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The effect of temperature on the adsorption of a nonionic surfactant on a PMMA latex
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
YKI – Ytkemiska institutet.
1993 (English)In: Journal of Colloid and Interface Science, ISSN 0021-9797, E-ISSN 1095-7103, Vol. 155, 70-78 p.Article in journal (Refereed)
Abstract [en]

Adsorption isotherms of a nonionic surfactant, viz. a nonylphenol-polyethylene oxide with 20 ethylene oxide units in the chain, NP-EO20, on poly(methyl methacrylate), PMMA, latex have been determined at 10, 25, 40, 60 and 80°C. At all temperatures the isotherms are of high affinity type, i.e. strong adsorption at low solution concentration reaching a limiting value at higher concentration. The adsorption is strongly temperature dependent and increasing with the temperature. Thermo--dynamic analysis reveals that the only factor significantly affecting the temperature dependence of the adsorption of nonionic surfactants of NP-EOn type is the polyethylene oxide - water interaction. Adsorption measurements can therefore be used as a sensitive probe for this interaction. Two explanations are given for the temperature dependence of the polyethylene oxide - water interaction. The first is that the temperature dependence of this interaction is dominated by the water structuring, normally occuring around hydrophobic molecules. The increase in adsorption with temperature is a result of the decreasing water structuring. The second explanation is that the polymer has a higher probability of occupying less favorable conformations as the temperature is increased, thus rendering the polymer less soluble in the water phase, which in turn increases the adsorption.

Place, publisher, year, edition, pages
1993. Vol. 155, 70-78 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-26770OAI: oai:DiVA.org:ri-26770DiVA: diva2:1053773
Note
A734Available from: 2016-12-08 Created: 2016-12-08Bibliographically approved

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