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Highly stereospecific polymerization of isoprene with homogeneous binary Ziegler-Natta catalysts based on NCN-pincer neodymium precursor

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  • Special Topic Advances in Principles of Polymerization
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Abstract

The aryldiimine NCN-pincer stabilized neodymium dichloride combined with aluminum alkyls established a new type of homogeneous binary neutral Ziegler-Natta catalyst system. This system exhibited high activity and high cis-1,4 selectivity for the polymerization of isoprene (T p = 20 °C, 98.2%; T p = −20 °C, > 99%). Such catalytic performances remained under a broad range of polymerization temperatures and monomer-to-neodymium ratios (from 500 to 8000), reaching high number-average molecular weight (M n = 1582 kg/mol) and relatively narrow molecular weight distribution (PDI = 1.68), which was, however, influenced by the amount and bulkiness of aluminum alkyls. Dynamic investigation of the polymerization was performed, which showed the number-average molecular weight of the resultant polyisoprene had an almost linear correlation with the conversion, suggesting, in some degree, the polymerization with this catalytic system was controllable.

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Authors and Affiliations

  1. State Key Laboratory of Polymer Physics and Chemistry; Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China

    DongTao Liu & DongMei Cui

  2. Graduate University of Chinese Academy of Sciences, Beijing, 100039, China

    DongTao Liu

  3. School of Chemistry, Jilin University, Changchun, 130012, China

    Wei Gao

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  1. DongTao Liu
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  2. DongMei Cui
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Correspondence to DongMei Cui.

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Liu, D., Cui, D. & Gao, W. Highly stereospecific polymerization of isoprene with homogeneous binary Ziegler-Natta catalysts based on NCN-pincer neodymium precursor. Sci. China Chem. 53, 1641–1645 (2010). https://doi.org/10.1007/s11426-010-4041-9

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  • DOI: https://doi.org/10.1007/s11426-010-4041-9

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