Abstract
Relations between viscosity and the rate of shear and elastic modulus G′ and between the dynamic viscosity ν′ and frequency have been investigated for solutions of diblock copolymers of styrene and butadiene in decalin and tetralin at 25° in the concentration interval from 0·05 to 50 g/dl. The observed effects of pseudoplasticity and anomalous frequency dependences of G′ are explained from the standpoint of formation of a macronetwork consisting of segregated domains of PS, the latter network being unstable with respect to the action of the velocity gradient field. In tetralin (a “good” solvent for both copolymer blocks) the effect is associated with thermodynamic incompatibility of the blocks. In decalin (φ-solvent for PS) at room temperature the effect is intensified on account of selective action of the solvent.
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