Abstract
In current tube models for entangled polymer chains, the tube representing the topological constraint is considered to move with time. This tube motion results in constraint release (CR) as well as dynamic tube dilation (DTD), the latter occurring as a result of CR-equilibration of the chain. For the DTD process of type-A star chains, a particular relationship between the normalized dielectric and viscoelastic relaxation functions, Φ(t) and μ(t), can be derived under an assumption that a fluctuation amplitude of the star-branching point (BP) is smaller than the diameter of the dilated tube. This DTD relationship, μ(t) ≅ [Φ(t)]2, does not hold for the terminal relaxation of the stars (Watanabe et al. J. Polym. Sci. B Polym. Phys. 2000, 38, 1024). This result, suggesting failure of the DTD molecular picture, might have been also attributed to breakdown of the assumption utilized in the above derivation. Under this background, this study examined dielectric and viscoelastic properties for a series of type-A ...
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