Post-Doc - Rheology and processing of multi-Micro-/Nanolayered polymers based on TPE or elastomers

Description :
Description of the postdoctoral position :
Context : Currently, nanostructured multilayer films have attracted tremendous interest because of their unique properties from the multiscale assembly, spatial confinement and interfacial effects. The challenge of this field is to design such nanostructured materials with controlled architectures and properties. Such nanostructured materials with controlled architectures and performances can be obtained by an innovative processing based on co-extrusion. Based on the concept of layer multiplication, this technology renders it possible to control the layer architecture and thickness from the micro- to the nano-scale. Herein, the multi-nanolayer film maximizes interface/interphase contributions and/or confinement-induced phenomena. The obtained nanostructured multilayer polymer films demonstrate in general highly tunable mechanical, electrical/dielectric, optical, gas/water barrier, and shape memory properties, arising mainly from the layer-layer interface effect. During processing, some interfacial instabilities (viscous encapsulation or secondary flows) occur. Moreover, interfacial distortions, layer heterogeneities, nano-droplets or layer breakup can be generated. Under such conditions, the interfacial properties are far from being well understood to optimize the process and customize the target properties. In our recent works, a great effort has been dedicated to investigate the rheology, dynamics and processing of multi-micro/nanolayered polymers based on compatible or incompatible pairs. The keywords for this research are : structure-rheology-processing-property relationships.

Objectives : When confined in the form of micro/nano-layers, TPEs are able to adopt original behaviors depending of their nanostructuration. The present proposal deals with the Multi-scale Studies of Confined TPE polymers in micro/nanolayered Structures based on model polymers with tailored interface/interphases properties. The main goal is to master/tune controlled associations of TPEs and/or elastomers and then studies their rheological, morphological and tribological behavior in relation to the obtained structure. The nanostructured materials will be fabricated by coextrusion with the specific means of the IMP laboratory (Oyonnax). They will be the subject of mechanical and physicochemical characterizations at INSA in Lyon and at Michelin research center at Clermont-Ferrand. On the one hand, the materials used for this study are to be defined on the basis of a well-known TPEs and elastomers formulated at Michelin research Centre. The guideline is to identify the property offsets of these structures compared to traditional materials depending of the target applications.
On the other hand, the results will help to understand the fundamentals of the interfacial phenomena over different length scales. Some innovative interfacial rheological investigation will be developed. Hence, they will offer some new enlightenment for fundamental understanding of TPE layer confinement and the interphases development. Dual experiments and modelling will be performed for the high mismatched viscoelastic TPE materials. Overall, based on these finding, the outcome of the post-doctoral proposal should foster development of new nanostructured materials with tailored properties.
This study will be carried out as part of a collaboration between the Lab.” Ingénierie des Matériaux Polymères” and the Michelin Company. This 12-months project will take place mainly at Oyonnax (IMP). Host institutions and laboratories :
*UMR5 CNRS 2223 « Ingénierie des Matériaux Polymères », Pôle de compétences-Sterhéo : Structure et rhéologie des polymères – procédés et Modélisation.
*Manufacture Française des Pneumatiques Michelin, Centre d’Étude et de Recherche de Ladoux.

Profile of candidate and expected skills : researcher trained in polymeric materials, rheology and mechanical testing/properties. PhD or confirmed engineer should have an interdisciplinary profile either in polymer science, rheology and/or polymer processing, Tool design and modelling.
Responsibilities and expected outputs :

- To conduct and develop an individual research topic,

- Potential supervision of early stage researchers,

- Publication in journals with good impact factors,

- Presentation of the results at the company and during the internal lab meetings …

- Experience in topics related to the project - Must possess a PhD degree and/or a good research experience,

- Previous publication activity in journals with good impact factors (IF),

- Fluency in written and spoken English.

Cross salary : 2100 € neat/month including the French social insurance.
Duration : 12 months.
Deadline : (Urgent) The selection will start in September 2020. The project is scheduled to start on October 1st 2020.
To apply : The application must include : (i) the candidate’s detailed CV, (ii) letters of intent, (iii) a list of publications, (iv) copies of degrees. The successful applicant is expected to be an enthusiastic and self-motivated person with strong intellect who is able to take a creative approach to scientific tasks. The applicant should have the skills necessary to be an independent researcher in his respective areas of specialization. The ability to lead and a communicative personality are strong advantages

Contacts : Khalid LAMNAWAR (Professor Associate -HDR, IMP @INSA Lyon), Tel. 04 74 81 93 09 ou 06 73 80 56 98.
Abderrahim Maazouz (Professor, IMP @INSA Lyon), Tel. 04 72 43 63 32 ou 06 25 54 45 88.
Jean Coué (Groupe Michelin)

Websites :

Reference : Proposal research subject : 12-months (IMP-Michelin)

Date de démarrage : 01 octobre 2020

Durée : 12 months

Contacter :
IMP (Lyon & Oyonnax)/Michelin, Centre d’Étude et de Recherche de Ladoux
khalid Lamnawar
email :
Téléphone : 0673805698

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