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• W2016307640 abstract "Polyelectrolyte complex formation of a strong polyanion, potassium poly(vinyl alcohol) sulfate (KPVS), with positively charged nanogels was studied at 25 °C in aqueous solutions with different KCl concentrations (Cs) as a function of the polyion−nanogel mixing ratio based on moles of anions versus cations. Used as the gel sample was a polyampholytic nanogel consisting of lightly cross-linked terpolymer chains of N-isopropylacrylamide, acrylic acid, and 1-vinylimidazole; thus, the complexation was performed at pH 3 at which the imidazole groups are fully protonated to generate positive charges. Turbidimetric titration was employed to vary the mixing ratio. Also employed for studies of the resulting complexes at different stages of the titration were dynamic light scattering (DLS) and static light scattering (SLS) techniques. It was found from the titration as well as DLS and SLS that there is a critical mixing ratio (cmr) at which both the size and molar mass of the complexed gel particles abruptly increase. The value of the cmr at Cs = 0 or 0.01 M (mol/L) was observed at ∼1:1 mixing ratio of anions versus cations but at lower mixing ratios than the 1:1 ratio under conditions of Cs = 0.05 and 0.1 M. At the mixing ratios less than the cmr, the molar mass of the complex agrees with that of one gel particle with the calculated amount of the bound KPVS ions, indicating the formation of an “intraparticle” KPVS−nanogel complex, by the aggregation of which an “interparticle” complex is formed at the cmr. During the process of the intraparticle complex formation, both the hydrodynamic radius by DLS and the radius gyration by SLS decreased with increasing mixing ratio, demonstrating the gel collapse due to the complexation. At Cs = 0 or 0.01 M and under conditions where the amount of KPVS bindings was less than half of the nanogel cations, however, the decrease of the hydrodynamic radius was very small, while the radius gyration fell monotonically. These results were discussed in connection with a collapse of dangling chains attached to the nanogel surface by the binding of KPVS." @default.
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• W2016307640 date "2005-04-21" @default.
• W2016307640 modified "2023-10-17" @default.
• W2016307640 title "Formation of Intra- and Interparticle Polyelectrolyte Complexes between Cationic Nanogel and Strong Polyanion" @default.
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• W2016307640 doi "https://doi.org/10.1021/la047071m" @default.
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