3. Results and discussion
3.1. Crystalline morphology
The results of the spherulite size Dn. and the crystallinity Xc. with different quantities of nucleating agents, according to polar microscopy, are shown in Fig. 1. With an increasing filled quantity of nucleating agent, Dn decreased and progressively tended towards stabilization, whilst the crystallinity still increased and the rise gradient also went up. The crystal boundary became more and more ambiguous, and the irregular degree of crystal grain increased.