Unexpected effect of catalyst's structural symmetry on the branching microstructure of polyethylene in late transition metal polymerization catalysis

Z Lu, X Xu, Y Luo, S He, W Fan, S Dai - ACS Catalysis, 2022 - ACS Publications
In this study, several α-diimine nickel complexes were prepared by merging a bulky
dibenzobarrelene backbone and bulky dibenzhydrylanilines. The single-crystal X-ray …

Stable ultrahighly branched polyethylene synthesis via externally robust chain-walking polymerization

H Fan, X Kang, S Dai - ACS Catalysis, 2024 - ACS Publications
Recently, late-transition-metal-catalyzed chain-walking polymerization has emerged as a
promising method for synthesizing a range of polyethylenes, including linear, branched, and …

Control of chain transfer and chain walking by tailored metal–π interactions in polymerization catalysis

W Lu, B Ding, S Dai - Journal of Catalysis, 2024 - Elsevier
Chain walking and chain transfer are pivotal processes that govern the microstructure and
molecular weight of polyolefins synthesized via late transition metal-catalyzed ethylene (co) …

Synergistic influence of methoxy and benzhydryl groups in α-diimine nickel precatalysts for facile synthesizing UHMW PE elastomers

R Yuan, Y Wang, Q Mahmood, Y Zeng, L Qin, S Zou… - Polymer, 2024 - Elsevier
Concerted effect of steric and electronic substituents is a powerful strategy to enhance the
catalytic performance of α-diiminonickel precatalysts for ethylene polymerization, but less …

Synthesis of polyolefin elastomers from amine-imine nickel-catalyzed ethylene polymerization

H Deng, H Zheng, CS Cheung, D Li, H Gao, Q Lv… - European Polymer …, 2024 - Elsevier
The catalytic synthesis of polyolefin elastomers by using ethylene as a sole feedstock is
fascinating, while currently reported chain walking catalysts are only limited to α-diimine …

Flexible axial shielding strategy for improving ethylene (co) polymerization with 8-cycloalkylnaphthyl α-diimine catalysts

Z Lu, Y Ge, S Dai - Inorganic Chemistry, 2023 - ACS Publications
8-aryl or alkyl-naphthyl substituents are widely used as an effective axial shielding strategy
for the suppression of chain transfer in late-transition metal-catalyzed ethylene (co) …

Facile access to diverse polyethylenes via neutral salicylaldiminato nickel catalysts

Q Li, H Mu, Z Jian - Polymer Chemistry, 2023 - pubs.rsc.org
A new family of neutral salicylaldiminato nickel (II) catalysts (Ni1–Ni5) is developed with
various well-designed ortho substituents to the phenoxy moiety and these show moderate to …

Enhancing suppression of chain transfer via catalyst structural evolution in ethylene (co) polymerization

B Ding, L Jiang, X Kang, S Dai - Chinese Journal of Chemistry, 2023 - Wiley Online Library
Comprehensive Summary Usually, the aniline‐based late‐transition‐metal catalysts often
require bulky steric substituents on both sides of the ortho‐aryl position to achieve efficient …

Impact of o-aryl halogen effects on ethylene polymerization: steric vs. electronic effects

J Dai, S Dai - Dalton Transactions, 2024 - pubs.rsc.org
Ligand steric hindrance and electronic effects play a crucial role in late-transition metal-
catalyzed olefin polymerization. In this research, a series of o-aryl halogenated α-diimine …

Preparation of polyethylene thermoplastic elastomers using CS-symmetric nickel catalysts in ethylene polymerization

W Yuan, W Li, S Dai - Polymer, 2023 - Elsevier
Recently, the structural symmetry of α-diimine nickel catalysts was demonstrated to have a
pronounced effect on the microstructure of the resulting polyethylene. In this study, two plane …