Abstract
Linear viscoelastic behavior was investigated for concentrated solutions of a styrene—butadiene block copolymer, that is, a 4-armed star-branched polybutadiene structure with a polystyrene block on each chain end. The effect of varying solvent, concentration c, and temperature T was investigated by applying the method of reduced variables to the shear stresses at the start and on cessation of steady shear flow. When the solvent had a strong solvent power for both the polystyrene and the polybutadiene, the viscoelastic behavior was only slightly different from that in homopolymer solutions. In the case of the 1-chlorohexadecane solvent, the solubility of polystyrene varied much in the temperature range of measurement. In this case, the method of reduced variables with respect to t–c and t–T was not applicable, the viscosity η0 varied to a very large extent with c and T, and the ratio τ10/η0 increased with increasing c, where τ10 is the maximum relaxation time. The result was tentatively interpreted in terms of a molecular aggregate consisting of a few molecules connected to each other through the hard domains of the polystyrene block solution.
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Osaki, K., Kim, BS. & Kurata, M. Rheology of Copolymer Solutions. III. The Linear Viscoelasticity of SBS Block Copolymer Solutions. Polym J 10, 353–363 (1978). https://doi.org/10.1295/polymj.10.353
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DOI: https://doi.org/10.1295/polymj.10.353