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Dielectric and Viscoelastic Study of Entanglement Dynamics: A Review of Recent Findings
Author(s) -
Watanabe Hiroshi,
Matsumiya Yumi,
Inoue Tadashi
Publication year - 2005
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200551005
Subject(s) - viscoelasticity , quantum entanglement , dielectric , relaxation (psychology) , materials science , chain (unit) , statistical physics , chemical physics , thermodynamics , physics , quantum mechanics , quantum , psychology , social psychology , optoelectronics
Abstract This article gives a review of the results of recent dielectric and viscoelastic studies for entangled binary blends of linear cis ‐polyisoprenes to explain the current understanding of the equilibrium entanglement dynamics on the basis of the molecular picture of dynamic tube dilation (DTD). Comparison of dielectric and viscoelastic properties reveals that the full‐DTD picture regarding the relaxed portions of the chains as a solvent fails for the high molecular weight component chain in the blends at intermediate times. This failure is related to insufficient constraint release (CR) equilibration of the entanglement segments of this chain. A partial‐DTD picture properly considering this CR equilibration successfully describes the linear relaxation behavior of the blends. The dielectric and viscoelastic properties of PI under fast flow, being affected by the flow‐activated CR/DTD mechanism, are also presented in order to demonstrate the usefulness of the comparison of these properties in both equilibrium and non‐equilibrium states.