Anion conducting multiblock poly(arylene ether sulfone)s containing hydrophilic segments densely functionalized with quaternary ammonium groups

Weiber, Annika; Meis, David; Jannasch, Patric

doi:10.1039/c4py01588f

Cited by 80 publications

(45 citation statements)

References 36 publications

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“…Moreover, the limited ion dissociation and possible anhydride formation may bring about decreased connectivity of the water channels, as suggested by the SAXS study. A similar phenomenon was also found for a block AEM system reported by Jannasch and co‐workers . The anionic conductivity decreased on increasing the number of QA groups per benzene ring from 2 to 4 at a given IEC, mostly because of the reduced ion dissociation with the increasing proximity of the QA groups.…”

Section: Nanostructured Polymer Membranessupporting

confidence: 84%

Nanostructured Ion‐Exchange Membranes for Fuel Cells: Recent Advances and Perspectives

et al. 2015

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Polymer-based materials with tunable nanoscale structures and associated microenvironments hold great promise as next-generation ion-exchange membranes (IEMs) for acid or alkaline fuel cells. Understanding the relationships between nanostructure, physical and chemical microenvironment, and ion-transport properties are critical to the rational design and development of IEMs. These matters are addressed here by discussing representative and important advances since 2011, with particular emphasis on aromatic-polymer-based nanostructured IEMs, which are broadly divided into nanostructured polymer membranes and nanostructured polymer-filler composite membranes. For each category of membrane, the core factors that influence the physical and chemical microenvironments of the ion nanochannels are summarized. In addition, a brief perspective on the possible future directions of nanostructured IEMs is presented.

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Section: Nanostructured Polymer Membranessupporting

confidence: 84%

Nanostructured Ion‐Exchange Membranes for Fuel Cells: Recent Advances and Perspectives

et al. 2015

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“…By comparing the 1 H NMR spectra before and after the treatment we concluded that virtually all Im groups were lost (see Supporting Information, Figure S3). We recently reported on the loss of ~80% of the QA groups of a PAES AEM under the same testing conditions [32]. As a consequence, we have investigated the water uptake and ion conductivity of the present AEMs in the Br -form rather than in the OH -form.…”

Section: Water Uptake and Ion Conductivitymentioning

confidence: 96%

Polysulfones with highly localized imidazolium groups for anion exchange membranes

Weiber

Jannasch

2015

Journal of Membrane Science

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“…Strategies to obtain AEM with ion channels include locating ion-conducting groups at the ends of polymer side chains, synthesizing polymer main chains using multiblock co-polymers containing regions of ion-conducting groups [86,87], monomers with densely functionalized ion-conducting regions on the main chains [88] or separately attaching the hydrophobic side change and ion-conducting group to the polymer backbone [89]. Work by Pan et al and Weiber et al shows that increasing the number of QA groups in the block copolymer or the hydrophobic side chain length improved the membrane's IEC to a certain point, after which the IEC decreased with additional QA groups or chain length [86,89]. This was likely due to the QA group proximity (limited ion-dissociating ability) and the over-assembly of ion clusters that resulted in separate ion-conducting regions.…”

Section: Advancements In Aem Polymer Structurementioning

confidence: 99%

A review of the synthesis and characterization of anion exchange membranes

2018

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This review highlights advancements made in anion exchange membrane (AEM) head groups, polymer structures and membrane synthesis methods. Limitations of current analytical techniques for characterizing AEMs are also discussed. AEM research is primarily driven by the need to develop suitable AEMs for the high-pH and high-temperature environments in anion exchange membrane fuel cells and anion exchange membrane water electrolysis applications. AEM head groups can be broadly classified as nitrogen based (e.g. quaternary ammonium), nitrogen free (e.g. phosphonium) and metal cations (e.g. ruthenium). Metal cation head groups show great promise for AEM due to their high stability and high valency. Through ''rational polymer architecture'', it is possible to synthesize AEMs with ion channels and improved chemical stability. Heterogeneous membranes using porous supports or inorganic nanoparticles show great promise due to the ability to tune membrane characteristics based on the ratio of polymer to porou2s support or nanoparticles. Future research should investigate consolidating advancements in AEM head groups with an optimized polymer structure in heterogeneous membranes to bring together the valuable characteristics gained from using head groups with improved chemical stability, with the benefits of a polymer structure with ion channels and improved membrane properties from using a porous support or nanoparticles. AbbreviationsAAEM Alkaline anion exchange membrane AEM Anion exchange membrane AEMFC Anion exchange membrane fuel cell AEMWE Anion exchange membrane water electrolysis CEM Cation exchange membrane DSC Differential scanning calorimetry IEC Ion exchange capacity (mmol/g) IEM Ion exchange membrane PEMFC Proton exchange membrane fuel cell

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Anion conducting multiblock poly(arylene ether sulfone)s containing hydrophilic segments densely functionalized with quaternary ammonium groups

Abstract: The use of methylhydroquinones enables the preparation of block copolymers having phenylene rings with precisely 2, 3 or 4 quaternary ammonium groups. Membrane properties show the importance of controlling the local ionic distribution to reach high anion conductivity.

Cited by 80 publications

References 36 publications

Nanostructured Ion‐Exchange Membranes for Fuel Cells: Recent Advances and Perspectives

Nanostructured Ion‐Exchange Membranes for Fuel Cells: Recent Advances and Perspectives

Polysulfones with highly localized imidazolium groups for anion exchange membranes

A review of the synthesis and characterization of anion exchange membranes

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