The surface of the NPCC filler is usually treated
with fatty acids such as stearic acid, to modify the
filler surface to become hydrophobic. The main
purpose for this surface coating is to reduce moisture
absorption and hence particle agglomeration
during storage, as well as to improve dispersibility
of the polar filler when incorporated into non-polar
polymer melts [13]. Improved dispersion of the
nanofillers within the polymer matrix is a prerequisite
for any improvement in mechanical properties,
particularly impact strength.