scholarly journals Alkaline Stable Anion Exchange Membranes Based on Cross-Linked Poly(Arylene Ether Sulfone) Bearing Dual Quaternary Piperidines for Enhanced Anion Conductivity at Low Water Uptake

Molecules ◽  
2022 ◽  
Vol 27 (2) ◽  
pp. 364
Author(s):  
Prem P. Sharma ◽  
Yeeun Jeon ◽  
Dukjoon Kim
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Arylene Ether ◽  
Ft Ir ◽  
The Cross ◽  
Stable Anion ◽  
Trimethyl Amine ◽  
A Minor ◽  
Exchange Membrane

Alkaline stable anion exchange membranes based on the cross-linked poly(arylene ether sulfone) grafted with dual quaternary piperidine (XPAES-DP) units were synthesized. The chemical structure of the synthesized PAES-DP was validated using 1H-NMR and FT-IR spectroscopy. The physicochemical, thermal, and mechanical properties of XPAES-DP membranes were compared with those of two linear PAES based membranes grafted with single piperidine (PAES-P) unit and conventional trimethyl amine (PAES-TM). XPAES-DP membrane showed the ionic conductivity of 0.021 S cm−1 at 40 °C which was much higher than that of PAES-P and PAES-TM because of the possession of more quaternary ammonium groups in the cross-linked structure. This cross-linked structure of the XPAES-DP membrane resulted in a higher tensile strength of 18.11 MPa than that of PAES-P, 17.09 MPa. In addition, as the XPAES-DP membrane shows consistency in the ionic conductivity even after 96 h in 3 M KOH solution with a minor change, its chemical stability was assured for the application of anion exchange membrane fuel cell. The single-cell assembled with XPAES-DP membrane displayed a power density of 109 mWcm−2 at 80 °C under 100% relative humidity.

Caustic stable anion-exchange membranes for EDR applications in municipal and industrial wastewater recovery: piloting and field investigations

2013 ◽  
Vol 8 (1) ◽  
pp. 27-32 ◽  
Author(s):  
Harikrishnan Ramanan ◽  
Purnima Praturi ◽  
Neil Moe ◽  
Russell MacDonald ◽  
Li May Goh ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Industrial Wastewater ◽  
High Performance ◽  
Anion Exchange Membrane ◽  
Anion Exchange Membranes ◽  
Water Recovery ◽  
Research Activity ◽  
Field Investigations ◽  
Stable Anion ◽  
Exchange Membrane

GE membrane based Electrodialysis Reversal (EDR) systems offer attractive characteristics such as higher water recovery, increased resistance to scaling and fouling, and membrane stability in oxidative environments. Research activity at GE Water & Process Technologies, have extended these capabilities to include high pH environments, through the development of a new high performance anion exchange membrane that tolerates aggressive caustic cleaning conditions. This will enable the expanded application of EDR systems in markets that are limited by the currently practiced cleaning-in-place procedures.

Synthesis and characterization of novel 4-phenyl-pyridine unit based alkaline anion exchange membranes

RSC Advances ◽  
2016 ◽  
Vol 6 (75) ◽  
pp. 71431-71440 ◽  
Author(s):  
Di Lu ◽  
Lele Wen ◽  
Lixin Xue
Keyword(s):  
Ionic Conductivity ◽  
Anion Exchange ◽  
Main Chain ◽  
High Ionic Conductivity ◽  
Synthesis And Characterization ◽  
Anion Exchange Membranes ◽  
Arylene Ether

A series of 1,2-dimethylimidazolium functionalized poly(arylene ether sulfone)s containing 4-phenyl-pyridine units in the main chain (DIm-PPYPAES) with high ionic conductivity were firstly synthesized as anion exchange membranes (AEMs) in this work.

Alkyl bisimidazolium-mediated crosslinked comb-shaped polymers as highly conductive and stable anion exchange membranes

RSC Advances ◽  
2016 ◽  
Vol 6 (20) ◽  
pp. 16168-16176 ◽  
Author(s):  
Anil H. N. Rao ◽  
SangYong Nam ◽  
Tae-Hyun Kim
Keyword(s):  
Anion Exchange ◽  
Anion Exchange Membranes ◽  
Arylene Ether ◽  
Stable Anion

Crosslinked poly(arylene ether sulfone)s (PES) with pendant alkyl bisimidazolium units, which act as both crosslinkage sites and hydroxide conductors, were developed as anion exchange membranes (AEMs).

