Abstract
The crystals of N, N′-dicyclohexyl-2,6-naphthalenedicarboxamide (DC26NDCA) and N,N′-dicyclohexyl-1,4-naphthalenedicarboxamide (DC14NDCA) were selected as nucleating agents to induce the crystallization of isotactic polypropylene (i-PP). The influence of the crystal structures of the nucleating agents on the crystallization behaviors and morphologies was studied by means of differential scanning calorimeter, wide-angle X-ray diffraction, polarized light microscopy, and atomic force microscopy (AFM). The results show that DC26NDCA is a selective β-nucleating agent for the i-PP crystallization, while DC14NDCA only has a very weak α-nucleating effect for the i-PP crystallization. The dynamic growth processes reveal that i-PP crystals grow with different crystallization behaviors in the presence of the nucleating agents. The i-PP lamellar structures on the crystal surfaces of the nucleating agents were observed by AFM in details, which suggested that the nucleating agents induced the epitaxial growth of the i-PP lamellae.
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We are grateful for the support of the Outstanding Youth Found and National Science Foundation of China (Grant nos. 20574083, 20325414, and 50521302).
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Hou, WM., Liu, G., Zhou, JJ. et al. The influence of crystal structures of nucleating agents on the crystallization behaviors of isotactic polypropylene. Colloid Polym Sci 285, 11–17 (2006). https://doi.org/10.1007/s00396-006-1475-x
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DOI: https://doi.org/10.1007/s00396-006-1475-x