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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Fages, Jacques
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (19/19 displayed)
- 2023Foaming of PLA biocomposites by supercritical CO2 assisted extrusion process
- 2023Foaming of PLA biocomposites by supercritical CO2 assisted extrusion process
- 2021PLA-based biocomposites foaming by supercritical CO2 assisted batch process
- 2021PLA-based biocomposites foaming by supercritical CO2 assisted batch process
- 2021Blending and foaming thermoplastic starch with poly (lactic acid) by CO 2 ‐aided hot melt extrusioncitations
- 2021Foaming of PLA-based Biocomposites by Supercritical CO2 Assisted Batch Process : Effect of Processing and Cellulose Fibres on Foam Microstructure
- 2021Foaming of PLA-based Biocomposites by Supercritical CO2 Assisted Batch Process : Effect of Processing and Cellulose Fibres on Foam Microstructure
- 2017Modelling Nucleation and Cell Size During the Continuous Process of Extrusion Assisted by Supercritical CO 2
- 2016Characterisation of natural fibre reinforced PLA foams prepared by supercritical CO 2 assisted extrusioncitations
- 2012Use of supercritical CO2-aided and conventional melt extrusion for enhancing the dissolution rate of an active pharmaceutical ingredientcitations
- 2011On-line rheological measurement of a binary mixture polymer/sc-CO2 in an extruder
- 2011New challenges in polymer foaming: A review of extrusion processes assisted by supercritical carbon dioxidecitations
- 2010Biosourced polymer foam production using a (SC CO2) -assisted extrusion process
- 2008A new supercritical co-injection process to coat microparticlescitations
- 2008Application of the Markov chain theory for modelling residence time distribution in a single screw extruder
- 2007Microencapsulation by a solvent-free supercritical fluid process : use of density, calorimetric, and size analysis to quantify and qualify the coatingcitations
- 2004A new test for cleaning efficiency assessment of cleaners for hard surfacescitations
- 2004Supercritical carbon dioxide : an efficient tool for the production of ultra-fine particles for the food and pharmaceutical industries
- 2002Extraction and precipitation particle coating using supercritical CO2citations
Places of action
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conferencepaper
On-line rheological measurement of a binary mixture polymer/sc-CO2 in an extruder
Abstract
This study is to be seen in the context of the replacement of oil-based polymers by new bio- sourced ones having the same end-user properties. It is also important to use green chemical engineering to process them in a more environmental friendly way. The use of supercritical fluids appears then, to be a promising route. The most interesting fluid is supercritical carbon dioxide (sc-CO2), which is soluble in quite significant quantities in many molten polymers, where it acts as a plasticizer and a swelling agent. It is known to be a green processing agent used, for instance, such as blending of polymers, polymer foaming, particle formation or polymerisation process. The easiest and most used way of processing polymers in continuous mode is to use an extruder that provides a high shear rate, particularly in the die. Our lab has developed a process coupling single-screw extrusion and sc-CO2. Understanding and improving such process require data, like the solubility of CO2 into the polymer, the diffusion coefficient and the viscosity of the mix. We have then developed an on-line measurement of the viscosity based on capillary rheometry. The method was validated by measurements on a classic capillary rheometer. Both data sets were found in good agreement. This method was applied to characterize the rheology of a bio-sourced polymer (BsP) itself and of the polymer-CO2 binary system. A pseudoplastic fluid behaviour was observed with a 30 % decrease of the viscosity from 46 to 32 Pa.s at about 5000 s-1 and 220°C, upon addition of carbon dioxide. The rheological data were correlated with solubility data and analysed in function of the process parameters. It was observed that the decrease of the viscosity with the amount of CO2 dropped to a plateau before reaching the thermodynamic solubility. It seems that the limitations are due to the kinetics of dissolution and mixing. The higher the shear stress, the higher the amount of CO2 at which the viscosity plateau is reached. This is an indication of a better CO2 dissolution rate when the speed of the screw increases. Therefore, those measurements may quantify the impact of the CO2 on the rheology of the system but also of the efficiency of the mixing process in our experimental setup.