Effect of FreeFlow orifice die design on extensional viscosity determination from entrance pressure drop measurements

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F24%3A63580518" target="_blank" >RIV/70883521:28110/24:63580518 - 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

Effect of FreeFlow orifice die design on extensional viscosity determination from entrance pressure drop measurements

Original language description

This work deals with the experimental research on the effects of the FreeFlow orifice die design on the entrance pressure drop for the uniaxial extensional viscosity determination using high-pressure capillary rheometer. Tests were carried out for two different polyolefins at different temperatures, strains and strain rates with a specific emphasis on understanding the effect of the contraction ratio (achieved by changing the diameter of the barrel while maintaining a constant diameter of the FreeFlow orifice die) on the measured entrance pressure drop for branched low-density polyethylene. Uniaxial extensional viscosity was determined by the Gibson method [1], the original Cogswell method [2], and the modified Cogswell method proposed by Padmanabhan [3], which were compared with independent measurements made using the Sentmanat extensional rheometer.Acknowledgement:The authors wish to acknowledge the Grant Agency of the Czech Republic (Grant No. 24-11442S) for the financial support and NETZSCH Gerätebau GmbH for providing the Rosand RH10-2 capillary rheometer. The authors would also like to thank Levente Szántó from NETZSCH Gerätebau GmbH for his support.[1] A.G. Gibson, Die entry flow of reinforced polymers, Composites 20(1), 57-64, 1989.[2] F.N. Cogswell, Converging flow of polymer melts in extrusion dies, Polymer Engineering and Science 12(1), 64-73, 1972.[3] M. Padmanabhan, Evaluation of the entrance pressure drop method to estimate extensional viscosity. Master Thesis, Supervisor: Prof. Chris Macosko. Minesota: University of Minnesota, Department of Chemical Engineering and Materials Science, 1993.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

<a href="/en/project/GA24-11442S" target="_blank" >GA24-11442S: Rheology and modeling of polymer melt flows at very high strain rates with respect to the production of meltblown nanofibers</a><br>

Continuities

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

Publication year

2024

Confidentiality

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