Molecular Study of Associating Polymer Rheology

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Rheology of associating polymer systems was theoretically studied. (1) The influence of low-molecular-weight surfactants : It was shown that the peak height appeared in the zero-shear viscosity and the relaxation time strongly depends on the synergism in the mixed micelle formation. (2) Effect of the number of associative groups per chain : It was shown that if the average number of associative groups per chain in bound state is large, viscoelastic relaxation behavior is well described in terms of the Rouse model. (3) Effect of the junction structure : Due to the cooperativity effect of the association/dissociation processes, the longest relaxation regime was shown to deviate from the Maxwell behavior depending on the length of the junction zone.