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  • Filippov, Sergey K, et al. (author)
  • Aggregation of dextran hydrophobically modified by sterically-hindered phenols in aqueous solutions : Aggregates vs. single molecules
  • 2008
  • In: European Polymer Journal. - : Elsevier BV. - 0014-3057 .- 1873-1945. ; 44:10, s. 3361-3369
  • Journal article (peer-reviewed)abstract
    • The hydrodynamic properties of dextrans hydrophobically modified by sterically-hindered phenols in aq. soln. were characterized by a combination of Cryogenic Transmission Electron Microscopy (Cryo-TEM), fluorescent spectroscopy, and Dynamic Light Scattering (DLS). All solns. investigated contained aggregates the structure, shape, and crit. aggregation concn. of which are influenced by the amt. of the inserted phenol groups in the polymer matrix. We found that increasing of temp. enhances aggregation. It was established that the crit. aggregation concn. could be well approximated by a logarithmic function of the substitution degree of the glycoside units. The results suggest that the proportion of aggregates is nevertheless negligible in comparison with the proportion of single mols.
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