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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

&quot;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, &quot;&quot;Generalized Newtonian fluid constitutive equation for polymer liquids considering chain stretch and monomeric friction reduction for very fast flows modeling, &quot;&quot; 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&apos;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.&quot;

Název v anglickém jazyce

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

Popis výsledku anglicky

&quot;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, &quot;&quot;Generalized Newtonian fluid constitutive equation for polymer liquids considering chain stretch and monomeric friction reduction for very fast flows modeling, &quot;&quot; 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&apos;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.&quot;

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA21-09174S" target="_blank" >GA21-09174S: Viskoelastické neizotermální modelování procesu vytlačování polymerních fólií pro výrobu membrán zahrnující tokem indukovnou krystalizaci</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2023

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physics of Fluids

ISSN

1070-6631

e-ISSN

1089-7666

Svazek periodika

35

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

11

Strana od-do

—

Kód UT WoS článku

000911212900021

EID výsledku v databázi Scopus

2-s2.0-85146113409