The development of new synthesis methods is essential for designing a new generation of polymers that combine performance and durability while offering sustainable solutions that meet the requirements of the circular economy, i.e., being reusable and recyclable. Therefore, we must propose, through a “functional materials” approach, to develop molecular building blocks that allow the integration of the required functions in the initial synthesis stages. At the same time, scientists must consider the end of life of these functional materials through the concept of “design for degradation” or “design for recycling.” To meet these challenges, the NEXTGEN project proposes two main strategies: i) Designing unique ionic liquid (IL) architectures that will serve as platforms for the development of unique, sustainable, reusable, and (multi)functional networks dedicated to composite applications, and ii) developing chemical recycling methods using green solvents to promote the dissolution and/or depolymerization of thermoset-based composites.

In conclusion, rich libraries of reusable fiber-reinforced composites combining several functionalities will be implemented using conventional processing methods.