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International Journal of Polymer Science
Volume 2016, Article ID 9839201, 9 pages
Research Article

Effect of Different Nucleating Agents on the Crystallization of Ziegler-Natta Isotactic Polypropylene

1Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila (UAdeC), Boulevard V. Carranza and González-Lobo, 25000 Saltillo, COAH, Mexico
2Centro de Investigación en Química Aplicada (CIQA), Boulevard Enrique Reyna No. 140, 25294 Saltillo, COAH, Mexico

Received 26 January 2016; Revised 6 May 2016; Accepted 17 May 2016

Academic Editor: Marta Fernández-García

Copyright © 2016 Felipe Avalos-Belmontes et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Ziegler-Natta isotactic polypropylene (iPP) was melt mixed with four different nucleating agents (carbon nanotubes (CNT), carbon nanofibers (CNF), lithium benzoate (LiBe), and a sorbitol derivative (Millad)) in order to study their effect on the crystallization of iPP. It was found that the four different nucleating agents promote the alpha crystalline form. At 0.01 wt%, the carbon nanoparticles produced the higher crystallization temperature “” (~119°C), whereas, at 0.10 wt%, LiBe and Millad produced a markedly higher (~125°C). of pure iPP was 111°C. With 0.1 wt% nucleating agent, at 120°C, the crystallization half-life time of PP, when using LiBe or Millad, was 15 times faster than for pure PP, whereas, when using carbon nanoparticles, it was 20–25 times faster. At 135°C, with 0.01 wt% nucleating agent, the isothermal crystallization process of iPP was completed after 25 min, as well as with Millad. With LiBe, it was completed after just 15 min and, with any of the carbon nanoparticles, it was practically over after only a couple of minutes.