalized by side-chain quaternary ammonium groups.

Cited by 13 publications

References 44 publications

Anion Exchange Membranes Based on Styrene–Ethylene/Butene–Styrene Consist of Two Grafting Forms: N Heterocyclic Cations with Alkyl Intervals and Flexible Long Hydrophobic Side Chains

Anion Exchange Membranes Based on Styrene–Ethylene/Butene–Styrene Consist of Two Grafting Forms: N Heterocyclic Cations with Alkyl Intervals and Flexible Long Hydrophobic Side Chains

Synthesis and Properties of Symmetric Side‐Chain Quaternized Poly(Arylene Ether Sulfone)s for Anion Exchange Membrane Fuel Cells

Effect of Block Length on the Properties of Multiblock Polysulfone-Poly(diallylpiperidinium hydroxide) Anion Exchange Membranes

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