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 …

Direct synthesis of polyethylene thermoplastic elastomers with high molecular weight and excellent elastic recovery via a hybrid steric bulky strategy

W Lu, B Ding, W Zou, S Dai - European Polymer Journal, 2023 - Elsevier
Recently, α-diimine nickel-catalyzed ethylene chain walking polymerization has enabled the
direct preparation of polyethylene thermoplastic elastomers using ethylene as a single …

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) …

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 …

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 …

Star ultrahigh-molecular-weight polyethylene

C Wang, S Wu, Q Chen, H Mu, Z Jian - Macromolecules, 2023 - ACS Publications
Star polymers have attracted immense interest from scientific and industrial communities
due to their unique properties relative to linear polymers; however, the synthesis of the long …

Switchable synthesis of ethylene/acrylate copolymers by a dinickel catalyst: Evidence for chain growth on both nickel centers and concepts of cation exchange …

S Xiong, HA Spinney, BC Bailey, BS Henderson… - ACS …, 2024 - ACS Publications
A dinickel complex, X-Ni 2, was developed and demonstrated to have a high performance in
ethylene/acrylate copolymerization. Further mechanistic studies revealed that X-Ni 2 …

High-performance polyethylene elastomers using a hybrid steric approach in α-diimine nickel precatalysts

H Saeed, Q Mahmood, R Yuan, Y Wang, S Zou… - Polymer …, 2024 - pubs.rsc.org
The synthesis of polyethylenes with concurrent high mechanical and elastic properties at
elevated reaction temperatures using nickel catalysts proves to be challenging, primarily …

Direct Synthesis of Ultrahigh Molecular Weight Functionalized Isotactic Polypropylene

G Zhou, H Mu, X Ma, X Kang, Z Jian - CCS Chemistry, 2023 - chinesechemsoc.org
Ultrahigh molecular weight functionalized isotactic polypropylene (f-UHMW-iPP) through the
direct copolymerization of propylene with polar monomers is highly desirable but has not …