The zero-shear viscosity η0 of styrene-2-vinylpyridine diblock copolymers in semidilute solutions was measured in pyridine (a commonly good solvent), methyl ethyl ketone (MEK) (a commonly poor solvent) at 25°C, and in benzene (a selective solvent) at 11.4°C. It was found that the reduced zero-shear viscosity ηR0 (≡ηsp0/C[η]) is expressed as a universal function of C[η] in all solvents, and the dependence of ηR0 on C[η] is determined by the exponent in the relationship between the radius of gyration and molecular weight of the block component which has the larger excluded volume, regardless of the solvent.
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