Results of the variation of crystallinity with heat
treatment are shown in Figs. 2 and 3. Tables 2 and 3
report the influence of heat treatment on spherulite size. From the results, it can be seen that, with an
increase in temperature in the heat treatment, the
crystallinity increased; with an increase in the time of the heat treatment, the crystallinity also went up, and
tended towards stabilization. The process of heat treatment did not affect the spherulite size of the materials
Ž . see Tables 2 and 3 because it only increases the
integrity of the materials and the spherulithic growth
speed does not vary throughout the process.