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Authors
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Kiriy, A. ; Yu, J. ; Stamm, M.
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Title
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Interpolyelectrolyte Complexes: A Single-Molecule Insight
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Date
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16.03.2006
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Number
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13969
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Abstract
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Polyelectrolyte (PE) complexes (PECs) between long polycation poly(methacryloyloxyethyl dimethylbenzylammonium chloride) and short polyanion polystyrene sulfonic acid adsorbed onto mica were studied by atomic forcemicroscopy. If one component is taken in excess, then a rapid coupling of the oppositely charged polyions first leadsto the formation of nonequilibrium structures when collapsed PEC particles coexist with unreacted PEs molecules.The equilibrium PEC particles possess micelle-like core<I>-</I>shell morphology if the short polyion is taken in excess.When long PE is given in excess, equilibrium PECs are stabilized by wrapping the long polyion around hydrophobicsegments of the PEC. We propose that transformations of initially formed nonequilibrium aggregates proceed throughslow reactions (addition or/and substitution) of primary complexes with unreacted PEs chains, which finally leadsto equilibrium PECs with optimized morphology. As expected, the mixing of oppositely charged PEs in a near-stoichiometric ratio leads to highly aggregated water-insoluble PECs.
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Publisher
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Langmuir
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Wikidata
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Citation
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Langmuir 22 (2006) 1800-1803
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DOI
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https://doi.org/10.1021/la051908b
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Tags
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flexible polyelectrolyte molecules chloride-acrylamide copolymers poly-electrolyte complexes atomic-force microscope cooperative interactions unlike macromolecules sodium poly(styrenesulfonate) gold particles gene-delivery polycation
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