Adamantammonium as a novel functional group for anion exchange membranes with excellent comprehensive performances

Polymer ◽  
2017 ◽  
Vol 112 ◽  
pp. 288-296 ◽  
Author(s):  
Jinlei Wang ◽  
Ying Chen ◽  
Qi Wei ◽  
Shanzhong Yang ◽  
Huagao Fang ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Functional Group ◽  
Anion Exchange Membranes

Highly alkaline stable N1-alkyl substituted 2-methylimidazolium functionalized alkaline anion exchange membranes

2015 ◽  
Vol 3 (16) ◽  
pp. 8559-8565 ◽  
Author(s):  
Congrong Yang ◽  
Suli Wang ◽  
Wenjia Ma ◽  
Luhua Jiang ◽  
Gongquan Sun
Keyword(s):  
Anion Exchange ◽  
Functional Groups ◽  
Functional Group ◽  
Anion Exchange Membranes

N1-butyl, hexyl or octyl-substituted 2-methylimidazolium functional groups are much more stable than the 1,2-dimethylimidazolium functional group.

scholarly journals Enhanced Hydroxide Conductivity and Dimensional Stability with Blended Membranes Containing Hyperbranched PAES/Linear PPO as Anion Exchange Membranes

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 3011
Author(s):  
Sang Hee Kim ◽  
Kyu Ha Lee ◽  
Ji Young Chu ◽  
Ae Rhan Kim ◽  
Dong Jin Yoo
Keyword(s):  
Anion Exchange ◽  
Functional Group ◽  
Anion Exchange Membranes ◽  
Channel Formation ◽  
Arylene Ether ◽  
Phenylene Oxide ◽  
Afm Analysis ◽  
Very High ◽  
Excessive Water ◽  
Hyperbranched Structure

A series of novel blended anion exchange membranes (AEMs) were prepared with hyperbranched brominated poly(arylene ether sulfone) (Br-HB-PAES) and linear chloromethylated poly(phenylene oxide) (CM-PPO). The as-prepared blended membranes were fabricated with different weight ratios of Br-HB-PAES to CM-PPO, and the quaternization reaction for introducing the ionic functional group was performed by triethylamine. The Q-PAES/PPO-XY (quaternized-PAES/PPO-XY) blended membranes promoted the ion channel formation as the strong hydrogen bonds interconnecting the two polymers were maintained, and showed an improved hydroxide conductivity with excellent thermal behavior. In particular, the Q-PAES/PPO-55 membrane showed a very high hydroxide ion conductivity (90.9 mS cm−1) compared to the pristine Q-HB-PAES membrane (32.8 mS cm−1), a result supported by the morphology of the membrane as determined by the AFM analysis. In addition, the rigid hyperbranched structure showed a suppressed swelling ratio of 17.9–24.9% despite an excessive water uptake of 33.2–50.3% at 90 °C, and demonstrated a remarkable alkaline stability under 2.0 M KOH conditions over 1000 h.

scholarly journals Poly(vinyl alcohol)-based Anion Exchange Membranes for Alkaline Polymer Electrolyte Fuel Cells

2021 ◽  
Vol 10 (3) ◽  
pp. 435-443
Author(s):  
Asep Muhamad Samsudin ◽  
Sigrid Wolf ◽  
Michaela Roschger ◽  
Viktor Hacker
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Water Uptake ◽  
Vinyl Alcohol ◽  
Functional Group ◽  
Exchange Capacity ◽  
Poly Vinyl Alcohol ◽  
Anion Exchange Membranes ◽  
Direct Ethanol Fuel Cells ◽  
Alkaline Polymer Electrolyte

Crosslinked anion exchange membranes (AEMs) made from poly(vinyl alcohol) (PVA) as a backbone polymer and different approaches to functional group introduction were prepared by means of solution casting with thermal and chemical crosslinking. Membrane characterization was performed by SEM, FTIR, and thermogravimetric analyses. The performance of AEMs was evaluated by water uptake, swelling degree, ion exchange capacity, OH- conductivity, and single cell tests. A combination of quaternized ammonium poly(vinyl alcohol) (QPVA) and poly(diallyldimethylammonium chloride) (PDDMAC) showed the highest conductivity, water uptake, and swelling among other functional group sources. The AEM with a combined mass ratio of QPVA and PDDMAC of 1:0.5 (QPV/PDD0.5) has the highest hydroxide conductivity of 54.46 mS cm-1. The single fuel cell tests with QPV/PDD0.5 membrane yield the maximum power density and current density of 8.6 mW cm-2 and 47.6 mA cm-2 at 57 °C. This study demonstrates that PVA-based AEMs have the potential for alkaline direct ethanol fuel cells (ADEFCs) application.

