Structure and dynamics of dextran in binary mixtures of a good and a bad solvent

Eleftheria Antoniou, Efrosyni Themistou, Biswajit Sarkar, Marina Tsianou, Paschalis Alexandridis

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44 Citations (Scopus)


The structure and dynamics of the common polysaccharide dextran have been investigated in mixed solvents at two different temperatures using small-angle X-ray scattering (SAXS) and viscosity measurements. More specifically, binary mixtures of a good solvent (water, formamide, dimethylsulfoxide, ethanolamine) and the bad solvent ethanol as the minority component have been considered. The experimentally observed effects on the polymer conformation (intrinsic viscosity, coil radius, and radius of gyration) of the bad solvent addition are discussed in terms of hydrogen bonding density and are correlated with the Hansen solubility parameters and the surface tension of the solvent mixtures. Hydrogen bonding appears to be an important contributor to the solubility of dextran but is not sufficient to capture the dextran coil contraction in the mixtures of good+bad solvents.
Original languageEnglish
Pages (from-to) 1301-1312
JournalColloid and Polymer Science
Issue number12-13
Early online date17 Jul 2010
Publication statusPublished - Aug 2010

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