Citation: De-Qian Peng, Xin-Wen Yan, Shao-Wen Zhang, Xiao-Fang Li. Syndiotactic Polymerization of Styrene and Copolymerization with Ethylene Catalyzed by Chiral Half-sandwich Rare-earth Metal Dialkyl Complexes[J]. Chinese Journal of Polymer Science, ;2018, 36(2): 222-230. doi: 10.1007/s10118-018-2060-8 shu

Syndiotactic Polymerization of Styrene and Copolymerization with Ethylene Catalyzed by Chiral Half-sandwich Rare-earth Metal Dialkyl Complexes

Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China

Corresponding author: Shao-Wen Zhang, swzhang@bit.edu.cn Xiao-Fang Li, xfli@bit.edu.cn

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Received Date: 17 September 2017
Accepted Date: 7 October 2017
Available Online: 30 November 2017

The syndiotactic polymerization of styrene (St) and the copolymerization of St with ethylene (E) were carried out by using a series of chiral half-sandwich rare-earth metal dialkyl complexes (Cp^{x^*}) as the catalysts. The complexes are Ln(CH₂SiMe₃)₂(THF) (1-4:Ln=Sc (1), Ln=Lu (2), Ln=Y (3), Ln=Dy (4)) bearing chiral cyclopentadienyl ligand containing bulky cylcohexane derivatives in the presence of activator and AlⁱBu₃. For the St polymerization, a high activity up to 3.1×10⁶ g of polymer molLn^-1·h^-1 and a high syndiotactic selectivity more than 99% were achieved. The resulting syndiotactic polystyrenes (sPSs) have the molecular weights (M_n) ranging from 3700 g·mol^-1 to 6400 g·mol^-1 and the molecular weight distributions (M_w/M_n) from 1.40 to 5.03. As for the copolymerization of St and E, the activity was up to 2.4×10⁶ g of copolymer mol_Sc^-1·h^-1·MPa^-1, giving random St-E copolymers containing syndiotactic polystyrene sequences with different St content in the range of 15 mol%-58 mol%. These results demonstrate that the bulky cyclopentadienyl ligands of the chiral half-sandwich rare-earth metal complexes effectively inhibit the continued insertion of St monomers into the (co)polymer chain to some extent in comparison with the known half-sandwich rare-earth metal complexes.
- Half-sandwich,
- Rare-earth metal complex,
- Syndiotacti cpolymerization,
- Copolymerization,
- Styrene,
- Ethylene
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