Abstract
The behaviour of dextran in the mixed solvent H 2O/(1–4)-dioxane has been studied by static and dynamic light scattering. Dioxane is a precipitant for dextran. Addition of dioxane to an aqueous solution of dextran induced a conformation transition of dextran from a random coil to a compact globule. Thereby, a dextran molecule first swells when the dioxane content is small and collapses when the dioxane content is large. From static light scattering the parameter of selective adsorption, λ A , the second virial coefficient, A 2, and the radius of gyration, 〈 S 2 〉 0.5 were determined. By means of dynamic light scattering the hydrodynamic radius, R H , the structural factor, ϱ, and the stiffness parameter, k f 0 were studied. The experimental results are discussed on the basis of the Flory-Huggins theory including the ternary coefficient, gt.
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