Synthesis and Properties of Self-Crosslinking Anion Exchange Membranes Based on Quaternary Poly(arylene Ether Sulfone)s

2012 ◽  
Vol 608-609 ◽  
pp. 857-860
Author(s):  
Shi Chao Fang ◽  
Hongliang Zhang ◽  
Feilong Wang ◽  
Hui Ping Bi ◽  
Zhao Xia Hu ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Hydrolytic Stability ◽  
Dimensional Change ◽  
Exchange Capacity ◽  
Ion Conductivity ◽  
The Self ◽  
Anion Exchange Membranes ◽  
Condensation Polymerization ◽  
Ion Exchange Capacity ◽  
Arylene Ether

A series of anion exchange membranes based on poly(arylene ether sulfone)s (PAES) have been prepared through condensation polymerization, chloromethylation and quaternization. The membrane using N, N, N’,N’-tetramethylhexyldiamine both as the quaternization and crosslinking reagent had self-crosslinking structure, and their properties have been compared with those using trimethylamie as the quaternization reagent, including ion exchange capacity, solubility, water uptake, dimensional change, hydrolytic stability and ion conductivity. The self-crosslinking membranes showed improvement in durability towards common organic solvents, dimensional stability and ion conductivity.

scholarly journals Preparation of Two-Layer Anion-Exchange Poly(ethersulfone) Based Membrane: Effect of Surface Modification

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
Lucie Zarybnicka ◽  
Eliska Stranska ◽  
Jana Machotova ◽  
Gabriela Lencova
Keyword(s):  
Surface Layer ◽  
Surface Modification ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Exchange Capacity ◽  
Sem Analysis ◽  
Electrochemical Characteristics ◽  
Anion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Effect Of Surface

The present work deals with the surface modification of a commercial microfiltration poly(ethersulfone) membrane by graft polymerization technique. Poly(styrene-co-divinylbenzene-co-4-vinylbenzylchloride) surface layer was covalently attached onto the poly(ethersulfone) support layer to improve the membrane electrochemical properties. Followed by amination, a two-layer anion-exchange membrane was prepared. The effect of surface layer treatment using the extraction in various solvents on membrane morphological and electrochemical characteristics was studied. The membranes were tested from the point of view of water content, ion-exchange capacity, specific resistance, permselectivity, FT-IR spectroscopy, and SEM analysis. It was found that the two-layer anion-exchange membranes after the extraction using tetrahydrofuran or toluene exhibited smooth and porous surface layer, which resulted in improved ion-exchange capacity, electrical resistance, and permselectivity of the membranes.

scholarly journals A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36374-36385
Author(s):  
Chao Wang ◽  
Nengxiu Pan ◽  
Yuliang Jiang ◽  
Junbin Liao ◽  
Arcadio Sotto ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Dimensional Stability ◽  
Synthesis Method ◽  
Exchange Capacity ◽  
Alkali Resistance ◽  
Anion Exchange Membranes ◽  
Facile Synthesis ◽  
Ion Exchange Capacity ◽  
Alkali Stability

Novel anion exchange membranes with enhanced ion exchange capacity, dimensional stability and alkali stability were prepared by a facile synthesis method.

Cation and Anion Exchange Membranes Prepared by Radiation-Induced Graft Polymerization for Application in Electrodialysis

2014 ◽  
Vol 881-883 ◽  
pp. 1157-1160 ◽  
Author(s):  
Jin Hua Chen ◽  
Asano Masaharu ◽  
Yasunari Maekawa
Keyword(s):  
Aqueous Solution ◽  
Anion Exchange ◽  
Graft Polymerization ◽  
Exchange Capacity ◽  
Anion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Electrodialysis Cell ◽  
Radiation Induced ◽  
Poly Ethylene ◽  
Percent Removal

Cation and anion exchange membranes were prepared by radiation-induced graft polymerization of ethyl styrenesulfonate and chloromethyl styrene, respectively, onto poly (ethylene-alt-tetrafluoroethylene) (ETFE) films, followed by hydrolysis in the former case and quaternization in the latter case. The degree of grafting as well as the ion exchange capacity (IEC) and the conductivity of the prepared membranes were investigated. Furthermore, the cation and anion exchange membranes were tested in an electrodialysis cell using CsNO3 aqueous solution in the dilute compartment. It was found that the high-IEC membranes enhanced the electrodialysis speed, while the low-IEC membranes showed the high percent removal.

scholarly journals Synthesis of Porous BPPO-Based Anion Exchange Membranes for Acid Recovery Via Diffusion Dialysis

Membranes ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 95
Author(s):  
Muhammad Imran Khan ◽  
Abdallah Shanableh ◽  
Majeda Khraisheh ◽  
Fares AlMomani
Keyword(s):  
Contact Angle ◽  
Anion Exchange ◽  
Exchange Capacity ◽  
Porous Membranes ◽  
Anion Exchange Membranes ◽  
Water Contact ◽  
Ion Exchange Capacity ◽  
Acid Recovery ◽  
Diffusion Dialysis ◽  
Group Concentration

