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Characterization of the effects of the C/N mixed external donors on the stereo-defects distribution of polypropylene by successive self-nucleating and annealing and 13C-NMR techniques

Journal of Polymer Research volume 20, Article number: 207 (2013) Cite this article

Abstract

As the external donor in Ziegler-Natta catalysts have an important influence on the stereo-defects distribution of polypropylene, the effects of the mixed external donors (the mixture of Donor-C (cyclohexylmethyldimethoxysilane) and Donor-N (n-propyltriethoxysilane) ) on the isotactic sequence length and its distribution of polypropylene prepared by Ziegler-Natta catalyst through propylene bulk polymerization were studied through the Successive self-nucleating and annealing (SSA) and 13C-NMR techniques. The SSA results showed that the relative contents of the highest isotactic component and the lamellar thickness in the polypropylene chain gradually increased with the increase of the relative component of Donor-C in the C/N mixed external donors, indicating the isotactic sequence length of polypropylene got longer, and the lamellar thickness distribution of polypropylene became broader, revealing the isotactic sequence length distribution of polypropylene got broader. In addition, the 13C-NMR results showed that the average meso isotactic sequence length (MSL) of polypropylene gradually increased with the increase of the content of Donor-C in the C/N mixed external donors, which was in good coincident with the results calculated from SSA, showing a good correspondence between the SSA and 13C-NMR techniques.

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Acknowledgments

The authors express thanks for the supports of the National Science Foundation of China (No. 51073170).

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, University of Chinese Academy of Sciences, Beijing, 100049, China

    Hefei Chang, Tao Zheng & Liaoyun Zhang

  2. Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Engineering Plastics, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China

    Huayi Li & Youliang Hu

  3. Shenhua Ningxia Coal Industry Group, Coal Chemical Industry Co., Ltd., Yinchuan, 750002, China

    Wei Yuan, Lei Li & He Huang

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  1. Hefei Chang
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  2. Huayi Li
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Correspondence to Huayi Li or Liaoyun Zhang.

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Chang, H., Li, H., Zheng, T. et al. Characterization of the effects of the C/N mixed external donors on the stereo-defects distribution of polypropylene by successive self-nucleating and annealing and 13C-NMR techniques. J Polym Res 20, 207 (2013). https://doi.org/10.1007/s10965-013-0207-4

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