Abstract
AbstractViscosities of dilute and concentrated solutions of a styrene‐butadiene‐styrene triblock copolymer in solvents of different thermodynamic quality and at different temperatures were studied. In 1,4‐dioxane (theta solvent for butadiene blocks) the viscosity derived polymer‐polymer interaction parameter has been found to be much smaller than in decalin (theta solvent for styrene blocks) or in tetralin (good solvent for both blocks). The dynamic viscosity and the enthalpy of activation of viscous flow, ΔH, increase much faster for 1,4‐dioxane solutions with increasing concentration than those for decalin or tetralin. The different properties of solutions in different solvents are discussed in terms of the physical structure of the systems.
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