Polymerization Kinetics of Propylene with the MgCl<sub>2</sub>-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst

Wei-Ping Zheng; Ya-Ping Ma; Da-Lin Du; Ai-Hua He; Hua-Feng Shao; Chen-Guang Liu

doi:10.1007/s10118-020-2473-z

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Polymerization Kinetics of Propylene with the MgCl₂-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst

ARTICLE | Updated：2020-08-24

- Polymerization Kinetics of Propylene with the MgCl₂-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst
- Chinese Journal of Polymer Science Vol. 39, Issue 1, Pages: 70-80(2021)
- Affiliations：
  
  Shandong Provincial Key Laboratory of Olefin Catalysis and Polymerization, Key Laboratory of Rubber-Plastics (Ministry of Education), School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
- Author bio：
  
  ahhe@qust.edu.cn; aihuahe@iccas.ac.cn
- Funds：
- DOI：10.1007/s10118-020-2473-z
  CLC：
- Received：07 April 2020，
  
  Revised：2020-6-13，
  
  Accepted：23 June 2020，
  
  Online First：24 August 2020，
  
  Published：01 January 2021
- Accepted：
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Zheng, W. P.; Ma, Y. P.; Du, D. L.; He, A. H.; Shao, H. F.; Liu, C. G. Polymerization kinetics of propylene with the MgCl₂-supported Ziegler-Natta catalysts—active centers with different tacticity and fragmentation of the catalyst. Chinese J. Polym. Sci. 2021, 39, 70–80 DOI: 10.1007/s10118-020-2473-z.

Wei-Ping Zheng, Ya-Ping Ma, Da-Lin Du, et al. Polymerization Kinetics of Propylene with the MgCl₂-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst[J]. Chinese Journal of Polymer Science, 2021, 39(1): 70-80. DOI: 10.1007/s10118-020-2473-z.
Zheng, W. P.; Ma, Y. P.; Du, D. L.; He, A. H.; Shao, H. F.; Liu, C. G. Polymerization kinetics of propylene with the MgCl₂-supported Ziegler-Natta catalysts—active centers with different tacticity and fragmentation of the catalyst. Chinese J. Polym. Sci. 2021, 39, 70–80 DOI: 10.1007/s10118-020-2473-z. DOI：

Wei-Ping Zheng, Ya-Ping Ma, Da-Lin Du, et al. Polymerization Kinetics of Propylene with the MgCl₂-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst[J]. Chinese Journal of Polymer Science, 2021, 39(1): 70-80. DOI: 10.1007/s10118-020-2473-z. DOI：

摘要

Abstract

The catalytic activity and stereospecificity of olefin polymerization by using heterogeneous TiCl

/MgCl

Ziegler-Natta (Z-N) catalysts are determined by the structure and nature of active centers

which are mysterious and fairly controversial. In this work

the propylene polymerization kinetics under different polymerization temperatures by using Z-N catalysts were investigated through monitoring the concentration of active centers [C*] with different tacticity. SEM was applied to characterize the catalyst morphologies and growing polypropylene (PP) particles. The lamellar thickness and crystallizability of PP obtained under different polymerization conditions were analyzed by DSC and SAXS. The PP fractions and active centers with different tacticity were obtained with solvent extraction fractionation method. The catalytic activity

active centers with different tacticity and propagation rate constant

fragmentation of the catalyst

crystalline structure of PP are correlated with temperature and time for propylene polymerizations. The polymerization temperature and time show complex influences on the propylene polymerization. The higher polymerization temperature (60 °C) resulted higher activity

and lower [C*]

and the isotactic active centers C

* as the majority ones producing the highest isotactic polypropylene (

PP) components showed much higher

when compared with the active centers with lower stereoselectivity. Appropriate polymerization time provided full fragmentation of the catalyst and minimum diffusion limitation. This work aims to elucidate the formation and evolution of active centers with different tacticity under different polymerization temperature and time and its relations with the fragmentation of the PP/catalyst particles

and provide the solutions to the improvement of catalyst activity and isotacticity of PP.

关键词

Keywords

references

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Polymerization Kinetics of Propylene with the MgCl2-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst

DOI：10.1007/s10118-020-2473-z

摘要

Abstract

关键词

Keywords

references

Polymerization Kinetics of Propylene with the MgCl₂-Supported Ziegler-Natta Catalysts—Active Centers with Different Tacticity and Fragmentation of the Catalyst