2.2.6. Fourier Transform Infrared Spectroscopy (FTIR)

FTIR analyses were performed using attenuated total reflectance (ATR) on the piassava powder samples, COPU resin and its biocomposites. The equipment used was a spectrophotometer model IR-Affinity-1 made by Shimadzu, with a range interval of 4000–400 cm−<sup>1</sup> and a resolution of 4 cm−<sup>1</sup> , 32 scans. The preparation consisted of mixing the materials with KBr in order to increase the absorption signal.
