Mesoscopic single and multi-mode rheological models for a description of polymeric fluids flows

0454841 - ÚH 2016 FR eng C - Konferenční příspěvek (zahraniční konf.)
Merzlikina, D.A. - Pyshnograi, I.G. - Pyshnograi, G. - Mikhail, T.U. - Filip, Petr - Pivokonský, Radek
Mesoscopic single and multi-mode rheological models for a description of polymeric fluids flows.
10th Annual European Rheology Conference, Book of Abstracts. Nantes: GFR, 2015.
[10th Annual European Rheology Conference. Nantes (FR), 14.04.2015-17.04.2015]
Institucionální podpora: RVO:67985874
Klíčová slova: The single-mode Vinogradov-Pokrovskii model * The multi-mode Vinogradov-Pokrovskii model * polyethylenes
Kód oboru RIV: BK - Mechanika tekutin

In polymer processing, branched polymeric materials exhibiting polydispersity are often used. Therefore, it is necessary to apply multi-mode rheological models respecting different relaxation times and viscosities characterizing diverse fractions in morphological arrangement of the studied materials. The single-mode Vinogradov-Pokrovskii model is generalised for the case of a multi-mode approach. The parameters participating in the determination of an internal friction are expressed with the help of the first invariant of the anisotropy tensor. The multi-mode version of the Vinogradov-Pokrovskii model enables a description of relatively slow flows of both linear and branched polymeric materials using a common theoretical approach. The generalised model was used for a description of behaviour of two branched low density polyethylenes and the comparison with the experimental data exhibits a good agreement.
Trvalý link: http://hdl.handle.net/11104/0255474