Crystallization and Entanglement of Ultra-high Molecular Meight Polyethylene
il y a 4 semaines
**Crystallization and Entanglement of Ultra-High Molecular Meight Polyethylene**:
- Réf **ABG-127525**
- Stage master 2 / Ingénieur
- Durée 6 mois
- Salaire net mensuel ~ 500€
- 11/12/2024
- Laboratoire CP2M (CNRS/UCBL/CPE Lyon). UMR 5128
- Lieu de travail- Villeurbanne Auvergne-Rhône-Alpes France
- Champs scientifiques- Chimie
- Mots clés- polymer chemistry- 01/02/2025
**Établissement recruteur**:
**Description**:
State of the art
Ultra-high molecular weight polyethylene (UH) is an exceptional material with a molecular weight exceeding one million g/mol, offering remarkable physical properties, including high resistance to abrasion, impact, and fatigue. While extensive entanglement of these exceedingly long UH chains enhances the polymer's toughness it also presents a challenge, as it leads to elevated melt viscosity, making the processing of entangled UH a challenging task. To address this, processing methods include using high pressure to provoke a reorganization of the entangled chains or disentangling the polymer chains through dilution with solvents (decalin) which involves large amounts of poisonous solvents such as decalin. An alternative route involves the direct synthesis of disentangled UH reactor powder.[1]
Project position
- Objectives:
- Characterize the UH microstructure using SAXS/WAXS experiment
- Analyze the melting/crystallization kinetics of UH by Flash-DSC
- Study the entanglement kinetics using rheological measurements and HR-MAS solid-state NMR spectrometry
Reference
[1] Kurtz, The UHMWPE Handbook, 2004 (DOI :10.1016/B978-0-12-429851-4.X5000-1)
[2] Roberta Lopes do Roasario, PhD thesis UCBL
[3] Lopes do Rosario et al. J. Polym. Sci. 2022 (DOI :10.1002/pol.20230038)
**Profil**:
**Prise de fonction**:
- 03/03/2025
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