Raman spectroscopic investigation of tannin-furanic rigid foams

The aim of the present study is the Raman spectroscopic characterization of the tannin-furanic rigid foams in order to establish a tool complementary to infrared spectroscopy for comparing their spectral signature with that of the precursor materials furfuryl alcohol, polymerized furfuryl alcohol, and Mimosa tannin. The discussion deals with similarities and differences to the spectral signatures of sp2 carbon-based materials, the still preserved organic nature of the tannin-furanic foam, and with similarities and differences to recently reported infrared spectra.