Mesoscopic single and multi-mode rheological models for polymeric melts viscometric flows description

0503720 - ÚH 2019 RIV FR eng J - Journal Article
Pyshnograi, G. - Merzlikina, D.A. - Filip, Petr - Pivokonský, Radek
Mesoscopic single and multi-mode rheological models for polymeric melts viscometric flows description.
WSEAS Transactions on Heat and Mass Transfer. Roč. 13, č. 2018 (2018), s. 49-65. ISSN 1790-5044
R&D Projects: GA ČR GA103/09/2066
Institutional support: RVO:67985874
Keywords : constitutive equations * mesoscopic approach * polymer dynamics * polymer melts * viscometric flows * viscoelasticity
OECD category: Fluids and plasma physics (including surface physics)
http://www.wseas.org/multimedia/journals/heat/2018/a105912-148.php

The Vinogradov and Pokrovskii rheological model was extended for a description of rheological behaviour of branched polymer melts. Since stationary elongational viscosity is a nonmonotonic function of the elongational rate, it required a generalization of the law of internal friction for beads of macromolecule. To achieve high prediction accuracy was proposed multi-mode approximation. The contribution of each independent mode to a stress tensor corresponds to the individual polymer fractions differing in relaxation time and viscosity. The theoretical predictions of the generalized model provide a good agreement with the measured steady and transient rheological characteristics of two samples branched low density polyethylenes.
Permanent Link: http://hdl.handle.net/11104/0295515