Evaluation of planar and uniaxial extensional viscosities for different polyolefins

Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Evaluation of planar and uniaxial extensional viscosities for different polyolefins
Original language description
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
Czech name
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Czech description
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2013
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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