Summary
Solubilization of water in nonaqueous solutions of polymeric surfactants (polystyrene-polyethyleneoxide graft copolymers) has been investigated. The effect of temperature on the formation of single-phase systems reveals the existence of an optimum solubilization temperature which depends on the hydrophilic character of the surfactant. Addition of an alcohol causes an increase in the solubilizing power of the amphiphilic copolymer. Dialysis experiments show that the one-phase homogeneous systems consists of reverse micelles with water solubilized in the interior of aggregates. The type of dispersions obtained in the diphasic region of the phase diagram is studied by N.m.r. experiments. From the results, it appears that the general features of these high molecular weight systems resemble that of classical microemulsions prepared with small nonionic detergents.
Zusammenfassung
Wir untersuchten die Löslichkeit von Wasser in nichtwäßrigen Lösungen von Polymertensiden (Polystyrol-Polyäthylenoxid Pfropfcopolymere). Der Temperatureffekt auf die Bildung von Monophasensystemen ergibt eine optimale Solubilisierungstemperatur, die vom hydrophilen Charakter der Tenside abhängig ist. Fügt man einen Alkohol hinzu, so steigt die Solubilisierungskraft des amphiphilen Copolymerisates. Dialysierungsexperimente zeigen, daß die homogenen Monophasensysteme aus inversen Mizellen bestehen, die Wasser in der Mitte der Aggregate gelöst haben. Solche Dispersionstypen bestehen in der Zweiphasengegend des Phasendiagramms und wurden durch N.m.r.-Experimente bestätigt. Wir zeigten, daß das Verhalten dieser hochmolekularen Systeme gleich denen von klassischen Mikroemulsionen aus kleinen nicht-ionischen Tensiden ist.
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Ballet, F., Debeauvais, F. & Candau, F. The effect of temperature and alcohol on the solubilization of water in nonaoueous solutions of polymeric emulsifiers. Colloid & Polymer Sci 258, 1253–1262 (1980). https://doi.org/10.1007/BF01668772
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DOI: https://doi.org/10.1007/BF01668772