With the growing demand for eco-designed surface technologies, self-stratifying coatings emerge as a sustainable and efficient alternative to conventional multilayer systems. These systems, based on one-pot formulations of incompatible polymers, enable the spontaneous formation of functional multilayer architectures in a single application and curing step, reducing raw material use, energy consumption, and processing complexity [1]. These last years, we designed self-stratifying systems for different applications, such as flame retardancy [2], fouling resistance and aerospace [3]. They were mainly based on oil-based and bio-based epoxies [4] combined with different polymers such as polyurethane, silicone and PVDF. A comparative Life Cycle Assessment (LCA) revealed a significant reduction in environmental impact - up to 30% compared to traditional multilayer systems - due to the simplified processing and bio-based content [5].

Our research now focuses on self-stratifying coatings that incorporate dynamic covalent polymer networks, i.e. vitrimers. Two original self-stratifying coatings were designed, i.e. a bio-based vitrimer expoy/PVDF system [6] and a bio-based epoxy / vitrimer silicone system [7]. The first one demonstrates robust adhesion to metallic substrates, along with thermally triggered removability, allowing substrate recovery and potential material recyclability. The second shows excellent adhesion to plastics and self-repairing properties at room temperature.

This study paves the way for new generations of coatings combining sustainability, high performance, and smart functionalities, with promising applications in packaging, food processing, electronics, and aerospace sectors.