Alkaline stable anion exchange membranes based on poly(phenylene-co-arylene ether ketone) backbones

2016 ◽  
Vol 7 (38) ◽  
pp. 5988-5995 ◽  
Author(s):  
Xiang Qiu ◽  
Mitsuru Ueda ◽  
Yi Fang ◽  
Shouwen Chen ◽  
Zhaoxia Hu ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Quaternary Ammonium ◽  
Anion Exchange Membranes ◽  
Alkaline Stability ◽  
Arylene Ether ◽  
Ether Ketone ◽  
Stable Anion

To improve the alkaline stability of anion exchange membranes (AEMs) based on conventional poly(ether ketone/sulfone) backbones, two novel poly(phenylene-co-arylene ether ketone) (PPAEK) ionomers with a quaternary ammonium (QA-) or imidazolium (IM-) group were prepared.

scholarly journals Improved Physicochemical Stability and High Ion Transportation of Poly(Arylene Ether Sulfone) Blocks Containing a Fluorinated Hydrophobic Part for Anion Exchange Membrane Applications

Polymers ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1400 ◽  
Author(s):  
Ji Chu ◽  
Kyu Lee ◽  
Ae Kim ◽  
Dong Yoo
Keyword(s):  
Phase Separation ◽  
Anion Exchange ◽  
Physical Stability ◽  
Exchange Capacity ◽  
Open Circuit ◽  
Anion Exchange Membranes ◽  
Arylene Ether ◽  
Atomic Force ◽  
Physicochemical Stability ◽  
Exchange Membrane

A series of anion exchange membranes composed of partially fluorinated poly(arylene ether sulfone)s (PAESs) multiblock copolymers bearing quaternary ammonium groups were synthesized with controlled lengths of the hydrophilic precursor and hydrophobic oligomer via direct polycondensation. The chloromethylation and quaternization proceeded well by optimizing the reaction conditions to improve hydroxide conductivity and physical stability, and the fabricated membranes were very flexible and transparent. Atomic force microscope images of quaternized PAES (QN-PAES) membranes showed excellent hydrophilic/hydrophobic phase separation and distinct ion transition channels. An extended architecture of phase separation was observed by increasing the hydrophilic oligomer length, which resulted in significant improvements in the water uptake, ion exchange capacity, and hydroxide conductivity. Furthermore, the open circuit voltage (OCV) of QN-PAES X10Y23 and X10Y13 was found to be above 0.9 V, and the maximum power density of QN-PAES X10Y13 was 131.7 mW cm−2 at 60 °C under 100% RH.

scholarly journals Highly Conductive and Water-Swelling Resistant Anion Exchange Membrane for Alkaline Fuel Cells

2019 ◽  
Vol 20 (14) ◽  
pp. 3470 ◽  
Author(s):  
Qianqian Ge ◽  
Xiang Zhu ◽  
Zhengjin Yang
Keyword(s):  
Fuel Cells ◽  
Ionic Conductivity ◽  
Anion Exchange ◽  
Microphase Separation ◽  
Anion Exchange Membranes ◽  
Alkaline Fuel Cells ◽  
Transmission Electron ◽  
Hyperbranched Poly ◽  
Water Swelling ◽  
Exchange Membrane

To ameliorate the trade-off effect between ionic conductivity and water swelling of anion exchange membranes (AEMs), a crosslinked, hyperbranched membrane (C-HBM) combining the advantages of densely functionalization architecture and crosslinking structure was fabricated by the quaternization of the hyperbranched poly(4-vinylbenzyl chloride) (HB-PVBC) with a multiamine oligomer poly(N,N-Dimethylbenzylamine). The membrane displayed well-developed microphase separation morphology, as confirmed by small angle X-ray scattering (SAXS) and transmission electron microscopy (TEM). Moreover, the corresponding high ionic conductivity, strongly depressed water swelling, high thermal stability, and acceptable alkaline stability were achieved. Of special note is the much higher ratio of hydroxide conductivity to water swelling (33.0) than that of most published side-chain type, block, and densely functionalized AEMs, implying its higher potential for application in fuel cells.

scholarly journals Phenolphthalein Anilide Based Poly(Ether Sulfone) Block Copolymers Containing Quaternary Ammonium and Imidazolium Cations: Anion Exchange Membrane Materials for Microbial Fuel Cell

Membranes ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 454
Author(s):  
Aruna Kumar Mohanty ◽  
Young-eun Song ◽  
Jung-rae Kim ◽  
Nowon Kim ◽  
Hyun-jong Paik
Keyword(s):  
Fuel Cell ◽  
Microbial Fuel Cell ◽  
Anion Exchange ◽  
Quaternary Ammonium ◽  
Anion Exchange Membrane ◽  
Anion Exchange Membranes ◽  
Good Thermal Stability ◽  
Imidazolium Cations ◽  
Membrane Morphology ◽  
Exchange Membrane

A class of phenolphthalein anilide (PA)-based poly(ether sulfone) multiblock copolymers containing pendant quaternary ammonium (QA) and imidazolium (IM) groups were synthesized and evaluated as anion exchange membrane (AEM) materials. The AEMs were flexible and mechanically strong with good thermal stability. The ionomeric multiblock copolymer AEMs exhibited well-defined hydrophobic/hydrophilic phase-separated morphology in small-angle X-ray scattering and atomic force microscopy. The distinct nanophase separated membrane morphology in the AEMs resulted in higher conductivity (IECw = 1.3–1.5 mequiv./g, σ(OH−) = 30–38 mS/cm at 20 °C), lower water uptake and swelling. Finally, the membranes were compared in terms of microbial fuel cell performances with the commercial cation and anion exchange membranes. The membranes showed a maximum power density of ~310 mW/m2 (at 0.82 A/m2); 1.7 and 2.8 times higher than the Nafion 117 and FAB-PK-130 membranes, respectively. These results demonstrated that the synthesized AEMs were superior to Nafion 117 and FAB-PK-130 membranes.

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