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

De-Qian Peng; Xin-Wen Yan; Shao-Wen Zhang; Xiao-Fang Li

doi:10.1007/s10118-018-2060-8

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

Articles | Updated：2021-02-18

- Syndiotactic Polymerization of Styrene and Copolymerization with Ethylene Catalyzed by Chiral Half-sandwich Rare-earth Metal Dialkyl Complexes
- Chinese Journal of Polymer Science Vol. 36, Issue 2, Pages: 222-230(2018)
- Affiliations：
  
  Key Laboratory of Cluster Science of Ministry of Education, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China
- Author bio：
  
  Shao-Wen Zhang, E-mail swzhang@bit.edu.cn
  Xiao-Fang Li, E-mail xfli@bit.edu.cn
- Funds：
- DOI：10.1007/s10118-018-2060-8
  CLC：
- Received：17 September 2017，
  
  Accepted：07 October 2017，
  
  Online First：30 November 2017，
  
  Published：05 February 2018
- Accepted：
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De-Qian Peng, Xin-Wen Yan, Shao-Wen Zhang, et al. 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：

De-Qian Peng, Xin-Wen Yan, Shao-Wen Zhang, et al. 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.

摘要

Abstract

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

) as the catalysts. The complexes are Ln(CH

SiMe

)

(THF) (

1-4

:Ln=Sc (

)

Ln=Lu (

)

Ln=Y (

)

Ln=Dy (

)) bearing chiral cyclopentadienyl ligand containing bulky cylcohexane derivatives in the presence of activator and Al

. For the St polymerization

a high activity up to 3.1×10

g of polymer molLn

-1

·h

-1

and a high syndiotactic selectivity more than 99% were achieved. The resulting syndiotactic polystyrenes (

PSs) have the molecular weights (

) ranging from 3700 g·mol

-1

to 6400 g·mol

-1

and the molecular weight distributions (

) from 1.40 to 5.03. As for the copolymerization of St and E

the activity was up to 2.4×10

g of copolymer mol

-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.

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Keywords

references

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