Diffusion dialysis (DD) is an anion exchange membrane-based functional separation process used for acid recovery. TMA (trimethylamine) and BPPO (brominated poly (2,6-dimethyl-1,4-phenylene oxide) were utilized in this manuscript to formulate AEMs (anion exchange membranes) for DD (diffusion dialysis) using the phase-inversion technique. FTIR (Fourier transfer infrared) analysis, proton NMR spectroscopy, morphology, IEC (ion exchange capacity), LER (linear expansion ratio), CR (fixed group concentration), WR (water uptake/adsorption), water contact angle, chemical, and thermal stability, were all used to evaluate the prepared membranes. The effect of TMA content within the membrane matrix on acid recovery was also briefly discussed. It was reported that porous AEMs have a WR of 149.6% to 233.8%, IEC (ion exchange capacity) of 0.71 to 1.43 mmol/g, CR (fixed group concentration) that ranged from 0.0046 mol/L to 0.0056 mol/L, LER of 3.88% to 9.23%, and a water contact angle of 33.10° to 78.58°. The UH (acid dialysis coefficients) for designed porous membranes were found to be 0.0043 to 0.012 m/h, with separation factors (S) ranging from 13.14 to 32.87 at the temperature of 25 °C. These observations are comparable to those found in the DF-120B commercial membrane with UH of 0.004 m/h and S of 24.3 m/h at the same temperature (25 °C). This porous membranes proposed in this paper are excellent choices for acid recovery through the diffusion dialysis process.

Preparation and Properties of Poly (phthalazinone Ether Ketone) Based Anion Exchange Membranes for Vanadium Redox Flow Battery

2013 ◽  
Vol 773 ◽  
pp. 171-174
Author(s):  
Shou Hai Zhang ◽  
Ben Gui Zhang ◽  
Xi Gao Jian
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Exchange Capacity ◽  
Vanadium Redox Flow Battery ◽  
Anion Exchange Membranes ◽  
Redox Flow Battery ◽  
Flow Battery ◽  
Ion Exchange Capacity ◽  
Ether Ketone ◽  
Vanadium Redox

Poly (phthalazinone ether ketone) anion exchange membranes with pyridinium groups (PyPPEK) for vanadium redox flow battery were prepared from chloromethylated poly (phthalazinone ether ketone) and pyridine. The chemical structure of PyPPEK was characterized by using FT-IR spectrum. Compared with quaternary ammonium group containing poly (phthalazinone ether ketone), PyPPEK membrane showed low ion exchange capacity, low swelling ratio and comparable tensile strength. Columbic efficiencies of VRB with anion exchange membranes were higher than that of VRB with Nafion117 membrane. When the ion exchange capacity of PyPPEK membrane was 1.40 mmol·g-1, energy efficiency of VRB with the membrane was higher than that of VRB with Nafion117 membrane at charge-discharge current densities ranging from 20 mA·cm-2 to 50 mA·cm-2.

scholarly journals Systematic Characterization of Degraded Anion Exchange Membranes Retrieved from Vanadium Redox Flow Battery Field Tests

Membranes ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 469
Author(s):  
Elke Herrmann ◽  
Nico Dingenouts ◽  
Christina Roth ◽  
Frieder Scheiba ◽  
Helmut Ehrenberg
Keyword(s):  
Ion Exchange ◽  
Anion Exchange ◽  
Field Tests ◽  
Exchange Capacity ◽  
Vanadium Redox Flow Battery ◽  
Ex Situ ◽  
Anion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Swelling Power

Commercially available anion exchange membranes were retrieved from VRFB field tests and their degradation due to the various operation conditions is analyzed by in-situ and ex-situ measurements. Ion exchange capacity, permeability and swelling power are used as direct criteria for irreversible changes. Small-angle X-ray scattering (SAXS) and Differential scanning calorimetry (DSC) analyses are used as fingerprint methods and provide information about the morphology and change of the structural properties. A decrease in crystallinity can be detected due to membrane degradation, and, in addition, an indication of reduced polymer chain length is found. While the proton diffusion either increase or decline significantly, the ion exchange capacity and swelling power both are reduced. The observed extent of changes was in good agreement with in-situ measurements in a test cell, where the coulombic and voltage efficiencies are reduced compared to a pristine reference material due to the degradation process.

scholarly journals Fast Bulky Anion Conduction Enabled by Free Shuttling Phosphonium Cations

Research ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Xiaolin Ge ◽  
Yubin He ◽  
Kaiyu Zhang ◽  
Xian Liang ◽  
Chengpeng Wei ◽  
...  
Keyword(s):  
Anion Exchange ◽  
Exchange Capacity ◽  
Dynamics Simulation ◽  
Energy Storage And Conversion ◽  
Anion Exchange Membranes ◽  
Temperature Dependent ◽  
Ion Exchange Capacity ◽  
New Applications ◽  
Conversion Technologies ◽  
Anion Conduction

Highly conductive anion-exchange membranes (AEMs) are desirable for applications in various energy storage and conversion technologies. However, conventional AEMs with bulky HCO3- or Br- as counterion generally exhibit low conductivity because the covalent bonding restrains the tethered cationic group’s mobility and rotation. Here, we report an alternative polyrotaxane AEM with nontethered and free-shuttling phosphonium cation. As proved by temperature-dependent NMR, solid-state NMR, and molecular dynamics simulation, the phosphonium cation possesses a thermally trigged shuttling behavior, broader extension range, and greater mobility, thus accelerating the diffusion conduction of bulky anions. Owing to this striking feature, high HCO3- conductivity of 105 mS cm-1 at 90°C was obtained at a relatively lower ion-exchange capacity of 1.17 mmol g-1. This study provides a new concept for developing highly conductive anion-exchange membranes and will catalyze the exploration of new applications for polyrotaxanes in ion conduction processes.

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