Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

Tishchenko, Galina; Bleha, M.; Škvor, Jiřı́; Bureš, L.; Mizutani, Yukio; Ohmura, Nobuhiko

doi:10.1002/app.1995.070580816

Cited by 5 publications

(2 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Several polymers, such as fluoropolymers, − polysulfones, − and cross-linked polystyrene, − are commonly used as the polymer backbones for preparing numerous cationic exchange membranes (CEMs) and anionic exchange membranes (AEMs). They show various advantages but also some shortfalls.…”

Section: Introductionmentioning

confidence: 99%

New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity

et al. 2011

View full text Add to dashboard Cite

This paper discusses a new class of high performance polyethylene-based anion exchange membranes (PE–AEMs) that contain a wide concentration range of pendant (flexible) ammonium chloride (NR3 +Cl–) groups and with or without a cross-linked PE matrix structure. The chemistry involves a metallocene-mediated polymerization of ethylene, silane-protected α,ω-amino-olefin [C x N(SiMe3)2], with or without styrenic diene (cross-linker), to form ethylene/C x N(SiMe3)2 copolymers and ethylene/C x N(SiMe3)2/diene terpolymers, respectively. The resulting co- and ter-polymers were completely soluble in common organic solvents and were solution-casted into uniform films (thickness, 50–70 μm; without backing material) and then thermal cross-linked in ethylene/C x N(SiMe3)2/diene case, further interconverting the silane-protected amino groups into the desired −NR3 +Cl– groups (R: H, CH3, and C3H7) under solid state conditions. The resulting PE–NR3 +Cl– and cross-linked x-PE–N(CH3)3 +Cl– membranes were systematically studied to understand how the PE structure (−NR3 +Cl– concentration, R group, cross-linking density, etc.) affects ionic conductivity, water uptake, film stability, and ion selectivity. For comparison, several commercially available AEMs were also examined. Evidently, an x-PE–N(CH3)3 +Cl– membrane, with 28.1 mol % −N(CH3)3 +Cl– groups and 0.2 mol % cross-linkers, shows moderate water swelling and outperforms all commercial membranes with exceptionally high ionic conductivities of 119.6 mS/cm in 2 N HCl solution and 78.8 mS/cm in 2 N HCl–0.2N CuCl solution at room temperature.

show abstract

Section: Introductionmentioning

confidence: 99%

New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity

et al. 2011

View full text Add to dashboard Cite

show abstract

“…However, it is very rare to see polyolefin-based ion conductors used as a solid polymer electrolyte (SPE) , or ion exchange membrane (IEM) − that can perform both separator and ion conductor functions. Several polymers, such as poly(ethylene oxide), − fluoropolymers, − polysulfones, − and cross-linked polystyrene, − are commonly used as the polymer backbones for preparing numerous SPE and IEMs. They show various advantages, however also some shortfalls.…”

Section: Energy Applicationsmentioning

confidence: 99%

Functional Polyolefins for Energy Applications

2013

View full text Add to dashboard Cite

Polyolefins, including polyethylene (PE) and polypropylene (PP), represent more than half of commercial polymers produced in the world. They are known to be costeffective and good performing materials used in a broad range of commodity applications that influence our everyday lives. On the other hand, less attention has been paid to their specialty applications, commonly requiring the material to have multiple performance functions. The limitations and shortcomings of polyolefins have stemmed from lack of functionality and structure diversity, which are compounded with the long-standing challenges in the chemical modification (functionalization) of polyolefins. In the past two decades, in conjunction with advances in metallocene catalysis, a new method based on the "reactive" polyolefin approach has emerged, which affords a new class of functional polyolefins with high molecular weight and well-controlled molecular structures that have functional groups located at chain ends, side chains, and block/graft segments. In addition to forming distinctive multiple phase morphology with shape hydrophobic−hydrophilic microphase separation and surface properties, some functional polyolefins with flexible polar (or ionic) groups offer excellent mobility for polarization, ion conductivity, etc. They present potentials for polyolefins in high-value, specialty applications. In this paper, I will cover three energy-related areas, including polymer film capacitors for electric energy storage, ion exchange membranes for hydrogen energy, and oil superabsorbent polymers for oil spill recovery, to discuss the effects of new polyolefin structures on their performances and the future perspectives. The objective is to provide examples that reveal underlying benefits of this new class of high-performance, cost-effective functional polyolefin materials and hopefully inspire more researchers to explore their applications.

show abstract

Purification of polymer nanoparticles by diafiltration with polysulfone/hydrophilic polymer blend membranes

Tishchenko

2001

Separation and Purification Technology

View full text Add to dashboard Cite

Morphology of microporous neosepta ion‐exchange membranes and its effect on separation of biological mixtures

Cited by 5 publications

References 7 publications

New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity

New Polyethylene Based Anion Exchange Membranes (PE–AEMs) with High Ionic Conductivity

Functional Polyolefins for Energy Applications

Purification of polymer nanoparticles by diafiltration with polysulfone/hydrophilic polymer blend membranes

Contact Info

Product

Resources

About