are almost identical, and it is clear that the sample with 1.8 wt
% nanotubes has a more pronounced tail at longer times than
the sample with 0.6 wt % nanotubes. The results from
nonisothermal crystallization experiments indicate that the split
between the two polymorphs was less equal in the sample with
0.6 wt % nanotubes versus the other two polymorphs, and
perhaps the differences in Avrami exponent are simply a result
of this fact. A recent paper appeared in which a two-step
crystallization was hypothesized and the isothermal crystallization
data were fit with two separate symmetric peaks; the shape
of the curve for the sample with 1.8 wt % nanotubes in Figure
9 and the curve for PP (not shown) certainly suggest that such
a procedure would be justified. However, in the current case
the purpose of this exercise was not clear and hence was not
attempted.