Abstract
The molecular motion of polymers in concentrated solutions is studied on the basis of recent measurements of relaxation stresses in the nonlinear region of viscoelasticity. The double-step deformation with varying time interval is proved to be specifically effective for studying not only a slow mode of the motion known as the reptation, but also a faster mode often referred to as the wriggling motion. It is found that in the former mode, the entanglement points behave as slip-links as assumed in the Doi–Edwards theory, while in the latter mode, they turn to be non-slip-links, as assumed in the recent Doi theory. The transfer of monomers across the entanglement points is practically inhibited at least in the early stage of the wriggling motion. The concept of non-slippery entanglements corresponds to the independent alignment approximation (IAA) of Doi and Edwards, which leads to the rheological constitutive model of Bernstein, Kearsley, and Zapas (BKZ model).
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Kurata, M. Molecular Motion of Polymers in Concentrated Solutions. Polym J 17, 217–224 (1985). https://doi.org/10.1295/polymj.17.217
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DOI: https://doi.org/10.1295/polymj.17.217