Polymer-surfactant Interactions |
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Authors: | Capalbi A La Mesa C |
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Institution: | (1) Dipartimento di Chimica, Universitŕ di Roma ‘La Sapienza’, P. le A. Moro 5, 00185 Roma, Italy |
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Abstract: | Aqueous solutions containing poly(vinyl-pyrrolidone) and sodium caprylate, or poly(vinyl-pyrrolidone) and tetraethylammonium
perfluorooctanesulfonate,respectively, have been investigated by volumetric, ionic conductivity and surface tension methods.
The presence of an interaction region has been determined from conductivity and surface tension. The width of such a region
depends on the amount of polymer in the mixture,temperature, surfactant content and added electrolyte (NaCl). The observed
behaviour was explained in terms of the combined effects played by the alkyl-chain hydophobicity, polar head group(s) and
counter-ions.
An approximate solution to a mass action model for the binding of surfactants onto polymers has been introduced. It allows
determining the width of the interaction region as a function of polymer mass percent in the mixture.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | conductivity interactions phase diagrams polymers surface tension surfactants |
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