Binding of electrolytes to poly(ethylene oxide) in methanol
Author
dc.contributor.author
Quina, Frank
Author
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Sepúlveda, Luis
Author
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Sartori, Rebeca
Author
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Abuin, Elsa B.
Author
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Pino, Carmen G.
Author
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Lissi Gervaso, Eduardo A.
Admission date
dc.date.accessioned
2019-01-29T12:39:37Z
Available date
dc.date.available
2019-01-29T12:39:37Z
Publication date
dc.date.issued
1986
Cita de ítem
dc.identifier.citation
Macromolecules 1986, 19, 990-994
Identifier
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15205835
Identifier
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00249297
Identifier
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10.1021/ma00158a010
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/159600
Abstract
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The binding of potassium and sodium salts (thiocyanate and iodide as anions) to polyethylene
oxide) in methanol solutions has been studied. The study was performed by the use of fluorescence techniques
and ultrafiltration experiments coupled with conductivity measurements. The results obtained conform to
an adsorption model of fixed adsorption sites where the cations are the primary species adsorbed, thus creating
a charged polymer able to concentrate the anions in the surroundings of the coil. For a given cation, the local
concentration of the anions depends on the ionic strength of the media in a manner not accounted for byconsidering only electrostatic interaction, thus indicating that specific interactions such as ion-pair formation
(or other factors such as differences in the activity coefficients of the counterions) must be considered in the
adsorption process. The ultrafiltraton experiments are compatible with a simple model of “bound” and “free”
counterions by showing that at least some of the anions are able to move freely in the solution, but the
experiments also indicate that specific interactions of the counterions with the charged polymer are operative.