12/06/2020

PhD position - Modulation of the network connectivity in vitrimers

This job offer has expired


  • ORGANISATION/COMPANY
    ESPCI Paris/CNRS
  • RESEARCH FIELD
    ChemistryOrganic chemistry
  • RESEARCHER PROFILE
    First Stage Researcher (R1)
  • APPLICATION DEADLINE
    31/08/2020 12:00 - Europe/Brussels
  • LOCATION
    France › Paris
  • TYPE OF CONTRACT
    Temporary
  • JOB STATUS
    Full-time
  • HOURS PER WEEK
    35
  • OFFER STARTING DATE
    02/11/2020

OFFER DESCRIPTION

Supervisors: 

Nathan Van Zee (nathan.van-zee@espci.psl.eu)

Renaud Nicolaÿ (renaud.nicolay@espci.psl.eu)

 

Funding source: 

Performance Polymers Program, Dutch Polymer Institute (https://www.polymers.nl)

 

Start date: 

November-December 2020

 

To apply:

Candidiates should send their CV and the contact information of two references to nathan.van-zee@espci.psl.eu and renaud.nicolay@espci.psl.eu

 

Description of the laboratory:

The Laboratory of Chimie Moléculaire, Macromoléculaire, et Matériaux (C3M) is a CNRS mixed research unit at the ESPCI Paris – PSL, a grande école internationally recognized for its scientific excellence in training and research. The C3M laboratory works in close collaboration with industry partners on research topics linked to the development of new fundamental concepts and applications. Its main areas of research are: the design and study of structured polymeric and hybrid materials; the design and study of stimuli-responsive functional systems; supramolecular chemistry; as well as the dynamic and mechanical study of polymeric-colloid formulations and composites.

 

Project description:

Vitrimers are permanent networks of polymer chains that are crosslinked with dynamic covalent bonds that enable the network to change its topology while maintaining a constant average crosslinking density across all temperatures. The dynamic crosslinks are characterized by reversibility and fast exchange kinetics, which together allow vitrimers to flow like an amorphous glass at elevated temperatures. Vitrimers are consequently capable of fully relaxing stress. In addition, the exchanges between dynamic crosslinks can take place at the interface between polymer matrices of similar and different chemical natures. These features make vitrimers a promising next-generation material for recycling and upcycling applications. However, the constant, temperature-independent network connectivity of vitrimers represents a formidable processing challenge. Vitrimers with high crosslinking densities typically exhibit high viscosities, which precludes injection molding. Furthermore, in the welding of vitrimer components, there is an inherent trade-off between weld reversibility and strength. In this project, we will explore a new approach to enable crosslinked materials to truly behave as thermoplastics at processing temperatures. The project will be highly interdisciplinary, as it will encompass organic synthesis, polymer functionalization, physical chemistry, and materials science. We will elucidate principles generated in this project through creative application of X-ray scattering, microscopy, spectroscopy, rheology, calorimetry, and mechanical testing techniques.

 

Keywords:

Polymer functionalization, dynamic covalent chemistry, polymer nucleation, crystallization, physical chemistry, rheology, microscopy, calorimetry, X-ray scattering

 

More Information

Offer Requirements

  • REQUIRED EDUCATION LEVEL
    Chemistry: Master Degree or equivalent
  • REQUIRED LANGUAGES
    ENGLISH: Good

Skills/Qualifications

The candidate should have a keen interest in polymer functionalization, molecular chemistry, and polymer characterization.

 

Work location(s)
1 position(s) available at
ESPCI Paris/CNRS
France
Paris
75005
10, rue Vauquelin

EURAXESS offer ID: 531908

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