position of the purified cellulose fibers is related to the partial
removal of hemicellulose and lignin from the fibers, as well as
the higher crystallinity of cellulose (Alemdar & Sain, 2008). The
cellulose nanofibers obtained after ultrasonic treatments exhibited
a degradation behavior that is highly similar to that of the
purified cellulose fibers. The decomposition temperature of all cellulose
nanofibers under different ultrasonic output powers starting
at approximately 335 ◦C, implied that ultrasonic treatment had little
effect on the thermal decomposition of the cellulose nanofibers.
This result is also consistent with the findings obtained from the
XRD and FTIR analyses, indicating that the ultrasonic process did
not influence cellulose chemical composition, crystal structure, and
thermostability. Apparently, only structural changes occurred