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Constitutive equation and damping function for entangled polymers
Osaki, Kunihiro The Korean Society of Rheology 1999 Korea-Australia rheology journal Vol.11 No.4
The tube model theory of entangled polymer presumes that the polymer chain holds its equilibrium contour length under certain conditions of flow; at times longer than a certain characteristic time, ${\tau}_k$, in the stress relaxation process following any flow history; in steady flow of rates smaller than ${{\tau}_k}^{-1}$; etc. Rheological phenomena associated with this presumption are discussed.