Unusual Nonlinear Effects in the Rheology of Entangled Polymer Melts(Non Equilibrium Soft Matter)

概要

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We discuss the maxima in stress which were recently observed in the start up of shearing flows of entangled polymer melts with a complex branched structure. More than one maximum has been observed, and maxima can be found at extremely large values of deformation, of the order of several hundred units of shear. Furthermore, such maxima may disappear upon repeating the experiment, to come up again only after an extremely long resting time. By assuming that such high-deformation maxima are due to stretching of the internal segments of the branched structure, we develop a model able to estimate the unusual location of the maxima. The physical model underlying the calculations is also consistent with the observed effect of the resting time.
理論物理学刊行会の論文
2008-12-05