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

Result code in IS VaVaI

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Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

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

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2024

Confidentiality

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