Design and Engineering of Adaptable Covalent and Interpenetrating Polymer Networks for Recyclab[...]

Organisation/Company CY Cergy Paris Université Department chemistry Research Field Chemistry Researcher Profile First Stage Researcher (R1) Positions PhD Positions Application Deadline 1 May 2026 - 16:00 (Europe/Paris) Country France Type of Contract Temporary Job Status Full-time Hours Per Week 35 Offer Starting Date 1 Oct 2026 Is the job funded through the EU Research Framework Programme? Not funded by a EU programme Is the Job related to staff position within a Research Infrastructure? No

Offer Description

Context

Covalent Adaptable Networks (CANs) represent a major breakthrough in polymer science, combining the mechanical and/or thermal resistance of thermosets with the recyclability of thermoplastics thanks to dynamic bonds. An adaptable covalent network, also known as a vitrimer, is distinguished by its unique ability to reorganize its internal architecture without losing structural integrity. By using dynamic chemical bonds capable of exchanging under the influence of an external stimulus, this material offers unprecedented malleability to traditionally rigid cross‑linked polymers. This feature allows for the repair as well as the recycling of cross‑linked polymer materials. By merging the robustness of thermosets with the circularity of thermoplastics, CANs are emerging as a future‑proof solution for more sustainable plastics engineering.

However, a challenge remains: the complex trade‑off between rigidity, toughness, and processability. To overcome these hurdles, this project proposes exploring an innovative architecture: Interpenetrating Polymer Networks (IPN‑CANs). IPN architecture is the simplest method to improve material properties by decoupling mechanical characteristics through the physical entanglement of two distinct networks, as opposed to strategies involving the synthesis of new polymers or copolymers (usually block copolymers). The main drawback of IPNs is their non‑recyclability. The idea is therefore to equip them with vitrimer functions to grant them this property. The challenge lies in the fact that the morphology of IPN‑CANs, which partly determines the material’s properties, can evolve over time and thus modify its performance. Therefore, it will be necessary first to characterize this evolution, and secondly, to either block or accelerate it depending on the application—essentially performing true material design. The goal is to surpass the limits of the current state of the art, where the activation of dynamic bonds often leads to the fusion of networks into a single entity, by using orthogonal dynamic functions. The objective is to create multifunctional, self‑healing, and recyclable materials whose morphology evolves in a controlled manner after reprocessing.

PhD Objectives

The doctoral candidate will be responsible for developing new IPN‑CAN systems by mastering the design of vitrimers with adjustable dynamic covalent bonds, such as transesterification or disulfide and imine exchanges. The candidate will synthesize the IPNs using sequential or simultaneous polymerization approaches to precisely control the morphology and interpenetration of the networks. A major part of the work will involve establishing synthesis‑structure‑property‑function correlations by studying the influence of the IPN architecture on viscoelasticity, creep, and shaping/repairing capabilities. To achieve this, advanced characterization tools (rheology, DMA, AFM, SAXS) will be coupled with experimental and potentially computational approaches to demonstrate the recyclability and self‑healing of the materials. Finally, the project will explore the application potential of these multifunctional networks, particularly through their compatibility with additive manufacturing and their integration into innovative devices such as reprogrammable actuators or biomedical devices. Through its transverse approach, this topic offers a unique opportunity to navigate between synthetic chemistry, analytical physical chemistry, and materials engineering to address sustainability challenges.

This project offers the doctoral student the opportunity to work in a multidisciplinary framework within the materials field. It will strengthen their knowledge in chemistry, physical chemistry, and material design, as well as in chemical, physicochemical, and morphological characterization.

Where to apply

E-mail

Requirements

Research Field Chemistry Education Level Master Degree or equivalent

Skills/Qualifications

Candidate Profile

• Education: Holder of a Master 2 or an Engineering degree in Chemistry.
• Knowledge: Strong background in the physical chemistry of materials and practical experience in monomer or polymer synthesis.
• Technical Skills: Proficiency in spectroscopic characterization (UV-Vis, FTIR, Raman), rheological, and microscopic techniques (SEM-EDX, AFM).
• Soft Skills: Rigorous, strong synthesis skills, open‑minded, and real ease with written and oral communication.
• Languages: An excellent level of English is mandatory for scientific monitoring, writing international publications, and presenting work at conferences.