Stage M2 : Elaboration and characterization of memory-shape PE-based thermoplastics for domestic pipe applications
Aalberts hydronic flow control is a division of the Aalberts Group, specializing in the design, manufacture, and marketing of building-integrated thermal solutions "from source to emitter". Through our two brands, COMAP and FLAMCO, we provide unique technological solutions that optimize systems, reduce energy consumption, and guarantee maximum user comfort. The Group's identity is based on entrepreneurial values. Each one of our employees is invited to take part in the company project through their own initiatives, in a spirit of continuous improvement and professional integrity. We grow by sharing experience, capitalizing on best practice, and our social responsibility is supported by actions in favor of sustainable development.
IMP is a joint research unit between the CNRS and Université de Lyon1. Its research activities range from the tailored synthesis of macromolecular architectures and polymer processing to the elaboration of complex materials and establishment of structure- properties relationships. The IMP gathers complementary skills: synthesis, structural characterization, and physico-chemical properties, in the fields of polymers and materials science.
Context
Domestic pipes can be described as pipes for hot and/or cold water in pressurized heating and drinking water networks within buildings. The domestic pipe market has been traditionally dominated by copper and galvanized steel pipe.
Over the last 25-30 years, plastics have made significant inroads in this market. Their advantages are no corrosion, resistant to many, flexible, easy to install and lightweight, which makes them easy to transport and to handle on site.
The dominating plastic material used in domestic pipe is PE (Polyethylene). Traditionally PE is not suita ble because of too low upper service temperature. Crosslinking of the polyethylene (PEX) is needed to obtain the desired long -term hydrostatic strength (LTHS) at high temperature. Nevertheless, the creation of a 3D network makes PEX very difficult to dispose/recycle wastes. A new generation Polyethylene of Raised Temperature Resistance (PERT) shows excellent LTHS without the need of crosslinking. However, PERT cannot meet all requirements, mainly due to the limited mechanical properties.
In Flex n’Fit project, the objective is to develop a new generation of ecofriendly, easy-to-fabricate and sustainable PE- based thermoplastics for domestic pipe applications.
The internship will take place in the Laboratoire Ingénierie des Matériaux Polymères (IMP). Travel to the Aalberts hfc in Lyon (twice per month) and factory in Nevers (Ideally bimonthly) are to be expected.
Candidate looks forward to working in a collaborative, multicultural, and open-minded team and must show enthusiasm, initiative, and autonomy. You are in Master 2 You should demonstrate a good knowledge in physico-chemistry of polymers and a strong inclination for experimentation and techniques of polymer characterization.
You are interested in continuing the internship by a doctoral study under co-supervision of R&D manager and funded by the Aalberts hfc.
Application material : cover letter, CV in French or English
Application deadline : January 10th, 2024
Starting date : February 15th, 2024 to March 31st, 2024 (very latest)
Contract duration : 6 months for the master’s program (possible PhD position follow-up)
Please send your complete application material with subject “Master Position Application Aalberts-IMP” to :
Dr. Fabrice GOUANVE fabrice.gouanve @ univ-lyon1.fr
STAGE M2 : Antibacterial activity and transport properties of polyethylene films loaded with nanoemulsions of plant extracts for food packaging applications
Context :
At the present time, most packaging materials are thermoplastics based on olefin polymers, for example, polyethylene (PE) and polypropylene (PP). They tend to be superior to other types of materials because of their low cost, light weight, high corrosion resistance and recyclability. However, one of their major drawbacks in food packaging is their lack of antimicrobial property. There had been many attempts to improve this property by the addition of various antimicrobial agents such as organic acids, inorganic gases, bacteriocins, silver metals, and others. Nevertheless, the use of synthetic materials or chemicals as the antimicrobial agents in food packaging has raised consumer concerns as well as environmental issues.
Natural plant extracts are a safe alternative to improve antimicrobial properties in food packaging such as PE or PP films instead of using synthetic chemicals. The incorporation of these natural antimicrobial agents into polymer-based packaging comes with certain challenges related to the active molecules’ sensitivity to temperature, dioxygen, light, and pH, their volatility, chemical instability and their dispersion in the high viscosity polymer matrix. An approach to overcome such challenges is the use of encapsulation, and in this context one of the most promising approaches is the formulation of antimicrobials containing micro/nanoemulsions. This encapsulation will preserve and enhance the functional properties of these antimicrobial agents prior to their incorporation into the polymeric packaging film.
