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Block copolymers have attracted much interest from researchers by the characteristic phase separation behavior. The nanophase separated structures are basically determined by the Flory-Huggins interaction parameter χ , degree of polymerization N, and composition of components φ as discussed by Leibler. Equilibrium structures for well characterized AB diblock, BAB triblock, ABC triblock, and AB2 star-branched graft copolymers, and also recent advances in relations among more complicated morphology and molecular architecture are repeatedly summarized by Matsushita et al. Even the block copolymer chains in nanophase separated structure reach thermodynamic equilibrium, the larger scale structure is in frozen states of randomly oriented multi-grain structure containing many defects. Because of these structural characters and viscoelastic heterogeneity of component polymers, viscoelastic properties of block copolymers in the ordered states become very complicated even for the simplest ones, i.e., diblock copolymers. Note that different relaxation modes from different components are overlapped in a certain experimental window for general diblock copolymer samples. A huge number of experimental and theoretical studies have been carried out to understand the relationship among morphology, molecular characteristics, and rheological behavior of block copolymers. Major results are summarized in some review articles and those closely related to this study are briefly summarized below. Bates et al 12-14) first reported that frequency (ω) dependencies of storage modulus G'(ω ) and loss modulus G"(ω ) of lamellar forming diblock copolymers asymptote to ω 0.5 at low frequency region. Kawasaki and Onuki theoretically explained the above power law behaviors as responses from large scale motions of grains/defects. Theoretical studies for rheological behaviors of block copolymers are developed to include other morphologies and chain relaxations such as chain retraction mode for entangled systems. This mode can also explain the power law behaviors. A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-b-2-vinylpyridine)s in the Ordered State

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A Separation Method of Responses from Large Scale Motions and Chain Relaxations for Viscoelastic Properties of Symmetric Poly(styrene-&lt;i&gt;b&lt;/i&gt;-2-vinylpyridine)s in the Ordered State