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

Kód výsledku v 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>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

<a href="/cs/project/GA24-11442S" target="_blank" >GA24-11442S: Reologie a modelování toků polymerních tavenin při velmi vysokých rychlostech deformace s ohledem na produkci meltblown nanovláken</a><br>

Návaznosti

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

Rok uplatnění

2024

Kód důvěrnosti údajů

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