TorPropel Update: CIDETEC efforts on vitrimer polymers for aviation

In recent years, new polymer chemistries based on dynamic covalent bonds have emerged, combining the main advantages of current thermoset resins (thermo-mechanical and chemical resistance) and thermoplastic resins (recyclability and reprocessability). The chemical strategy of these new materials, called vitrimers, is based on introducing plasticity into the cross-linked polymer network through exchangeable chemical bonds, since the exchange reactions can be activated on demand by the application of an external stimulus such as heat, while always maintaining the three-dimensional network. In the activated state, the vitrimer can change shape or react with specific reducing agents, becoming reprocessable, repairable, and recyclable. The TORPROPEL project will produce a toroidal propeller using carbon fiber tapes pre-impregnated with an epoxy-based vitrimer specifically formulated for this application. This means that the propeller will not only be more efficient than conventional metal or composite ones thanks to its toroidal shape, but will also be more sustainable, as it can be repaired if damaged in service and recycled at the end of its useful life.