Advances in Determination of Extensional Viscosities for Polymer Melts from Entrance Pressure Drop Measurements

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F23%3A63569118" target="_blank" >RIV/70883521:28110/23:63569118 - 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

Advances in Determination of Extensional Viscosities for Polymer Melts from Entrance Pressure Drop Measurements

Popis výsledku v původním jazyce

New circular and rectangular multi-piece orifice dies were used to determine uniaxial and planar extensional viscosities of linear and branched polyolefin melts from entrance pressure drop measurements using a high-pressure capillary rheometer. The new orifice die design suppresses sticking of the material at the die exit, which enables accurate measurement of the entrance pressure drop and precise evaluation of the extrudate swell. The multi-piece nature of the orifice dies makes it possible to reduce the dimensions of the flow channel significantly, which enables measurements of shear and extensional viscosities at extremely high strain rates. The new concept also allows the maximum achievable Hencky strain to be set at a constant extensional strain rate. The ability of different constitutive equations to describe the measured data was tested. The obtained results are considered valuable with respect to the optimization of the film casting process for the production of polymeric energy storage membranes. The authors wish to acknowledge the Grant Agency of the Czech Republic (Grant No. 21–09174S) for the financial support and NETZSCH Gerätebau GmbH for providing the Rosand RH10-2 capillary rheometer.

Název v anglickém jazyce

Advances in Determination of Extensional Viscosities for Polymer Melts from Entrance Pressure Drop Measurements

Popis výsledku anglicky

New circular and rectangular multi-piece orifice dies were used to determine uniaxial and planar extensional viscosities of linear and branched polyolefin melts from entrance pressure drop measurements using a high-pressure capillary rheometer. The new orifice die design suppresses sticking of the material at the die exit, which enables accurate measurement of the entrance pressure drop and precise evaluation of the extrudate swell. The multi-piece nature of the orifice dies makes it possible to reduce the dimensions of the flow channel significantly, which enables measurements of shear and extensional viscosities at extremely high strain rates. The new concept also allows the maximum achievable Hencky strain to be set at a constant extensional strain rate. The ability of different constitutive equations to describe the measured data was tested. The obtained results are considered valuable with respect to the optimization of the film casting process for the production of polymeric energy storage membranes. The authors wish to acknowledge the Grant Agency of the Czech Republic (Grant No. 21–09174S) for the financial support and NETZSCH Gerätebau GmbH for providing the Rosand RH10-2 capillary rheometer.

Druh

O - Ostatní výsledky

CEP obor

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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