Dynamic Tube Dilation in Branched Polymers(Non Equilibrium Soft Matter)

概要

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In the tube model for entangled polymer chains, the topological constraint for a given probe chain imposed by surrounding matrix chains is represented as a tube confining the probe. Most of current tube models further assume that the relaxed portions of the probe and matrix chains are equivalent to a simple solvent and thus the tube dilates as the relaxation proceeds with time. For polymers of various architectures, this molecular picture of full dynamic tube dilation (full-DTD) can describe the linear viscoelastic relaxation modulus considerably well. However, recent experiments for polymers having so-called type-A dipoles indicate that the full-DTD picture cannot consistently describe the viscoelastic and dielectric relaxation processes of star-branched and multi-branched polymers because of inconsistent coarse-graining of length and time scales incorporated in this picture. This article presents a brief review of these experimental results and explains the molecular picture of partial-DTD in which the length and time scales are consistently coarse-grained on the basis of the constraint release (CR) mechanism.
理論物理学刊行会の論文
2008-12-05