Abstract
The shear imposed oscillation technique was employed to probe the shear-induced structural changes of various model associative polymers in the shear-thinning and shear-thickening regimes. The shear-thickening behavior is related to the transformation from pre-dominantly intra-molecular to inter-molecular associations. The shear-thinning behavior under moderate shear deformation is caused by the reorganization of the transient network structure. Under high shear deformation, the shear-thinning behavior is caused solely by the shear-induced effect that increases the chain-end exit rate, which reduces the mechanical active chains and lifetime of the hydrophobe in the micellar junctions.
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