The Electrochemical Properties of Polysulfone Ion-Exchange Membranes

Ersöz, Mustafa

doi:10.1006/jcis.2001.7832

Cited by 9 publications

(3 citation statements)

References 42 publications

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“…Membrane potential is defined as the electrical potential difference arising through a membrane that separates two solutions of the same electrolyte at the same temperature and hydrostatic pressure but different concentrations. This technique has been applied to a variety of membrane systems, including ion-exchange membranes – and porous membranes such as microfiltration, , ultrafiltration, – and nanofiltration – membranes.…”

Section: Introductionmentioning

confidence: 99%

Influence of Steric, Electric, and Dielectric Effects on Membrane Potential

2008

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The membrane potential arising through nanofiltration membranes separating two aqueous solutions of the same electrolyte at identical hydrostatic pressures but different concentrations is investigated within the scope of the steric, electric, and dielectric exclusion model. The influence of the ion size and the so-called dielectric exclusion on the membrane potential arising through both neutral and electrically charged membranes is investigated. Dielectric phenomena have no influence on the membrane potential through neutral membranes, unlike ion size effects which increase the membrane potential value. For charged membranes, both steric and dielectric effects increase the membrane potential at a given concentration but the diffusion potential (that is the high-concentration limit of the membrane potential) is affected only by steric effects. It is therefore proposed that membrane potential measurements carried out at high salt concentrations could be used to determine the mean pore size of nanofiltration membranes. In practical cases, the membrane volume charge density and the dielectric constant inside pores depend on the physicochemical properties of both the membrane and the surrounding solutions (pH, concentration, and chemical nature of ions). It is shown that the Donnan and dielectric exclusions affect the membrane potential of charged membranes similarly; namely, a higher salt concentration is needed to screen the membrane fixed charge. The membrane volume charge density and the pore dielectric constant cannot then be determined unambiguously by means of membrane potential experiments, and additional independent measurements are in need. It is suggested to carry out rejection rate measurements (together with membrane potential measurements).

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Section: Introductionmentioning

confidence: 99%

Influence of Steric, Electric, and Dielectric Effects on Membrane Potential

2008

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“…8,9 The available substrate materials for preparing ion-exchange membranes are poly(ether ether ketone), poly(phosphazene), polystyrene, polyimide, poly(ether sulfone) (PES), polysulfone and so on. [10][11][12][13][14][15][16] It is generally agreed that cation exchange membranes should have high chemical and mechanical stability with favorable electrochemical properties. Among these materials, polystyrene (PS) is frequently used polymer due to its good chemical stability and excellent characteristics for functionalization.…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of a cation exchange membrane using a styrene-hydroxyethyl acrylate-lauryl methacrylate terpolymer

2010

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A novel cation exchange membrane based on a styrene-hydroxyethyl acrylate-lauryl methacrylate terpolymer (St-HEA-LMA) was prepared. Sulfonic groups were introduced to the membrane structure with sulfuric acid as the sulfonating agent and silver sulfate as the initiator. Sulfonated St-HEA-LMA terpolymer membranes were characterized by Fourier-transform infrared (FTIR) spectroscopy and atomic force microscopy (AFM), as well as by determining the degree of sulfonation (DS), ion-exchange capacity (IEC), swelling ratio and electrical resistance of the membranes. The presence of sulfonic groups in the sulfonated St-HEA-LMA terpolymer was confirmed by FTIR, and the resulting membrane exhibited an ion-exchange capacity of 2.13 meq/g and an electrical resistance of 1.17 Ω·cm 2 . The swelling ratio of the prepared membranes increased with increasing degree of sulfonation, and the tensile strength decreased with increasing degree of sulfonation at a reaction temperature of 30 o C. The phase images obtained by AFM clearly showed an increase in roughness with increasing DS. Considering the mechanical properties, the sulfonated St-HEA-LMA terpolymer obtained at a sulfonation reaction temperature of 20 o C was suitable for ion-exchange membrane applications.

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“…To obtain the desired properties of ion‐exchange membranes, many preparation methods have been practiced. Currently, the most widely used materials for the preparation of high‐performance proton ion‐exchange membranes are PEEK, polystyrene (PS), polyimide, PES, polysulfone, and so on 8–14. It is generally agreed that cation‐exchange membranes should have high chemical and mechanical stability with favorable electrochemical properties.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of cation‐exchange membrane based on sulfonated sty/HEA/LMA terpolymer

Shin

Choi

Hwang

2010

J of Applied Polymer Sci

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A cation-exchange membrane based on a styrene/hydroxyethyl acrylate/lauryl methacrylate (Sty/ HEA/LMA) terpolymer was prepared via a postsulfonation reaction for various sulfonation times. Sulfonic groups were introduced into the membrane structure with sulfuric acid as the sulfonating agent and silver sulfate as an initiator in a nitrogen atmosphere. Sulfonated Sty/HEA/LMA terpolymer membranes were characterized by Fourier transform infrared (FTIR) spectrometry and nuclear magnetic resonance as well as by determining the degree of sulfonation (DS), ion-exchange capacity (IEC), water uptake (WU), and electrical property of the membranes.The presence of sulfonic groups in the sulfonated Sty/ HEA/LMA terpolymer was confirmed by FTIR, and the resulting membrane showed an IEC of 1.29 meq/g and an electrical resistance of 0.1 X cm 2 . The WU of the prepared membranes increased with the DS at the reaction time. The surface morphology obtained by atomic force microscopy clearly showed an increase of roughness with reaction time.

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The Electrochemical Properties of Polysulfone Ion-Exchange Membranes

Cited by 9 publications

References 42 publications

Influence of Steric, Electric, and Dielectric Effects on Membrane Potential

Influence of Steric, Electric, and Dielectric Effects on Membrane Potential

Preparation and characterization of a cation exchange membrane using a styrene-hydroxyethyl acrylate-lauryl methacrylate terpolymer

Synthesis and characterization of cation‐exchange membrane based on sulfonated sty/HEA/LMA terpolymer

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