1.When 5 wt.% of PLAwas added to lignin, the
C]O peak of PLA was shifted from 1756 to 1760 cm1 due to the
change in the surrounding environment. Besides, the C-O band of
lignin became unobvious compared with that of PLA in Lignin/PLA
blends. The amplified spectrum of C-O stretching region is
depicted in Fig. 3(b). The C-O band of Lignin/PLA blends
was shifted to a lower wavenumber with the increasing content
of PLA, from 1760 cm1 of Lignin/PLA 95/5 blend to 1757 cm1 of Lignin/PLA 80/20 blend. This phenomenon can be attributed to
the formation of hydrogen bonds between the eOH groups from
lignin chains and the C]O groups from PLA chains. Similar interaction
between poly(3-hydroxybutyrate-co-3-hydroxyvalerate)
(PHBV) and cellulose nanocrystals (CNCs) has been reported by Yu
et al.