Polyelectrolyte Complex Formation with Double Hydrophilic Block Polyelectrolytes:  Effects of the Amount and Length of the Neutral Block

Zintchenko, Arkadi; Dautzenberg, H.; Tauer, Klaus; Khrenov, Viktor

doi:10.1021/la011267u

Cited by 40 publications

(57 citation statements)

References 46 publications

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“…By reaching a certain concentration of low-molecular-weight ions in complex solution, the particles start to aggregate and finally precipitate. [24,25] To prevent aggregation, various approaches were applied: the use of double hydrophilic block copolymers for complex formation [14,[26][27][28] or surface modification of complex particles with a hydrophilic reactive polymer. [29,30] The formation of hydrophilic shell around the particles sterically stabilizes them against aggregation.…”

Section: Introductionmentioning

confidence: 99%

Ternary Conjugates as a Result of Exchange Reactions Between Polyelectrolyte Complexes and Surfactants: Formation and Stability

Zintchenko

Koňák

2004

Macro Chemistry & Physics

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Summary: The exchange of sodium polymethacrylate (Na‐PMA) for anionic surfactant sodium dodecylsulfate (SDS) in a polyelectrolyte complex of Na‐PMA and poly(L‐lysine) (PLL) was studied by light scattering techniques. The exchange reaction proceeds inside the complex particles without any aggregation. It causes swelling of the particles and the formation of thick polymer shell around them. In order to prove the formation of the shell, the colloidal stability of the particles in salt solutions was studied. The addition of SDS to a complex solution dramatically increases colloid stability. The stability was found to be independent of the mixing ratio of the initial complex, depending only on the molecular weight of Na‐PMA and slowly decreasing with time. The mechanism of the exchange reaction was proposed. The addition of SDS causes fast substitution of charged units of Na‐PMA for surfactant molecules in the complex and formation of the PLL/SDS complex stabilized by hydrophobic interactions between aliphatic chains of SDS. The Na‐PMA chains cannot be released sufficiently fast from the particles due to entanglements of the chains inside the particles. They build a thick stabilizing shell around the particles and lead to their swelling. This shell protects the particles against coagulation at relatively high salt concentrations. However, such state of the particles does not correspond to thermodynamic equilibrium. Na‐PMA is very slowly released from the particles, decreasing the density of stabilizing shell and stability of the particles in salt solutions. The possible application of ternary conjugates in drug delivery is discussed.Schematic representation of changes in structure and stability of Na‐PMA/PLL complex particles upon the exchange of polyanion Na‐PMA for negatively charged surfactant SDS.magnified imageSchematic representation of changes in structure and stability of Na‐PMA/PLL complex particles upon the exchange of polyanion Na‐PMA for negatively charged surfactant SDS.

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Section: Introductionmentioning

confidence: 99%

Ternary Conjugates as a Result of Exchange Reactions Between Polyelectrolyte Complexes and Surfactants: Formation and Stability

Zintchenko

Koňák

2004

Macro Chemistry & Physics

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“…Such particles can easily be prepared by heterophase polymerization initiated by the poly(ethylene glycol)±ceric ion redox system [26]. Other examples of such dispersions are complexes between amphiphilic block copolymers with one polyelectrolyte block and either oppositely charged surfactants [21, 27±29] or other amphiphilic block copolymers with oppositely charged polyelectrolyte blocks [30].…”

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confidence: 99%

Latex Particles

Tauer¹

2003

Colloids and Colloid Assemblies

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“…Depending on the molar mixing ratio, acidity/ basicity, chain length or accessibility of the charged centre and chain flexibility of the polyelectrolytes, stoichiometric as well as non-stoichiometric PEC can be obtained (Stro¨m et al, 1985;Michaels and Miekka, 1961;Buchhammer et al, 2003;Pergushov et al, 1999;Stro¨m and Stenius, 1981;Zhang and Huang, 2000;Brand and Dautzenberg, 1997;Reihs et al, 2003;Thu¨nemann et al, 2000;Dautzenberg, 1997;Pogodina and Tsvetkov, 1997;Zintchenko et al, 2002). Chain conformation in polyectrolytes is strongly dependent on both the intensity and spatial extent of the repulsive electrostatic force between neighboring segments.…”

Section: Introductionmentioning

confidence: 99%

Formation of Soft NanoparticlesviaPolyelectrolyte Complexation: A Viscometric Study

Rondon

Argillier

Moan

et al. 2014

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Nous avons aussi mesure´la viscosite´relative des suspensions; la fraction volumique des particules a pu eˆtre estime´e en faisant l'hypothe`se que la contribution des particules et du polycation en exce`s sont inde´pendantes. Nous avons pu e´tablir l'e´volution de la stoechiome´trie des PEC et de leur fraction volumique en fonction du ratio PAH/PSS dans le me´lange initial et du pH. Nos re´sultats montrent que l'accessibilite´des charges (conformation des chaines) de´termine a`la fois la stoechiome´trie et le niveau de compaction des complexes.Abstract -Formation of Soft Nanoparticles via Polyelectrolyte Complexation: A Viscometric Study -This paper describes the formation of soft nanoparticles resulting from electrostatically driven complexation of oppositely charged polyelectrolytes. The system was composed of a strong polyanion (PolyStyrene Sulfonate, PSS) and a weak polycation (Poly(Allylamine) Hydrochloride, PAH) in large excess. Soft nanoparticles were obtained by pouring a PSS solution into a PAH one under constant stirring. The PolyElectrolyte Complexes (PEC) were characterized through a viscometric study complemented by Dynamic Light Scattering (DLS), electrophoretic mobility and suspension turbidity measurements. PEC suspensions were centrifuged and by measuring the viscosity of the supernatant, we were able to estimate the free polycation concentration and hence the percentage of complexed polycation. We also measured the relative viscosity of the suspensions; from the estimated contribution of the PEC particles and of the polycation in excess, the average particle volume fraction was estimated. From all viscometric data, we could derive the evolution of the binding stoichiometry in PEC and of the effective particle volume fraction as a function of the mixing ratio (ratio of the cationic to anionic groups) and of the pH. Our results emphasize the importance of charge accessibility in controlling both the stoichiometry and packing density of the complexes.

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Polyelectrolyte Complex Formation with Double Hydrophilic Block Polyelectrolytes: Effects of the Amount and Length of the Neutral Block

Cited by 40 publications

References 46 publications

Ternary Conjugates as a Result of Exchange Reactions Between Polyelectrolyte Complexes and Surfactants: Formation and Stability

Ternary Conjugates as a Result of Exchange Reactions Between Polyelectrolyte Complexes and Surfactants: Formation and Stability

Latex Particles

Formation of Soft NanoparticlesviaPolyelectrolyte Complexation: A Viscometric Study

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