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It is well known that block copolymers possess orderdisorder transition (ODT) at a certain condition determined by Flory-Huggins interaction parameter χ , degree of polymerization N, and composition φ , which can be basically explained by Leibler’s theory. Composition dependence of equilibrium nanophase-separated structures for well characterized AB, BAB and ABC block copolymers and also for AB2 star-branched copolymers are summarized by Matsushita. In the so-called weak segregation regime near the ODT, thermal fluctuations of composition existing in a length scale of the copolymer chain and the viscoelastic heterogeneity of components influence phase behavior and viscoelastic properties of block copolymers. In the strong segregation regime, nanophase separated structure of block copolymers reaches equilibrium states in chain length scale. In the larger scale, however, the structure is randomly oriented multigrain structure which is dependent on thermal and flow history. These structural characters and the viscoelastic heterogeneity of components are the reasons for very complicated rheological properties of block copolymers. Relationships between structures and viscoelastic properties of block copolymers are also summarized in some review articles. A brief summary of results related with this paper is as following. The most well studied relationships between structure and rheology of block copolymers are those for lamellar forming diblocks. In the quiescent disordered states, it was reported that the fluctuation effects are more pronounced on the viscoelastic properties than those on scattering data. Both Viscoelastic Properties of Low Molecular Weight Symmetric Poly(styrene-b-2-vinylpyridine)s in the Ordered and Disordered States under Steady Shear Flow

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Viscoelastic Properties of Low Molecular Weight Symmetric Poly(styrene-&lt;i&gt;b&lt;/i&gt;-2-vinylpyridine)s in the Ordered and Disordered States under Steady Shear Flow