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On the structure of transparent water and oil dispersions stabilized by polymeric emulsifiers

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  • Polymer Science
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Summary

An investigation has been made of transparent oil-water dispersions stabilized by amphiphilic polymeric substances. The samples are well-defined polyethylene oxide — polystyrene graft copolymers with various lengths of backbone and side chains. The domain for existence of microemulsions and the phase diagrams were determined turbidimetrically by titration with 2-propanol for water/toluene/graft copolymer systems. Results are generalized to several amphilic copolymers of different chemical structure using various polar oils. A behavior markedly different is observed depending on whether soaps or copolymers are used for these systems. In particular, polymeric microemulsions form only when there is a mutual solubility for the ternary solvent mixture. A simple model is proposed, based on particles which consist of two concentric spheres having a PS part solvated by toluene and a PEO part by water, the continuous medium being composed of the ternary solvent mixture at mutual solubility. The size of the particles was determined by light scattering spectroscopy.

Zusammenfassung

Transparente, durch amphiphile Polymere stabilisierte Öl-Wasserstreuungen wurden untersucht. Die Proben bestehen aus modellartigen Polyäthylenoxyd-Polystyrol-Pfropfcopolymeren mit verschiedenen Haupt- und Seitenkettenlängen. Wir haben den Bereich der Mikroemulsionbildung und die Phasendiagramme durch Titration der Wasser/Toluol/Pfropfcopolymeren mit 2-Propanol bestimmt. Die allgemeine Gültigkeit der Ergebnisse wurde an mehreren amphiphilen Copolymeren mit verschiedenen chemischen Zusammensetzungen und in verschiedenen Ölen probiert. Ganz verschiedenes Verhalten wurde festgestellt —je nachdem ob Seifen oder Copolymere angewendet wurden. Insbesondere bilden sich Polymermikroemulsionen nur, wenn eine gegenseitige Löslichkeit in den ternären Mischsystemen besteht. Ein einfaches Modell aus zwei konzentrischen Kugeln wird vorgeschlagen: Die eine Kugel besteht aus toluolgequollenem Polystyrol, die andere aus wassergequollenem Polyäthylenoxyd. Die kontinuierliche Phase wird dargestellt durch das ternäre Lösungsmittelsystem. Die Partikelgrößen wurden mit Lichtstreuung bestimmt.

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Boutillier, J., Candau, F. On the structure of transparent water and oil dispersions stabilized by polymeric emulsifiers. Colloid & Polymer Sci 257, 46–56 (1979). https://doi.org/10.1007/BF01539016

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  • DOI: https://doi.org/10.1007/BF01539016

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