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Mixed micelles based on cationic and anionic amphiphilic diblock copolymers containing identical hydrophobic blocks

Abstract

Through the use of the methods of turbidimetry, UV spectrophotometry, fluorescence spectroscopy, dynamic light scattering, and ultracentrifugation, micelle formation is studied for cationic (polysty-rene-poly-N-ethyl-4-vinylpyridium bromide) and anionic (polystyrene-sodium polyacrylate) diblock copolymers containing identical polystyrene blocks in dilute aqueous saline solutions. Mixing of aqueous dispersions of individual micelles is accompanied by the formation of only insoluble products, which likely are intermicellar interpolyelectrolyte complexes. At the same time, mixing of diblock copolymers in a nonselective solvent and its subsequent gradient replacement with water during suppressed interpolyelectrolyte interactions yields mixed diblock copolymer micelles, which are found to be dispersionally stable in an excess of charged units of any polymer component. The micelles are composed of an insoluble polystyrene core and a mixed interpolyelectrolyte corona, and their hydrodynamic characteristics are controlled by the ratio of charged units in the mixed diblock copolymers. The mixed micelles are found to be able to interact with the macromolecules of a homopolyelectrolyte, sodium poly(styrene sulfonate), in aqueous solutions and form ternary complexes. In this case, depending on the composition of the mixed micelles, ternary complexes can be dispersionally stable or can aggregate and precipitate.

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Correspondence to E. A. Lysenko.

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Original Russian Text © E.A. Lysenko, A.N. Trusov, P.S. Chelushkin, T.K. Bronich, A.V. Kabanov, A.B. Zezin, 2009, published in Vysokomolekulyarnye Soedineniya, Ser. A, 2009, Vol. 51, No. 6, pp. 929–939.

This study was supported by the Russian Foundation for Basic Research, project nos. 06-03-32964 and 06-03-90153-NNF_a; the US National Science Foundation, grant DMR-0513699; and a grant for State Support of Leading Scientific Schools (NSh-168.2008.3).

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Lysenko, E.A., Trusov, A.N., Chelushkin, P.S. et al. Mixed micelles based on cationic and anionic amphiphilic diblock copolymers containing identical hydrophobic blocks. Polym. Sci. Ser. A 51, 606–615 (2009). https://doi.org/10.1134/S0965545X09060042

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Keywords

  • Block Copolymer
  • Polymer Science Series
  • Mixed Micelle
  • Diblock Copolymer
  • Hydrodynamic Characteristic