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1,2- and 3,4-rich polyisoprene synthesized by Mo(VI)-based catalyst with phosphorus ligand

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Abstract

Polyisoprene with relatively high content of 1,2/3,4 structure was synthesized using a novel catalyst system composed of MoO2Cl2 supported by phosphorus ligand and Al(OPhCH3)(i-Bu)2 as co-catalyst. The effects of phosphites, phosphates and phosphoric acid as ligands were investigated in the coordination polymerization of isoprene in the chosen catalyst system. The studied ligands significantly affected the catalytic activity of the Mo–Al catalytic active center without significant effect on the stereoselectivity. Mo(VI)-based catalyst system was proved to be highly effective in the polymerization of isoprene even at low [Al]/[Mo] ratio (10), affording polyisoprene with 1,2- and 3,4-% structural units in the range of 44.6–52.5%, high molecular weights M n ~ 105, and relatively broad molecular weight distributions (M w/M n = 3.0–4.4). The effect of molar ratio of phosphorous ligand to Mo-catalyst on catalyst activity of isoprene polymerization was discussed, and the structures of Mo–phosphite complexes were preliminarily studied by IR.

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Authors and Affiliations

  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, 266042, China

    Jieting Geng, Yanjie Sun & Jing Hua

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  1. Jieting Geng
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  2. Yanjie Sun
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  3. Jing Hua
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Correspondence to Jing Hua.

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Geng, J., Sun, Y. & Hua, J. 1,2- and 3,4-rich polyisoprene synthesized by Mo(VI)-based catalyst with phosphorus ligand. Polym. Sci. Ser. B 58, 495–502 (2016). https://doi.org/10.1134/S1560090416050043

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  • DOI: https://doi.org/10.1134/S1560090416050043

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