FTIR- Project1

4.3. Fourier transformation infrared spectroscopy (FTIR)

FTIR spectra of PBAT biopolymer is depicted in figure 3.

Figure 3: FTIR analysis for PBAT and its Bio-nanocomposite; (a). MA-g-PBAT-C20A, (b). MA-g-PBAT-C30B, (c). MA-g-PBAT-B109

It is evident that the peaks around 3000 cm^-1 represent C-H stretching corresponding to aliphatic and aromatic portion. The carbonyl groups (>C=O) in ester linkage presented a strong peak around 1710 cm^-1 with a sharp peak representing four or more adjacent –CH₂- groups at 720 cm^-1. The C-O bond in the ester linkage was observed around 1267 cm^-1. Bending peaks of benzene substitute were located at 700 cm^-1 and 900 cm^-1 respectively. The bio-nanocomposite hybrids exhibited similar stretching peaks of PBAT backbone.

In case of MA-g-PBAT/C30B nanocomposites hybrid, spectral band corresponding to 1727 cm¹ is probably due >C=O stretching whereas the band at 2995 cm^-1 represents the carboxylic-OH stretching. This confirms the formation of carboxylic group due to chemical reaction between PBAT, MA and C30B in presence of a free radical initiator, (BPO).

Similar stretching peaks corresponding to formation of carboxylic group was also observed in MA-g-PBAT/B109 and MA-g-PBAT/C20A at 2997 cm^-1 and 2990 cm^-1 respectively.