The complex modulus is phenomenologically calculated with the relaxation spectrum containing both the wedge region and the box region, in order to consider the concentration dependence and molecular weight dependence of the viscoelastic behavior of moderately concentrated solutions of chain polymers. The width of the box region is estimated using Hayashi's theory for a weakly coupled rubberlike network structure. The result is in good agreement with some experimental data without change in the wedge region, that is, without the assumption of a change in the hydrodynamic interaction between segments which is required in the analysis based on Tschoegl's theory.
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Yamamoto et al. (1967) studied this question.
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