Ni(acac)<sub>2</sub> Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes

Liang Fang; Chun-Yu Zhang; Xue-Quan Zhang; Xian-De Shen; Heng Liu; Toyoji Kakuchi

doi:10.1007/s10118-022-2855-5

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Ni(acac)₂ Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes

RESEARCH ARTICLE | Updated：2023-01-18

- Ni(acac)₂ Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes
- Chinese Journal of Polymer Science Vol. 41, Issue 3, Pages: 356-364(2023)
- Affiliations：
  
  a.Research Center for Polymer Materials, School of Materials Science and Engineering, Changchun University of Science and Technology, Changchun 130022, China
  b.Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, Qingdao University of Science & Technology, Qingdao 266061, China
  c.Division of Applied Chemistry, Faculty of Engineering, Hokkaido University, Sapporo, Hokkaido 060-8628, Japan
- Author bio：
  
  shenxiande@cust.edu.cn (X.D.S.)
  hengliu@qust.edu.cn (H.L.)
  kakuchi@eng.hokudai.ac.jp (T.K.)
- Funds：
- DOI：10.1007/s10118-022-2855-5
  CLC：
- Received：01 June 2022，
  
  Revised：2022-8-7，
  
  Accepted：24 August 2022，
  
  Online First：10 October 2022，
  
  Published：01 March 2023
- Accepted：
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Fang, L.; Zhang, C. Y.; Zhang, X. Q.; Shen, X. D.; Liu, H.; Kakuchi, T. Ni(acac)₂ mediated vinyl polymerization of norbornene in the presence of bulky salicylaldiminate ligands: an effective strategy to access soluble polynorbornenes. Chinese J. Polym. Sci. 2023, 41, 356–364 DOI: 10.1007/s10118-022-2855-5.

Liang Fang, Chun-Yu Zhang, Xue-Quan Zhang, et al. Ni(acac)₂ Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes[J]. Chinese Journal of Polymer Science, 2023, 41(3): 356-364. DOI: 10.1007/s10118-022-2855-5.
Fang, L.; Zhang, C. Y.; Zhang, X. Q.; Shen, X. D.; Liu, H.; Kakuchi, T. Ni(acac)₂ mediated vinyl polymerization of norbornene in the presence of bulky salicylaldiminate ligands: an effective strategy to access soluble polynorbornenes. Chinese J. Polym. Sci. 2023, 41, 356–364 DOI: 10.1007/s10118-022-2855-5. DOI：

Liang Fang, Chun-Yu Zhang, Xue-Quan Zhang, et al. Ni(acac)₂ Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes[J]. Chinese Journal of Polymer Science, 2023, 41(3): 356-364. DOI: 10.1007/s10118-022-2855-5. DOI：

摘要

The present research sheds light on future ligand designing for late-transition metal promoted NB polymerizations if soluble PNB products. The linear mainchain structure as well as the decreased stereoselectivities of PNB

due to the incorporation of salicylaldiminate ligands to the active species

contributed most to the well-improved solubilities.

Abstract

Late transition metals have long served as workhorses for vinyl polymerization of norbornene derivatives. Nevertheless

for such catalytic systems

insoluble polynorbornene (PNB) products are often produced which hampers their further detailed characterizations

such as molecular weights

polydispersities

stereoregularities

etc

. In this work

we surprisingly found that for a traditional Ni(acac)

/MAO system that was previously reported to give insoluble PNBs

incorporation of highly bulk salicylaldiminate ligands could significantly improve the solubility of the PNBs in common organic solvents

which allowed for subsequent thorough detailed analysis of the polymer products. Moreover

it was also observed that high-temperature polymerization was beneficial for further improving the PNB’s solubilities due to the decreased molecular weights and stereoregularities. Different ligand skeletons and ligand equivalents were also investigated to give a comprehensive view of their influences on the polymers’ solubilities

and based on these results

a plausible mechanism that caused such a big difference was tentatively proposed.

关键词

Keywords

references

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Ni(acac)2 Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes

DOI：10.1007/s10118-022-2855-5

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Abstract

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Keywords

references

Ni(acac)₂ Mediated Vinyl Polymerization of Norbornene in the Presence of Bulky Salicylaldiminate Ligands: An Effective Strategy to Access Soluble Polynorbornenes