Determination of uniaxial and planar extensional viscosity using a Rosand high-pressure capillary rheometer

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Determination of uniaxial and planar extensional viscosity using a Rosand high-pressure capillary rheometer

Popis výsledku v původním jazyce

Melt processability highly depends on the rheological properties of materials, such as shear- (ηs) and extensional (ηe) viscosity [1]. Using a high-pressure capillary rheometer and employing a long die and a zero-length (orifice) die, crucial data can be gathered. Applying the Cogswell method [2], measuring the entrance pressure drop (Pen), the ηe can be investigated. However, there is the possibility that material leaving the orifice die sticks to the wall [3,4] leading to overestimated (Pen) and incorrect (ηe). During processing, typically the uniaxial and planar (ηe) plays a critical role. Generation of pure planar flow is complicated and is considered unsuitable for routine use [5]. Based on the pioneering work of Zatloukal et al. [4,6], current designs of ROSAND dies have been optimized to create a new series of FreeFlow circular and rectangular orifice dies. These dies prevent the possibility of overestimating the (Pen), allowing precise determination of uniaxial and planar (ηe). In addition, FreeFlow dies enables a new way of evaluating extrudate swell, which is frequently missed or overestimated using conventional orifice dies. Measurements using the ROSAND high-pressure capillary rheometer can now provide in-depth studies of extrudate swell, uniaxial and planar (ηe).[1] Münstedt H., Elastic Behavior of Polymer Melts, 2019, pp. 1-2.[2] Cogswell F. N., Polym. Eng. Sci., 12(1), (1972) 64-73.[3] Aho J., Syrjälä S., Annual Transactions of the NRS, 14, 2006.[4] Zatloukal M., Musil J., Polym. Test. 28(8) (2009) 843-853.[5] Dealy J. M., Read D. J., Larson R. G., Structure and Rheology of Molten Polymers, 2nd Edition, 2018, pp. 443[6] Zatloukal M., Polymer 104 (2016) 258-267.

Název v anglickém jazyce

Determination of uniaxial and planar extensional viscosity using a Rosand high-pressure capillary rheometer

Popis výsledku anglicky

Melt processability highly depends on the rheological properties of materials, such as shear- (ηs) and extensional (ηe) viscosity [1]. Using a high-pressure capillary rheometer and employing a long die and a zero-length (orifice) die, crucial data can be gathered. Applying the Cogswell method [2], measuring the entrance pressure drop (Pen), the ηe can be investigated. However, there is the possibility that material leaving the orifice die sticks to the wall [3,4] leading to overestimated (Pen) and incorrect (ηe). During processing, typically the uniaxial and planar (ηe) plays a critical role. Generation of pure planar flow is complicated and is considered unsuitable for routine use [5]. Based on the pioneering work of Zatloukal et al. [4,6], current designs of ROSAND dies have been optimized to create a new series of FreeFlow circular and rectangular orifice dies. These dies prevent the possibility of overestimating the (Pen), allowing precise determination of uniaxial and planar (ηe). In addition, FreeFlow dies enables a new way of evaluating extrudate swell, which is frequently missed or overestimated using conventional orifice dies. Measurements using the ROSAND high-pressure capillary rheometer can now provide in-depth studies of extrudate swell, uniaxial and planar (ηe).[1] Münstedt H., Elastic Behavior of Polymer Melts, 2019, pp. 1-2.[2] Cogswell F. N., Polym. Eng. Sci., 12(1), (1972) 64-73.[3] Aho J., Syrjälä S., Annual Transactions of the NRS, 14, 2006.[4] Zatloukal M., Musil J., Polym. Test. 28(8) (2009) 843-853.[5] Dealy J. M., Read D. J., Larson R. G., Structure and Rheology of Molten Polymers, 2nd Edition, 2018, pp. 443[6] Zatloukal M., Polymer 104 (2016) 258-267.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

10404 - Polymer science

Projekt

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Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2024

Kód důvěrnosti údajů

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