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- W2005229258 endingPage "422" @default.
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- W2005229258 abstract "When aqueous solutions of polycations and polyanions are mixed, polyelectrolyte complexes form. These are usually insoluble in water, so that they separate out as a new concentrated polymer phase, called a complex coacervate. The behavior of these complexes is reviewed, with emphasis on new measurements that shed light on their structural and mechanical properties, such as cohesive energy, interfacial tension, and viscoelasticity. It turns out that stoichiometric complexes can be considered in many respects as pseudo-neutral, weakly hydrophobic polymers, which are insoluble in water, but become progressively more soluble as salt is added. In fact, the solubility-enhancing effect of salt is quite analogous to that of temperature for polymers in apolar solvents. Since two-phase systems can be prepared in colloidal form, we also discuss several kinds of colloids or ‘microphases’ that can arise due to polyelectrolyte complexation, such as thin films, ‘zipper’ brushes, micelles, and micellar networks. A characteristic feature of these charge-driven two-phase systems is that two polymeric ingredients are needed, but that some deviation from strict stoichiometry is tolerated. This turns out to nicely explain how and when the layer-by-layer method works, how a ‘leverage rule’ applies to the density of the ‘zipper brush’, and why soluble complexes or micelles appear in a certain window of composition. As variations on the theme, we discuss micelles with metal ions in the core, due to incorporation of supramolecular coordination polyelectrolytes, and micellar networks, which form a new kind of physical gels with unusual properties." @default.
- W2005229258 created "2016-06-24" @default.
- W2005229258 creator A5022792563 @default.
- W2005229258 creator A5074132674 @default.
- W2005229258 creator A5076719382 @default.
- W2005229258 creator A5091764794 @default.
- W2005229258 date "2011-09-01" @default.
- W2005229258 modified "2023-10-10" @default.
- W2005229258 title "Polyelectrolyte complexes: Bulk phases and colloidal systems" @default.
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