To further investigate the interaction between lignin and PLA
phases, FTIR was applied to demonstrate the structure difference
among lignin, PLA and their blends. As shown in Fig. 3(a), FTIR
spectra of lignin and Lignin/PLA blends show a strong O-H
stretching absorption around 3494 cm1 and a prominent C-H
stretching absorption around 2938 cm1 and 2840 cm1. The lignin
characteristic peaks appeared at 1608 and 1516 cm1, assigned to
the vibration of aromatic skeleton. The appearance of bands around
1322 and 1212 cm1 represents the C-O stretching of S ring and G