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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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Peuvrel-Disdier, Edith
Mines Paris - PSL
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (32/32 displayed)
- 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
- 2022Rheology: A sensitive technique to probe the nanofiller organization in polymer nanocomposites
- 2021Analysis and Modelling of Extrusion Foaming Behaviour of Low-Density Polyethylene using Isobutane and CO2
- 2021Microscale modelling of the cellularization of a rubber compound in injection moulding conditions
- 2019Self-organization of sepiolite fibbers in a biobased thermosetcitations
- 2018Crystallization behavior of polypropylene/graphene nanoplatelets compositescitations
- 2018Study of the partial wetting morphology in polylactide/poly[(butylene adipate)-co-terephthalate]/polyamide ternary blends: case of composite dropletscitations
- 2017Structure and properties of polypropylene/graphene nanoplatelets microcomposites: effect of graphene size.
- 2017Structural, thermal, rheological and mechanical properties of polypropylene/graphene nanoplatelets composites: Effect of particle size and melt mixing conditionscitations
- 2017Preparation of polypropylene nanocomposites by melt-mixing: Comparison between three organoclayscitations
- 2017Attempts to Optimize the Dispersion State during Twin-Screw Extrusion of Polypropylene/Clay Nanocompositescitations
- 2016Matrix Degradation during High Speed Extrusion of Polypropylene/Clay Nanocomposites – Influence on Filler Dispersioncitations
- 2015Structuration of organoclay/polypropylene nanocomposites during twin screw extrusion process
- 2015The effect of extrusion conditions on the dispersion of an organoclay in a polypropylene matrix
- 2015Polypropylene/Organoclay Based Nanocomposites: The Influence of Processing Conditions on the Filler Dispersion State
- 2015The influence of matrix viscosity on the dispersion of nanoclay in polypropylene by melt-mixing
- 2014Formation of Fractal-like Structure in Organoclay-Based Polypropylene Nanocompositescitations
- 2013CONTROL OF THE MORPHOLOGY OF PLA/PBAT/PA TERNARY BLENDS THROUGH THE USE OF A PBAT-B-PLA COPOLYMER
- 2013The importance of specific mechanical energy during twin screw extrusion of organoclay based polypropylene nanocompositescitations
- 2012Influence of twin-screw processing conditions on structure and properties of polypropylene - Organoclay nanocompositescitations
- 2012Time-evolution of the structure of organoclay/polypropylene nanocomposites and application of the time/temperature superposition principlecitations
- 2012Shear-induced structure evolution in organoclay/polypropylene nanocomposites: transient behaviour and relaxation.
- 2011Influence of twin-screw extrusion processing conditions on the structure of nanocomposites and characterization by rheometry
- 2011Time-evolution of the structure of organoclay/ polypropylene nanocomposites and its influence on time/temperature superposition principle
- 2011Nanocomposites à matrice polypropylène : caractérisation de l'état de dispersion et suivi de l'évolution microstructurale par rhéologie
- 2011Influence of twin-screw processing conditions on structure and properties of polypropylene - organoclay nanocomposites
- 2008In situ characterisation of dispersion processes of silica in an elastomer matrix under shear, impact of a filler treatment
- 2005Dispersion mechanisms of carbon black in elastomers
Places of action
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document
Extrusion foaming of linear and branched polypropylenes - Input of the thermomechanical analysis of pressure drop in the die
Abstract
This study aims at a better understanding of the polypropylene (PP) foamability by physical extrusion foaming.Trials were conducted in a single screw extruder 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 this temperature on the PP foamability and on the pressure drop in the die is analyzed. The behavior of branched and linear PP grades is compared. The foam density of branched PPs varies from high to low values while decreasing the foaming temperature. In the same processing conditions, the foam density of linear PPs does not decrease so much as already evidenced in the literature. The foamability transition coincides with an increase of the pressure drop in the die.The thermomechanical analysis of the polymer flow in the die is used to identify the relevant physical phenomena for a good foamability. The comparison of experimental pressure drops in the die and computed ones (analytical expressions for converging and capillary dies with identified purely viscous behaviors) points out the influence of the foaming temperature and of the polypropylene structure. At high foaming temperature the discrepancy between experimental and computed pressure drops remains limited. It increases when decreasing the foaming temperature, but the mismatch is much more important for branched PPs than for linear ones. This difference is analyzed as a combination of the activation energy of the viscosity, extensional flow in the converging part of the die, and onset of crystallization in the die.These hypotheses will be examined and discussed for the different polymer grades in order to clarify the physical scenario for the foaming process [1].Reference : 1. Sandino C., Peuvrel-Disdier E., Agassant J.F., Laure P., Boyer S.A.E., Hibert G., Y. Trolez Y., Extrusion foaming of linear and branched polypropylenes-Input of the thermomechanical analysis of pressure drop in the die, Intern. Polym. Proc., 2022 accepted