Polymeric materials as anion-exchange membranes for alkaline fuel cells

2011 ◽  
Vol 36 (11) ◽  
pp. 1521-1557 ◽  
Author(s):  
Guillaume Couture ◽  
Ali Alaaeddine ◽  
Frédéric Boschet ◽  
Bruno Ameduri
Keyword(s):  
Fuel Cells ◽  
Anion Exchange ◽  
Polymeric Materials ◽  
Anion Exchange Membranes ◽  
Alkaline Fuel Cells

High‐capacity multimodal anion‐exchange membranes for polishing of therapeutic proteins

2021 ◽  
Author(s):  
Joshua Osuofa ◽  
Daniel Henn ◽  
Jinxiang Zhou ◽  
Anna Forsyth ◽  
Scott M. Husson
Keyword(s):  
Anion Exchange ◽  
Therapeutic Proteins ◽  
High Capacity ◽  
Anion Exchange Membranes

scholarly journals Innovative BPPO Anion Exchange Membranes Formulation Using Diffusion Dialysis-Enhanced Acid Regeneration System

Membranes ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 311
Author(s):  
Muhammad Imran Khan ◽  
Majeda Khraisheh ◽  
Fares AlMomani
Keyword(s):  
Anion Exchange ◽  
Room Temperature ◽  
Feed Solution ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Regeneration System ◽  
Waste Streams ◽  
Acid Recovery ◽  
Aqueous Waste ◽  
Diffusion Dialysis

Recycling of acid from aqueous waste streams is crucial not only from the environmental point of view but also for maturing the feasible method (diffusion dialysis). Anion exchange membrane (AEM)–based diffusion dialysis process is one of the beneficial ways to recover acid from aqueous waste streams. In this article, the synthesis of a series of brominated poly (2, 6–dimethyl-1, 4–phenylene oxide) (BPPO)-based anion exchange membranes (AEMs) through quaternization with triphenylphosphine (TPP) were reported for acid recovery via diffusion dialysis process. The successful synthesis of the prepared membranes was confirmed by Fourier transform infrared (FTIR) spectroscopy. The as-synthesized anion exchange membranes represented water uptake (WR) of 44 to 66%, ion exchange capacity of (IEC) of 1.22 to 1.86 mmol/g, and linear swelling ratio (LSR) of 8 to 20%. They exhibited excellent thermal, mechanical, and acid stability. They showed homogeneous morphology. The acid recovery performance of the synthesized AEMs was investigated in a two compartment stack using simulated mixture of HCl and FeCl2 as feed solution at room temperature. For the synthesized anion exchange membranes TPP–43 to TPP–100, the diffusion dialysis coefficient of acid (UH+) was in the range of 6.7 to 26.3 (10−3 m/h) whereas separation factor (S) was in the range of 27 to 49 at 25 °C. Obtained results revealed that diffusion dialysis performance of the synthesized AEMs was higher than the commercial membrane DF–120B (UH+ = 0.004 m/h, S = 24.3) at room temperature. It showed that the prepared AEMs here could be excellent candidates for the diffusion dialysis process.

scholarly journals Transport Characteristics of CJMAED™ Homogeneous Anion Exchange Membranes in Sodium Chloride and Sodium Sulfate Solutions

2021 ◽  
Vol 22 (3) ◽  
pp. 1415
Author(s):  
Veronika Sarapulova ◽  
Natalia Pismenskaya ◽  
Valentina Titorova ◽  
Mikhail Sharafan ◽  
Yaoming Wang ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Volume Fraction ◽  
Exchange Capacity ◽  
Polymer Materials ◽  
Transport Numbers ◽  
Anion Exchange Membranes ◽  
Microheterogeneous Model ◽  
Pass Through ◽  
Pes Membrane

The interplay between the ion exchange capacity, water content and concentration dependences of conductivity, diffusion permeability, and counterion transport numbers (counterion permselectivity) of CJMA-3, CJMA-6 and CJMA-7 (Hefei Chemjoy Polymer Materials Co. Ltd., China) anion-exchange membranes (AEMs) is analyzed using the application of the microheterogeneous model to experimental data. The structure–properties relationship for these membranes is examined when they are bathed by NaCl and Na2SO4 solutions. These results are compared with the characteristics of the well-studied homogenous Neosepta AMX (ASTOM Corporation, Japan) and heterogeneous AMH-PES (Mega a.s., Czech Republic) anion-exchange membranes. It is found that the CJMA-6 membrane has the highest counterion permselectivity (chlorides, sulfates) among the CJMAED series membranes, very close to that of the AMX membrane. The CJMA-3 membrane has the transport characteristics close to the AMH-PES membrane. The CJMA-7 membrane has the lowest exchange capacity and the highest volume fraction of the intergel spaces filled with an equilibrium electroneutral solution. These properties predetermine the lowest counterion transport number in CJMA-7 among other investigated AEMs, which nevertheless does not fall below 0.87 even in 1.0 eq L−1 solutions of NaCl or Na2SO4. One of the reasons for the decrease in the permselectivity of CJMAED membranes is the extended macropores, which are localized at the ion-exchange material/reinforcing cloth boundaries. In relatively concentrated solutions, the electric current prefers to pass through these well-conductive but nonselective macropores rather than the highly selective but low-conductive elements of the gel phase. It is shown that the counterion permselectivity of the CJMA-7 membrane can be significantly improved by coating its surface with a dense homogeneous ion-exchange film.

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