Measurement and modeling of uniaxial and planar extensional viscosities for linear isotactic polypropylenes

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F23%3A63564938" target="_blank" >RIV/70883521:28110/23:63564938 - isvavai.cz</a>
Result on the web
<a href="https://pubs.aip.org/aip/pof/article/35/1/013105/2867070/Measurement-and-modeling-of-uniaxial-and-planar" target="_blank" >https://pubs.aip.org/aip/pof/article/35/1/013105/2867070/Measurement-and-modeling-of-uniaxial-and-planar</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1063/5.0138220" target="_blank" >10.1063/5.0138220</a>

Result language
angličtina
Original language name
Measurement and modeling of uniaxial and planar extensional viscosities for linear isotactic polypropylenes
Original language description
"In this work, novel rectangular and circular orifice (zero-length) dies were used to measure planar and uniaxial extensional viscosities as a function of strain rate for various linear isotactic polypropylene melts by using Cogswell methodology. The obtained experimental data were combined with shear and uniaxial extensional viscosity data determined at very high strain rates. The ability of the molecularized generalized Newtonian fluid (mGNF) [M. Zatloukal and J. Drabek, ""Generalized Newtonian fluid constitutive equation for polymer liquids considering chain stretch and monomeric friction reduction for very fast flows modeling, "" Phys. Fluids 33(8), 083106 (2021)], Giesekus, and explicit Yao constitutive equations to describe the measured data was tested. It has been shown that including the effect of the chemical environment (i.e., the role of the oligomeric solvent) using a simplified version of the mGNF constitutive equation (instead of the commonly used Newton's law) can significantly improve the ability of the Giesekus and Yao viscoelastic constitutive equations to describe the measured experimental data, especially at very high strain rates with using adjustable parameters with a clear physical meaning."
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10404 - Polymer science

Project
<a href="/en/project/GA21-09174S" target="_blank" >GA21-09174S: Viscoelastic non-isothermal modeling of film extrusion process for membranes production including flow induced crystallization</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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