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.
All Science Journal Classification (ASJC) codes
- Polymers and Plastics
- Materials Chemistry