Abstract
Theoretical arguments and experimental data that can be considered a justification for a new behavioristic model of viscoelastic polymer melts and concentrated solutions in the domain of high rates (stresses) have been collected and discussed. This domain corresponds to the rubbery-like state of the matter. Two basic conditions are met: (i) rubbery (reversible) deformations are dominant over irreversible deformations to such an extent that the flow (dissipative losses) can be completely neglected and the medium can be treated as elastic; (ii) the material structure becomes strongly heterogeneous and consists in local bundles of entanglements connected by intermediary chains. As a consequence, this structure can be considered a discrete system analogous to highly concentrated suspensions of soft (deformable) particles. These basic assumptions were used to construct a new nonlinear model describing the mechanical behavior of entangled polymer melts and concentrated solutions (A. V. Semakov and V. G. Kulichikhin, Polym. Sci., Ser. A. 51, 1313–1328 (2009)). This model correctly predicts the chaos-to-order transition and self-organization at high deformation rates.
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Original Russian Text © A.Ya. Malkin, A.V. Semakov, V.G. Kulichikhin, 2015, published in Vysokomolekulyarnye Soedineniya. Ser. A, 2015, Vol. 57, No. 6, pp. 562–567.
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Malkin, A.Y., Semakov, A.V. & Kulichikhin, V.G. High-rate deformation of polymer melts as discrete media: Justification of the model. Polym. Sci. Ser. A 57, 904–909 (2015). https://doi.org/10.1134/S0965545X15060152
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DOI: https://doi.org/10.1134/S0965545X15060152