
8: POLY(ARYLENE ETHER NITRILE)S 217
carbon nanotubes can be improved by pendant car-
boxyl groups. The carboxyl groups on the side chain
of PEN react with the hydroxyl groups of the carbon
nanotubes. The dispersion ofthe carbon nanotubes can
be enhanced by the carboxyl groups on the PEN. The
PEN/carbon nanotubes hybrid films are good dielec-
tric materials.
8.4.5.3 Fullerene Nanocomposites
PEN/fullerene nanocomposites have been prepared
by solution casting [53]. PEN/fullerene nanocompos-
ites show increased mechanical properties in compar-
ison to neat PEN.
The dispersion of the fullerene bundles worsens
at amounts above 1.50%. These nanocomposites can
be