It is well known that when the lignin is modified by acetylation
or other ester modification, hydroxyl groups were replaced
by ester substituent (Cachet et al., 2014). Thus, reduce the number
of hydrogen bonding and lead an increased free volume in
the molecule and thus, the mobility of the chains (Lispeguer et al.,
2009). The thermogravimetric (TG) curves obtained for KL and AKL
under nitrogen atmosphere are presented in