| People | Locations | Statistics |
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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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Laure, Patrice
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (23/23 displayed)
- 20233D real time and in situ observation of the fibre orientation during the plane strain flow of concentrated fibre suspensionscitations
- 2022Cellularization modeling of a rubber compound in injection molding conditions
- 2022Cellularization modeling of a rubber compound in injection molding conditions
- 2022Foamability of linear and branched polypropylenes by physical extrusion foaming - Input of the thermomechanical analysis of pressure drop in the die
- 2022Extrusion foaming of linear and branched polypropylenes - Input of the thermomechanical analysis of pressure drop in the die
- 2022Analysis and Modelling of Extrusion Foaming Behaviour of Polyolefins using Isobutane and CO2
- 2021Analysis and Modelling of Extrusion Foaming Behaviour of Low-Density Polyethylene using Isobutane and CO2
- 2021Short fiber composite reinforcementscitations
- 2021Microscale modelling of the cellularization of a rubber compound in injection moulding conditions
- 2019Fibre kinematics in dilute non-Newtonian fibre suspensions during confined and lubricated squeeze flow: direct numerical simulation and analytical modellingcitations
- 2016On the Numerical Modeling of Fiber-reinforced Composites:Towards Industrial Applications
- 2016On the Numerical Modeling of Fiber-reinforced Composites:Towards Industrial Applications
- 2016Multiphysics for simulation of forming processes
- 20163D real-time and in situ characterisation of fibre kinematics in dilute non-Newtonian fibre suspensions during confined and lubricated compression flowcitations
- 2015Direct Numerical Simulation of a rheology model for fibre-reinforced composites
- 2015Direct Numerical Simulation of a rheology model for fibre-reinforced composites
- 2015Numerical Modelling of Molding Compression Of Fibre-Reinforced Composites for Industrial applications
- 2015Numerical Modelling of Molding Compression Of Fibre-Reinforced Composites for Industrial applications
- 2015Numerical Implementation of a Rheology Model for Fiber-Reinforced Composite and Viscous Layer Approach for Friction Studycitations
- 2012A new three-dimensional mixed finite element for direct numerical simulation of compressible viscoelastic flows with moving free surfacescitations
- 2007Injection molding simulation : Taking into account the process history to predict the anisotropy in the end-use propertiescitations
- 2005Simulations numériques d'écoulements de fluides complexes à l'échelle microscopique : un nouvel outil de rhéologie
- 2004Direct Calculation of the motion of rigid fibres in a viscous fluidcitations
Places of action
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conferencepaper
Foamability of linear and branched polypropylenes by physical extrusion foaming - Input of the thermomechanical analysis of pressure drop in the die
Abstract
This study aims to better understand the polypropylene (PP) foamability by physical extrusion foaming comparing branched chains with strain hardening versus linear ones. Trials were conducted in a single screw extrusion equipped with a gear pump for the gas dissolution step (same extrusion parameters, 1wt% CO2) and a static mixer cooler allowing to decrease the melt temperature before the final die (referred as foaming temperature). The effect of decreasing the foaming temperature on the PP foamability was analyzed.The foam density of branched PP varies from high to low values while decreasing the foaming temperature. This foamability transition coincides with an increase of the pressure drop in the die. As reported, branched PPs depict a better foamability than linear grades. As the pressure drop in the die is responsible of the polymer foaming, a thermomechanical analysis of the polymer flow was conducted to better understand the foamability transition.The pressure drop was calculated in the die using dedicated analytical expressions for the converging and capillary parts and a power law for the viscosity curve. Calculated pressures are lower than the measured values. The discrepancy is interpreted as an additional contribution due to the elongational flow in the converging channel, which can be estimated. The pressure drop variation with the foaming temperature follows an Arrhenius dependence in the case of linear grades. In the case of branched grades, the Arrhenius dependence is valid for large foaming temperatures but a large discrepancy is reported for low foaming temperatures. Two phenomena (presence of strain hardening for branched PP and/or of crystallization) can be at the origin of this discrepancy. These hypotheses will be examined and discussed for the different polymer grades in order to clarify the physical scenario for the foaming process.