Advances in Determination of Extensional Viscosities for Polymer Melts from Entrance Pressure Drop Measurements
The result's identifiers
Result code in 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>
Result on the web
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DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Advances in Determination of Extensional Viscosities for Polymer Melts from Entrance Pressure Drop Measurements
Original language description
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.
Czech name
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Czech description
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Classification
Type
O - Miscellaneous
CEP classification
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OECD FORD branch
10404 - Polymer science
Result continuities
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)
Others
Publication year
2023
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů