The results of dynamic mechanical analysis
of the modified and unmodified PP/glass
fiber composites are shown in Figure 3. The
storage modulus of PP is found to improve
steadily with addition of short glass fiber.
The modulus shown by the modified PP/
glass fiber composite containing 30 wt.%
glass fiber is almost at par with the
unmodified composite containing 50 wt.%
of glass fiber. This further show that the
amount of glass fiber required for a particular
reinforcement can be substantially reduced
upon modification with
nanosilica. The high
temperature stability of the modified com-
posite is found to be superior to the 50 wt.%
glass fiber/PP composite. Another attrac-
tive feature of nanosilica modification is
that the value of loss factor is at a low leve