Evaluation of planar and uniaxial extensional viscosities for different polyolefins

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F13%3A43870108" target="_blank" >RIV/70883521:28610/13:43870108 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Evaluation of planar and uniaxial extensional viscosities for different polyolefins

Popis výsledku v původním jazyce

In this work, novel rectangle and circular orifice dies have been utilized for planar and uniaxial extensional viscosity measurements by using standard twin bore capillary rheometer and Cogswell model and the capability of different constitutive equations to describe the measured experimental data has been tested. It has been showed that chain branching causes the strain hardening occurrence in both, unixial and planar extensional viscosities and its maximum is shifted to the higher strain rates if thetemperature is increased. The level of uniaxial extensional strain hardening for the branched LDPE sample has been found to be higher in comparison with the planar extensional viscosity within wide range of temperatures. It has been found that predictingcapability of the tested constitutive equations for the planar extensional viscosity can be rather poor if the corresponding experimental data are not utilized in the particular constitutive equation non-linear parameters identification

Název v anglickém jazyce

Evaluation of planar and uniaxial extensional viscosities for different polyolefins

Popis výsledku anglicky

In this work, novel rectangle and circular orifice dies have been utilized for planar and uniaxial extensional viscosity measurements by using standard twin bore capillary rheometer and Cogswell model and the capability of different constitutive equations to describe the measured experimental data has been tested. It has been showed that chain branching causes the strain hardening occurrence in both, unixial and planar extensional viscosities and its maximum is shifted to the higher strain rates if thetemperature is increased. The level of uniaxial extensional strain hardening for the branched LDPE sample has been found to be higher in comparison with the planar extensional viscosity within wide range of temperatures. It has been found that predictingcapability of the tested constitutive equations for the planar extensional viscosity can be rather poor if the corresponding experimental data are not utilized in the particular constitutive equation non-linear parameters identification

Druh

O - Ostatní výsledky

CEP obor

BK - Mechanika tekutin

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2013

Kód důvěrnosti údajů

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