Résumé
This article emphasizes the phenomena occurring in furan resins at high temperature, once they are polymerized and before their carbonization. The effects of the atmosphere (N-2 and air) during the curing of furan resins were investigated and it is shown that upon exposure to air at temperatures above 175 degrees C, the furan resins develop an aromatic surface. By means of solid-state NMR and infrared spectroscopy, it is demonstrated that the aromatic groups are mainly located on the material's surface. A mechanism of this surface modification is proposed together with a short kinetic study. In addition, the thermo-mechanical properties are studied. The aromatic surfaces decrease the damping capacity of the material, yet its resistance to degradation is increased. Finally, tensile properties of the furan resins are not affected by the presence of this aromatic surface.