Some Effects of Reducing the Charge Density on the Transport Properties of Sulfonated Poly(ether ether sulfone)/Poly(ether sulfone) Membranes

Autor:	Kimberly A. Weldon, J. C. Robin Turner, Patrick Meares
Rok vydání:	1995
Předmět:	chemistry.chemical_classification General Chemical Engineering Inorganic chemistry Charge density Ether General Chemistry Sulfonic acid Industrial and Manufacturing Engineering Ion Sulfone chemistry.chemical_compound Membrane chemistry Polymer chemistry Copolymer Ion transporter
Zdroj:	Industrial & Engineering Chemistry Research. 34:2817-2820
ISSN:	1520-5045 0888-5885
DOI:	10.1021/ie00047a034
Popis:	Sulfonated poly(ether ether sulfone)/poly(ether sulfone) copolymer membranes can be made with a range of densities of sulfonic acid cation exchange groups. Measurements of membrane potentials enable the transport number of cations (in our case sodium ions) in the membranes to be obtained. The conductances of these membranes have also been measured. It is clear that the nature of the transport behavior changes as the cation density decreases. For the most dilute membrane the transport number seems not to obey Donnan theory. The conductance of that membrane is about five orders of magnitude less than the most concentrated membrane whose charge density is less than four times as great.
Databáze:	OpenAIRE
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