conducted to investigate the crystalline behavior of the fibers. The
XRD graph (Fig. 7) evidently shows that all diffractograms exhibited
sharp peaks around 2 =16◦ and 22.6◦, which were believed
to represent typical cellulose I form. This indicates that the crystal
structure of cellulose was not changed during the chemical and
ultrasonic treatment. The crystallinity of each sample is also calculated
and listed in Fig. 7. A significant increase in crystallinity
from 52.74% for the original wood fibers to 69.34% for the chemical-