The aim of this project is the elaboration of a new biosourced polyamide-based UV powder coating for heat sensitive substrates. Indeed, polyamides are totally absent from this application field whereas they exhibit excellent mechanical properties and solvent resistance. This powder coating will be constituted of low melting point polyamides (< 120°C) made of monomers from vegetable oils. The low mechanical properties which will result from the low crystallinity of these polyamides will be compensated for an additional photocrosslinking step during its implementation. Therefore, polyamides will be elaborated from modified fatty acids coming from vegetable oils. Some original unsaturated monomers will be synthesized within this framework. They will potentially have a high impact in the polymer world. The powder composition and the coating elaboration conditions will be optimized by the mechanistic study of the photochemical reaction and the characterization of the physico-chemical properties of the ultimate materials. The team constituted within the framework of this project will associate young researchers who have expertises in polymer field (PBS, UMR CNRS 6270 – INSA of Rouen) and structural analysis of chemical compounds by mass spectrometry (COBRA, UMR CNRS 6014 – University of Rouen). This association will permit to precisely characterize the new synthesized monomers and polymers and to define the nature of the functional groups which will intervene in the photocrosslinking reaction and so, to determine the best composition of the powder coating.