Catastrophic phase inversion in region II of an ionomeric polymer-water system

Journal of Colloid and Interface Science
L K SawD V Keight

Abstract

Previous work has identified distinct regions, on a phase inversion map, for dispersions of polyurethane ionomer (PUI) and water. In this study, events that occur, before, during, and after catastrophic phase inversion (provoked by adding water to polyurethane ionomer (PUI) in the RII regions of the phase inversion map) have been studied in order to characterise the inversion mechanism. Before phase inversion, initial water addition leads to the hydration of ionic groups and eventually water drops start to form in the hydrophobic portions of the polymer matrix. At the phase inversion point, the PUI-water interface restructures and the ionomer disintegrates into a dispersion of spherical particles enclosed by a continuous aqueous phase. It is suggested that pseudo-drop structures are formed simultaneously during the production of the small polymer-in-water drops. After phase inversion, water addition dilutes the emulsion and destroys the apparent ionic-centre-rich environment surrounding any isolated ionic groups on a particle surface. The larger water-in-polymer drops are likely to have participated in the phase inversion and the smaller water drops form the primary water drops in the multiple emulsions. The resultant emulsions...Continue Reading

References

Nov 1, 2005·Journal of Colloid and Interface Science·L K SawD V Keight

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Citations

Mar 20, 2013·Physical Chemistry Chemical Physics : PCCP·Dragan NikolićAndriy Kovalenko
Aug 21, 2014·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Shan-Hui HsuJui-Che Lin

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