The main objective of this work is to formulate antimicrobial micro/nanoemulsions and incorporate them into polymer matrices using melt processing technique to inhibit or retard the growth of microorganisms, thereby reducing food losses along the production and supply chains and increasing food safety and prolonging shelf-life. The influence of the presence of the antimicrobial agents on the thermal, microstructural, mechanical and barrier properties will be investigated.
The internship will take place in the Laboratoire Ingénierie des Matériaux Polymères, UMR5223 (IMP) and Laboratoire d’Automatique, de Génie des Procédés et de Génie Pharmaceutique, UMR 5007 (LAGEPP).
IMP is a joint research unit between the CNRS and Université de Lyon1. Its research activities range from the tailored synthesis of macromolecular architectures and polymer processing to the elaboration of complex materials and establishment of structure- properties relationships. The IMP gathers together complementary skills: synthesis, structural characterization and physico-chemical properties, in the fields of polymers and materials science.
LAGEPP is a joint research unit between the CNRS and Université de Lyon1. It’s a multidisciplinary laboratory covering the fields of process engineering, automation, product engineering, pharmaceutical engineering and physical chemistry. The LAGEPP is focusing on two main scientific themes: (i) Physicochemical processes in complex, dispersed and evolving media (nanoparticle production processes, crystallization, freeze-drying) and (ii) dynamic modeling, observation and control of processes.
Profile :
The candidate should have a good knowledge of the physico-chemistry of polymers and a strong interest in experiments and polymer characterization techniques. The candidate looks forward to working in a collaborative, multicultural, and open-minded team and must show enthusiasm, initiative and autonomy.
Application material : cover letter, CV in French or English
Application deadline : December 31th, 2023
Starting date :February 1st, 2024 (very earliest) to March 31th, 2024 (very latest)
Contract duration : 6 months
Salary : around 800 €/month
Please send your complete application material with subject “Master Position Application IMP-LAGEPP” to : Dr. Fabrice GOUANVE (fabrice.gouanve @ univ-lyon1.fr) and Dr. GHNIMI SAMI (sami.ghnimi @ univ-lyon1.fr).
Stage de Master 2 ou de 3ème année d’école d’ingénieur en collaboration avec Saint Gobain
Synthèse de résines phénoliques par extrusion réactive (PDF téléchargeable)
Contexte:
Saint-Gobain conçoit, fabrique et commercialise des matériaux de haute performance pour des applications techniques dans le bâtiment et les marchés de l’industrie. Nombre de ces matériaux contient des résines organiques, présentes en faibles quantités mais essentielles pour assurer la fonctionnalité finale des produits ainsi que leur bonne tenue thermomécanique. Maitriser la composition de ces résines est primordial afin de pouvoir s’adapter aux besoins du marché en termes de performances mais également en termes de durabilité et de respect des normes environnementales.
Objectifs du stage:
Le projet ambitionne de proposer une alternative aux résines phénoliques issues de réactions d’addition et de polycondensation d’un phénol et d’un aldéhyde (Formaldéhyde) en tirant profit de dérivés de la lignine. Des voies alternatives de synthèse de résines phénoliques biosourcées existent mais elle restent basées sur
des méthodes de synthèse en solution et/ou procédé batch. Le caractère innovant de ce sujet de recherche est la potentialité de réaliser ces synthèses sans solvant en contrôlant la structure d’oligomères obtenus par extrusion réactive. L’objectif du stage est donc de valoriser des dérivés de la lignine, obtenus en collaboration avec l'IRCELYON, dans la synthèse de résines phénoliques par un procédé continu et sans solvant en explorant les propriétés thermomécaniques associées. Ce stage se déroulera au sein du laboratoire IMP qui possède l’équipement nécessaire et sera suivi par une équipe de Saint-Gobain Recherche. Des déplacements sur le
site de R&D de Saint-Gobain à Aubervilliers seront prévus. Les principales missions sont :
• Effectuer une recherche bibliographique sur la chimie d’intérêt.
• Réaliser une étude cinétique et de caractérisations des structures obtenues (DSC, RMN, FTIR, SEC etc.)lors des synthèses.
• Qualifier les propriétés thermomécaniques des résines,
• Analyser et restituer les résultats sous forme de rapports et de présentations orales.
Profil :
Stage de Master 2 ou de 3ème année d’école d’ingénieur avec des connaissances en chimie organique et des polymères. Esprit d’initiative, créativité et capacité d’écoute seront nécessaires pour réussir dans cette mission.
Candidatures:
veronique.bounor-legare @ univ-lyon1.fr
arnaud.soisson @ saint-gobain.com
Durée du stage : 6 mois
Lieu: Laboratoire Ingénierie des Matériaux Polymères (IMP), 15 Boulevard André Latarjet, 69622 Villeurbanne
