Catalytic behavior of Co(II) complexes with 2-(benzimidazolyl)-6-(1-(arylimino)ethyl)pyridine ligands on isoprene stereospecific polymerization

Authors

  • Geng Wang,

    1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, China
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  • Xiubo Jiang,

    1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, China
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  • Weizhen Zhao,

    1. Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
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  • Wen-Hua Sun,

    1. Key Laboratory of Engineering Plastics and Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
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  • Wei Yao,

    1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, China
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  • Aihua He

    Corresponding author
    1. Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao, China
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ABSTRACT

Polymerization behaviors of isoprene under different polymerization conditions with 2-(1-methyl-2-benzimidazolyl)-6-(1-(arylimino)ethyl) pyridine cobalt(II) dichloride and ethylaluminum sesquichloride or diethylaluminum chloride catalyst system were evaluated. The effects of temperature, solvents, [Al]/[Co] molar ratio, and the structure of cocatalysts on the catalyst activity and the characteristics of polyisoprenes (PIs) were investigated and optimum conditions for synthesizing stereoselective PIs were obtained. The results showed that pre-catalyst activity was strongly influenced by polymerization temperature, [Al]/[Co] molar ratio and solvents, and the kinds of solvents and cocatalysts affected the microstructures of PIs greatly. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 39703.

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