Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇)
The steady-state shear viscosity η(γ̇)\eta (\dot{\gamma }) is required in controlling processing parameters for the extrusion processing of polymer melts. A new method, the so-called ramp test, is investigated in this study to obtain the steady-state shear viscosity with a closed cavity rheometer (C...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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De Gruyter
2023-05-01
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| Series: | Applied Rheology |
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| Online Access: | https://doi.org/10.1515/arh-2022-0149 |
| _version_ | 1797817339853406208 |
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| author | Ellwanger Felix Georgantopoulos Christos K. Karbstein Heike P. Wilhelm Manfred Azad Emin M. |
| author_facet | Ellwanger Felix Georgantopoulos Christos K. Karbstein Heike P. Wilhelm Manfred Azad Emin M. |
| author_sort | Ellwanger Felix |
| collection | DOAJ |
| description | The steady-state shear viscosity η(γ̇)\eta (\dot{\gamma }) is required in controlling processing parameters for the extrusion processing of polymer melts. A new method, the so-called ramp test, is investigated in this study to obtain the steady-state shear viscosity with a closed cavity rheometer (CCR). To verify the method and the accuracy of the CCR data, three commercial polyolefin polymers, a low-density polyethylene (LDPE), a linear low-density polyethylene (LLDPE), and a polybutadiene (PBD), were used as model systems. Measurements of the magnitude of the complex viscosity ∣η⁎(ω)∣| {\eta }^{\ast }(\omega )| were compared with the steady-state shear viscosity data obtained by capillary rheometer and CCR. Further, time–temperature superposition master curves of the magnitude of the complex viscosity and steady-state shear viscosity obtained by CCR were developed for LLDPE and PBD. The influence of the cavity sealing on the instrument’s accuracy to obtain the steady-state shear viscosity was investigated using the finite element method simulations. Thus, it was shown that the ramp test performed by CCR is a practical method to determine reliable and reproducible data of the steady-state shear viscosity within a wide range of temperatures (T = 50–180°C) for low and high viscous materials (∣η⁎(ω)∣| {\eta }^{\ast }(\omega )| = 1.6–480 kPa s, M
w = 144–375 kg mol−1). |
| first_indexed | 2024-03-13T08:52:01Z |
| format | Article |
| id | doaj.art-2dd50d453de843d981599575201f9168 |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-03-13T08:52:01Z |
| publishDate | 2023-05-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-2dd50d453de843d981599575201f91682023-05-29T09:21:46ZengDe GruyterApplied Rheology1617-81062023-05-013316912610.1515/arh-2022-0149Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇)Ellwanger Felix0Georgantopoulos Christos K.1Karbstein Heike P.2Wilhelm Manfred3Azad Emin M.4Karlsruhe Institute of Technology (KIT), Institute of Process Engineering in Life Sciences, Chair of Food Process Engineering (LVT), Gotthard-Franz-Straße 3, 76131Karlsruhe, GermanyVAT Vakuumventile AG, Material and Manufacturing Technology, Core Technology, Seelistrasse 1, 9469Haag, SwitzerlandKarlsruhe Institute of Technology (KIT), Institute of Process Engineering in Life Sciences, Chair of Food Process Engineering (LVT), Gotthard-Franz-Straße 3, 76131Karlsruhe, GermanyKarlsruhe Institute of Technology (KIT), Institute of Chemical Technology and Polymer Chemistry (ITCP), Engesserstraße 18, 76131Karlsruhe, GermanyKarlsruhe Institute of Technology (KIT), Institute of Process Engineering in Life Sciences, Chair of Food Process Engineering (LVT), Gotthard-Franz-Straße 3, 76131Karlsruhe, GermanyThe steady-state shear viscosity η(γ̇)\eta (\dot{\gamma }) is required in controlling processing parameters for the extrusion processing of polymer melts. A new method, the so-called ramp test, is investigated in this study to obtain the steady-state shear viscosity with a closed cavity rheometer (CCR). To verify the method and the accuracy of the CCR data, three commercial polyolefin polymers, a low-density polyethylene (LDPE), a linear low-density polyethylene (LLDPE), and a polybutadiene (PBD), were used as model systems. Measurements of the magnitude of the complex viscosity ∣η⁎(ω)∣| {\eta }^{\ast }(\omega )| were compared with the steady-state shear viscosity data obtained by capillary rheometer and CCR. Further, time–temperature superposition master curves of the magnitude of the complex viscosity and steady-state shear viscosity obtained by CCR were developed for LLDPE and PBD. The influence of the cavity sealing on the instrument’s accuracy to obtain the steady-state shear viscosity was investigated using the finite element method simulations. Thus, it was shown that the ramp test performed by CCR is a practical method to determine reliable and reproducible data of the steady-state shear viscosity within a wide range of temperatures (T = 50–180°C) for low and high viscous materials (∣η⁎(ω)∣| {\eta }^{\ast }(\omega )| = 1.6–480 kPa s, M w = 144–375 kg mol−1).https://doi.org/10.1515/arh-2022-0149steady-state shear viscosityclosed cavity rheometerramp testtime–temperature superpositionnumerical simulation |
| spellingShingle | Ellwanger Felix Georgantopoulos Christos K. Karbstein Heike P. Wilhelm Manfred Azad Emin M. Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇) Applied Rheology steady-state shear viscosity closed cavity rheometer ramp test time–temperature superposition numerical simulation |
| title | Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇) |
| title_full | Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇) |
| title_fullStr | Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇) |
| title_full_unstemmed | Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇) |
| title_short | Application of the ramp test from a closed cavity rheometer to obtain the steady-state shear viscosity η(γ̇) |
| title_sort | application of the ramp test from a closed cavity rheometer to obtain the steady state shear viscosity η γ̇ |
| topic | steady-state shear viscosity closed cavity rheometer ramp test time–temperature superposition numerical simulation |
| url | https://doi.org/10.1515/arh-2022-0149 |
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