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Solubilities of ionic surfactants in aqueous polymer solutions

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Summary

Solubility of ionic surfactants in water have been found to increase with added amount of nonionic hydrophilic polymers when both are capable of forming watersoluble complexes. Experiments were carried out with sodium hexadecyl sulfate (SHS) and hexadecyl amine hydrochloride (HAC) below theKrafft points of the respective surfactants. The solubility increment of the surfactants brought about by the polymers depends upon the kind of polymers, their molecular weight, concentration and temperature. The results have been interpreted on the basis of the amount of surfactants bound to the polymers and by the properties of the polymer-surfactant complexes formed. It is noteworthy that the anionic surfactant (SHS) can be bound to polymers much more extensively than the cationic surfactant (HAC).

Zusammenfassung

Die Löslichkeit von ionischen Benetzern in Wasser wächst mit dem zugefügten Betrag an nicht-ionischen hydrophilen Polymeren, wenn beide zusammen wasserlösliche Komplexe büden können. Versuche wurden mit Natrium-hexadecyl-sulfat (SHS) und Hexadecylamin-hydrochlorid (HAC) ausgeführt, und zwar unter denKrafft-Punkten der bezüglichen Benetzer. Das Löslichkeitsinkrement der Benetzer, gegeben durch die Polymeren, hängt von der Art des Polymeren, dessen Molekulargewicht, Konzentration und Temperatur ab. Die Ergebnisse werden interpretiert auf der Grundlage des Betrages an Benetzer, der an das Polymere gebunden ist, und durch die Eigenschaften des Komplexes Polymer/Benetzer. Es ist bemerkenswert, daß der anionische Benetzer (SHS) viel stärker an das Polymere gebunden werden kann als der kationische Benetzer (HAC).

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Saito, S. Solubilities of ionic surfactants in aqueous polymer solutions. Kolloid-Z.u.Z.Polymere 215, 16–21 (1967). https://doi.org/10.1007/BF01500474

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