Preparation of Highly Stable Ion Exchange Membranes by Radiation-Induced Graft Copolymerization of Styrene and Bis(vinyl phenyl)ethane Into Crosslinked Polytetrafluoroethylene Films

2006 ◽  
Vol 4 (1) ◽  
pp. 56-64 ◽  
Author(s):  
Tetsuya Yamaki ◽  
Junichi Tsukada ◽  
Masaharu Asano ◽  
Ryoichi Katakai ◽  
Masaru Yoshida
Keyword(s):  
Ion Exchange ◽  
Proton Conductivity ◽  
Water Uptake ◽  
Graft Copolymerization ◽  
Exchange Capacity ◽  
Polymer Electrolyte Fuel Cells ◽  
Ion Exchange Membranes ◽  
Aromatic Rings ◽  
Ion Exchange Capacity ◽  
Radiation Induced

We prepared novel ion exchange membranes for possible use in polymer electrolyte fuel cells (PEFCs) by the radiation-induced graft copolymerization of styrene and new crosslinker bis(vinyl phenyl)ethane (BVPE) into crosslinked polytetrafluoroethylene (cPTFE) films and subsequent sulfonation and then investigated their water uptake, proton conductivity, and stability in an oxidizing environment. In contrast to the conventional crosslinker, divinylbenzene (DVB), the degree of grafting of styrene∕BVPE increased in spite of high crosslinker concentrations in the reacting solution (up to 70mol%). Quantitative sulfonation of the aromatic rings in the crosslinked graft chains resulted in the preparation of membranes with a high ion exchange capacity that reached 2.9meq∕g. The bulk properties of the membranes were found to exceed those of Nafion membranes except for chemical stability. The emphasis was on the fact that the BVPE-crosslinked membranes exhibited the higher stability in the H2O2 solution at 60°C compared to the noncrosslinked and DVB-crosslinked ones, as well as decreased water uptake and reasonable proton conductivity. These results are rationalized by considering the reactivity between styrene and the crosslinker, which is an important factor determining the distribution of the crosslinks in the graft component. In the case of BVPE, the crosslinks at a high density were homogeneously incorporated even into the interior of the membrane because of its compatibility with styrene while the far too reactive DVB led to a crosslink formation only near the surface. The combination of both the cPTFE main chain and BVPE-based grafts, i.e., a perfect “double” crosslinking structure, is likely to effectively improve the membrane performances for PEFC applications.

Synthesis and Characterization of Sulfonated Polybenzimidazole (SPBI) Copolymer for Polymer Exchange Membrane Fuel Cell

2013 ◽  
Vol 860-863 ◽  
pp. 803-806 ◽  
Author(s):  
Loh Kee Shyuan ◽  
Eng Lee Tan ◽  
Wan Ramli Wan Daud ◽  
Abu Bakar Mohamad
Keyword(s):  
Fuel Cell ◽  
Ion Exchange ◽  
Proton Conductivity ◽  
Water Uptake ◽  
Uptake Rate ◽  
Exchange Capacity ◽  
Ion Exchange Capacity ◽  
Phase Inversion Technique ◽  
Sulfonated Polybenzimidazole ◽  
Exchange Membrane

A diverse sulfonated polybenzimidazole copolymer (SPBI) as proton exchange membrane was synthesiszed via one-step high temperature polymerization method with 3,3-diaminobenzidine (DABD), 5-sulfoisophthalic acid (SIPA), 4,4-sulfonyldibenzoic acid (SDBA) and biphenyl-4,4-dicarboxylic acid (BDCA). The SPBI membrane was prepared through a direct hot-casting and in situ phase inversion technique. Characterization tests were carried out on the membranes including surface morphology, distribution of elements on the membrane, determination of functional groups, thermal stability, ion exchange capacity, water uptake rate and proton conductivity. The as-synthesized SPBI membrane displayed a smooth surface via scanning electron microscopy (SEM) analysis which is thermally stable up to 443 °C. The SPBI membrane showed higher water uptake rate (WUR) and proton conductivity though it had lower ion exchange capacity (IEC) value compared to recast Nafion membrane. The proton conductivity of the SPBI membrane with IEC of 0.60 mmol/g was 4.50 × 10-2 S/cm at 90 °C. This study shows that the SPBI membrane has great potential in polymer exchange membrane fuel cell (PEMFC) applications.

Equilibrium Sorptions in Heterogeneous Ion Exchange Membranes

1992 ◽  
Vol 57 (9) ◽  
pp. 1905-1914
Author(s):  
Miroslav Bleha ◽  
Věra Šumberová
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Total Content ◽  
Distribution Coefficients ◽  
Exchange Capacity ◽  
Ion Exchange Membranes ◽  
Ion Exchange Capacity ◽  
Equilibrium Sorption ◽  
Inhomogeneity Factor

The equilibrium sorption of uni-univalent electrolytes (NaCl, KCl) in heterogeneous cation exchange membranes with various contents of the ion exchange component and in ion exchange membranes Ralex was investigated. Using experimental data which express the concentration dependence of equilibrium sorption, validity of the Donnan relation for the systems under investigation was tested and values of the Glueckauf inhomogeneity factor for Ralex membranes were determined. Determination of the equilibrium sorption allows the effect of the total content of internal water and of the ion-exchange capacity on the distribution coefficients of the electrolyte to be determined.

