Non-laminated ion-exchange membranes

Křivčík, Jan; Nugent, David; Weinertová, Kristýna; Stránská, Eliška

doi:10.5004/dwt.2017.20592

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…This leads to an increase of free volume and, consequently, worse mechanical properties. This phenomenon influences also membrane electrochemical properties like the resistance and the permselectivity (Křivčík et al , 2017). Electrochemical resistance strongly depends on ion mobility through the membrane.…”

Section: Resultsmentioning

confidence: 99%

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Impact of reinforcing fabric thread count on cation exchange membrane properties

Stránská

Nugent

Křivčík

et al. 2018

IJCST

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Purpose The purpose of this paper is to examine the impact of thread count in polyester reinforcing fabric on heterogeneous cation exchange membrane mechanical properties and electrochemical performance. Design/methodology/approach Seven polyester fabrics differing in thread count were used for membrane manufacture and mechanical properties such as ultimate force or ultimate strain of all fabrics and membranes were determined. Electrochemical and physical properties of produced membranes were evaluated as well. Findings It was found that with increasing weft density ultimate force became greater in the case of fabric and membrane as well. The impact of weft density on ultimate strain was not confirmed but changes in swelling ability mainly in width direction were observed. The assumption of worse electrochemical properties of membranes reinforced by fabric with lower open area was also validated and these membranes exhibited higher areal resistance. Originality/value Gained information is a useful tool in design process of new ion exchange membrane types with improved mechanical and swelling properties.

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Section: Resultsmentioning

confidence: 99%

“…Electrochemical resistance strongly depends on ion mobility through the membrane. The higher the swelling changes and the higher the concentration of functional groups, the higher the ion mobility (Křivčík et al , 2017). In Table IV, there are presented physical and electrochemical properties of prepared cation exchange membranes.…”

Section: Resultsmentioning

confidence: 99%

Impact of reinforcing fabric thread count on cation exchange membrane properties

Stránská

Nugent

Křivčík

et al. 2018

IJCST

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“…More pores lead to increase the free volume in IEMs and decrease the mechanical properties. This behaviour influences all IEM properties like the resistance and the permselectivity [38]. Electrochemical resistance of IEMs strongly depends on ion mobility through the IEM.…”

Section: Resultsmentioning

confidence: 99%

“…Electrochemical resistance of IEMs strongly depends on ion mobility through the IEM. The higher the swelling changes and the higher the concentration of functional groups, the higher the ion mobility [38].…”

Section: Resultsmentioning

confidence: 99%

Reinforcing fabrics as the mechanical support of ion exchange membranes

Stránská

Nugent

2017

Journal of Industrial Textiles

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Mechanical, physical and electrochemical characteristics are one of the important properties of ion exchange membranes. These parameters are required for a next operation and for an application in an electrodialysis (as tightness of a stack, energy consumption, capacity of electrodialysis). The goal of this article is comparison of the influence of the different reinforcing fabric on the properties of ion exchange membranes. Six types of ion exchange membranes with the nonwoven fabric, the monofilament knit, the multifilament knit, the monofilament woven fabric, the multifilament woven fabric, and for comparison non-reinforcing ion exchange membranes were chosen. The most important properties of a fabric in this application are thickness, free area related to the warp and the weft, mechanical strength, the material (shrinkage), type of fabric (plain or twill weave, a knit, monofilament, multifilament) and of course price. Electrochemical, physical and mechanical properties of ion exchange membranes were studied. Non-reinforcing ion exchange membranes have lower mechanical strength, but the best elongation. These ion exchange membranes report big relative dimension changes after swelling in demineralized water and the lowest value of the areal resistance. The most appropriate ion exchange membrane is with woven fabric from monofilaments after comparison with other ion exchange membranes in terms of the quality of the lamination and other electrochemical, physical and mechanical parameters.

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