Synthesis of High Molecular Weight Polyethylene and E-MA Copolymers Using Iminopyridine Ni(II) and Pd(II) Complexes Containing a Flexible Backbone and Rigid Axial Substituents

Yu-Dan Liao; Qi Cai; Sheng-Yu Dai

doi:10.1007/s10118-022-2847-5

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Synthesis of High Molecular Weight Polyethylene and E-MA Copolymers Using Iminopyridine Ni(II) and Pd(II) Complexes Containing a Flexible Backbone and Rigid Axial Substituents

RESEARCH ARTICLE | Updated：2023-01-06

- Synthesis of High Molecular Weight Polyethylene and E-MA Copolymers Using Iminopyridine Ni(II) and Pd(II) Complexes Containing a Flexible Backbone and Rigid Axial Substituents
- Chinese Journal of Polymer Science Vol. 41, Issue 2, Pages: 233-239(2023)
- Affiliations：
  
  a.School of Chemical and Environmental Engineering, Anhui Polytechnic University, Wuhu 241000, China
  b.Institutes of Physical Science and Information Technology, Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education, Anhui University, Hefei 230601, China
- Author bio：
  
  daiyu@ustc.edu.cn
- Funds：
- DOI：10.1007/s10118-022-2847-5
  CLC：
- Received：05 June 2022，
  
  Revised：2022-7-17，
  
  Accepted：18 July 2022，
  
  Online First：10 October 2022，
  
  Published：01 February 2023
- Accepted：
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Liao, Y. D.; Cai, Q.; Dai, S. Y. Synthesis of high molecular weight polyethylene and E-MA copolymers using iminopyridine Ni(II) and Pd(II) complexes containing a flexible backbone and rigid axial substituents. Chinese J. Polym. Sci. 2023, 41, 233–239

Yu-Dan Liao, Qi Cai, Sheng-Yu Dai. Synthesis of High Molecular Weight Polyethylene and E-MA Copolymers Using Iminopyridine Ni(II) and Pd(II) Complexes Containing a Flexible Backbone and Rigid Axial Substituents[J]. Chinese Journal of Polymer Science, 2023, 41(2): 233-239.
Liao, Y. D.; Cai, Q.; Dai, S. Y. Synthesis of high molecular weight polyethylene and E-MA copolymers using iminopyridine Ni(II) and Pd(II) complexes containing a flexible backbone and rigid axial substituents. Chinese J. Polym. Sci. 2023, 41, 233–239 DOI： 10.1007/s10118-022-2847-5.

Yu-Dan Liao, Qi Cai, Sheng-Yu Dai. Synthesis of High Molecular Weight Polyethylene and E-MA Copolymers Using Iminopyridine Ni(II) and Pd(II) Complexes Containing a Flexible Backbone and Rigid Axial Substituents[J]. Chinese Journal of Polymer Science, 2023, 41(2): 233-239. DOI： 10.1007/s10118-022-2847-5.

摘要

Compared with the dibenzhydryl Ni(II) and Pd(II) catalysts

the catalysts using "sandwich" and rotation-restricted strategies exhibited an outstanding ability to suppress the chain transfer reactions and generated polymers and copolymers with 1-2 orders of magnitude higher molecular weights

Abstract

Suppressing the chain transfer reactions during polymerization in late-transition metal-catalyzed olefin polymerization systems is the key to obtaining high molecular weight polyolefin materials. In this work

two efficient strategies (“sandwich” and rotation-restricted strategies) to retard chain transfer reactions in ethylene (co)polymerization were employed for the iminopyridyl system. Herein

a family of iminopyridyl Ni(II) and Pd(II) complexes with a flexible backbone and rigid axial bulky aryl substituents were designed

synthesized and characterized. In ethylene polymerization

the iminopyridyl Ni(II) and Pd(II) catalysts using the two strategies exhibited reasonable activities and generated highly branched polyethylenes with high molecular weights

where catalysts with dibenzosuberyl substituents exhibited significantly higher activities and produced higher molecular weight polyethylene than catalysts with 8-arylnaphthalenyl substituent. A similar trend of activities and molecular weights was also found in the copolymerization of ethylene with MA using the Pd(II) catalysts. Moreover

highly branched E-MA copolymers with moderate to high molecular weights and high incorporation ratios (up to 17.4 mol%) were generated with the two Pd(II) catalysts. Most interestingly

as compared with the dibenzhydryl Ni(II) and Pd(II) catalysts

the catalysts using the two strategies exhibited a superior ability to retard the chain transfer reactions and generated polymers and copolymers with 1−2 orders of magnitude higher molecular weights during ethylene (co)polymerization.

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references

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