Using Ion Exchange Capacity to Control Water Uptake in Electrodes of Low-Temperature Anion Exchange Membrane Electrolyzers

2020 ◽  
Vol MA2020-02 (38) ◽  
pp. 2442-2442
Author(s):  
Garrett Huang ◽  
Mrinmay Mandal ◽  
Alexandra Dobbs ◽  
Katelyn Groenhout ◽  
Paul A Kohl
Keyword(s):  
Low Temperature ◽  
Ion Exchange ◽  
Anion Exchange ◽  
Water Uptake ◽  
Exchange Capacity ◽  
Anion Exchange Membrane ◽  
Ion Exchange Capacity ◽  
Exchange Membrane ◽  
Control Water

Synthesis and physiochemical performances of PVC-sodium polyacrylate and PVC-sodium polyacrylate-graphite composite polymer membrane

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Abdul Hamid ◽  
Muhammad Khan ◽  
Fakhar Hussain ◽  
Amir Zada ◽  
Tiehu Li ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Water Uptake ◽  
Composite Membranes ◽  
Type A ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Polymeric Membranes ◽  
Sodium Polyacrylate ◽  
Ion Exchange Capacity ◽  
Graphite Composite

Abstract Three types (type-A, B, and C) of composite polymeric membranes (CPMs) based on poly vinyl chloride (PVC) and different fillers (sodium polyacrylate and sodium polyacrylate-graphite) soaked in water and 0.5 N HCl were prepared using solvent casting method. Different physicochemical parameters such as microscopic surface study, water uptake, perpendicular swelling, density, porosity (ε), ion exchange capacity, and conductivity of the as the prepared CPMs were evaluated. Interestingly, type-A CPM cast with filler-A has greater values of the above parameters except density and ionic conductivity than those of type-B and C CPMs. The water uptake of type-A, B and C composite membranes was respectively in the range of 220.42–534.70, 59.64–41.65, and 15.94–2.62%. Ion exchange capacity of type-A, B and C CPMs was in the range of 3.669 × 107–2.156 × 107, 5.948 × 107–1.258 × 107, and 1.454 × 107–1.201 × 107 m.eq.g−1 respectively while the conductivity order was type-A < B < C. These types of CPMs may be helpful in many applications including proton exchange membranes, fuel cell like devices, as sensors for different metals, gas purification, water treatment, and battery separators.

scholarly journals CHARACTERIZATION OF SULFONATED POLYSULFONE/BENTONITE HYBRID MEMBRANES

2014 ◽  
Vol 13 (1) ◽  
pp. 7
Author(s):  
Bambang Piluharto ◽  
Imam Syafi’i ◽  
R. Indahsari ◽  
Tanti Haryati
Keyword(s):  
Ion Exchange ◽  
Water Uptake ◽  
Mechanical Stability ◽  
Group Analysis ◽  
Exchange Capacity ◽  
Polysulfone Membrane ◽  
Ion Exchange Capacity ◽  
Fuel Cell Application ◽  
Sulfonated Polysulfone ◽  
Functional Group Analysis

Sulfonated polysulfone membrane is one of the alternative membranes as replacing Nafion membrane for the fuel cell application. This membrane was prepared by introducing sulfonic group in the polysulfone structure backbone, so that provides the ionic membrane. However, more ionic groups in the SPSF membrane lead to loss mechanical stability. This study aims to prepare the hybrid membrane from SPSF and bentonite. In here, various of bentonite concentrations were used as variable to study water uptake and ion-exchange capacity properties. As the results, increasing bentonite concentrations lead to increase water uptake and ion-exchange capacity. By the functional group analysis, proved that adding bentonite in SPSF did not change structure of SPSF, means that interaction between SPSF and bentonite were physical interactions.

Preparation of Cation Exchanger Using Electrospun Polystyrene Nanofiber

2006 ◽  
Vol 10 (2) ◽  
pp. 196-200 ◽  
Author(s):  
Hyung-Hwan An ◽  
◽  
Changyun Shin ◽  
Keyword(s):  
Ion Exchange ◽  
Glass Fiber ◽  
Water Uptake ◽  
Cation Exchanger ◽  
Fiber Surface ◽  
High Water ◽  
Exchange Capacity ◽  
Experimental Results ◽  
Ion Exchanger ◽  
Ion Exchange Capacity

We studied a new ion exchanger for high ion exchange capacity (IEC) and rapid ion exchange. Polystyrene nanofiber ion exchangers (PSNIEs) were prepared by electrospinning from solutions of dissolved polystyrene followed by sulfonation. Coating and sulfonation were used to modify the glass fiber surface with polystyrene to produce cation exchanger fiber (CEF). We present new experimental results on the performance of PSNIE and CEF related to parameters of IEC, water uptake, and surface morpoholgy. IEC and water uptake of PSNIE depend on sulfonation time. IEC reached 3.74 mmol/g at relatively high water uptake of 0.6 to 0.77g H2O/g-dry-PNIE. IEC and water uptake of CEF reached 3.61mmol/g-CEF and 0.25g H2O/g-dry-CEF.

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