2.4.4. Fourier transform infrared analysis
Fourier transform infrared (FT-IR) spectra of the samples were
recorded in attenuated total reflectance (ATR) mode using a Bruker
Tensor 27 FT-IR spectrometer (Bruker, Germany). The spectra were
recorded at a wavenumber range from 500 cm−1 to 4000 cm−1 at
temperatures varying from 30 ◦C to 220 ◦C, using 32 accumulated
scans and a spectral resolution of 4 cm−1.