| 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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Stoclet, Grégory
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (14/14 displayed)
- 2023Structure And Mechanical Behavior of Fully Substituted Acid Starch Esterscitations
- 2022Effect of chain orientation on the brittle to ductile transition in Polylactide
- 2022Novel family of polylactide-based copolymer matrix composites by RTM process
- 2022Hydrolytic degradation of biodegradable poly(butylene adipate-co-terephthalate) (PBAT) - Towards an understanding of microplastics fragmentationcitations
- 2022Unprecedented polylactide-based copolymer matrix composites by Resin Transfer Molding
- 2021Comparative studies of thermal and mechanical properties of macrocyclic versus linear polylactidecitations
- 2021Poly(lactide)/cellulose nanocrystal nanocomposites by high‐shear mixingcitations
- 2021Poly(lactide)/cellulose nanocrystal nanocomposites by high-shear mixingcitations
- 2020Comparative studies of thermal and mechanical properties of macrocyclic versus linear polylactidecitations
- 2019Effect of surface modification of colloidal silica nanoparticles on the rigid amorphous fraction and mechanical properties of amorphous polyurethane–urea–silica nanocompositescitations
- 2019Water–Soluble Extracts from Banana Pseudo–stem as Functional Additives for Polylactic Acid: Thermal and Mechanical Investigationscitations
- 2018Processing of PVDF-based electroactive/ferroelectric films: importance of PMMA and cooling rate from the melt state on the crystallization of PVDF beta-crystalscitations
- 2015Comparison of the influence of talc and kaolinite as inorganic fillers on morphology, structure and thermomechanical properties of polylactide based compositescitations
- 2014Isoprene-Styrene Chain Shuttling Copolymerization Mediated by a Lanthanide Half-Sandwich Complex and a Lanthanidocene: Straightforward Access to a New Type of Thermoplastic Elastomerscitations
Places of action
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conferencepaper
Effect of chain orientation on the brittle to ductile transition in Polylactide
Abstract
Polylactide (PLA) is one of the most promising biopolymers that actually takes part incommercialized biopolymer market. However, its intrinsic brittleness has found to be a major limit to a wider range of applications. Among the various chemical and physical approaches reported in literature aiming at improving the mechanical properties, biaxial stretching is known as an elaboration process that can improve the ductility of some brittle polymers. In this context, the goal of this work is to study the influence of chain orientation on the mechanical behavior of Polylactide (PLA).While isotropic PLA exhibits as expected a brittle behavior upon uniaxial tension at roomtemperature, pre-oriented PLA samples display a ductile behaviour with a strain at break exceeding 100%. In order to better understand the origin of this Brittle to Ductile (B-D) transition, both a crystallizable grade of PLA (C-PLA) and a non-crystallizable grade (NC-PLA) were studied to be able to separate the effects induced by macromolecular orientation from the ones due to crystalline phase. Through an in-depth structural characterization of the pre-oriented films, we have demonstrated that it is the macromolecular orientation in the amorphous phase which is the key parameter governing this B-D transition. Additionalstructural analyses by Small-Angle X-ray Scattering (SAXS) carried out in situ during the stretching of preoriented or non-oriented samples, combined with morphological observations, have shown that the B-D transition corresponds to a change in the elementary plasticity mechanisms: crazing, predominant in the case of brittle samples, gradually evolves toward the development of shear bands. Supplementary postmortem analyses by SAXS have also shown that the macromolecular orientation has no influence on the geometry of the cracks but induces a reduction in the density of cracks formed during stretching. From these analyses, the critical crack nucleation stress (σcr) as a function of the degree of orientation has beendetermined. It has thus been shown that the change in deformation mechanisms results from the increase in the crack initiation stress σcr with the macromolecular orientation while the shear band initiation stress is unchanged.