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Your search keyword '"Li, Chuan-Zhao"' showing total 2 results
Start Over Author "Li, Chuan-Zhao" Topic ethylene
2 results on '"Li, Chuan-Zhao"'

1. Synthesis, Characterization, and Polymerization of a Neutral Tantalacarborane Sandwich Complex Derived from a Pentaanionic Exo-Polyhedrally Linked Bis(C2B10-carborane) Ligand

Author

Lee Cjin Nong, Chong Siow Hwei, Li Chuan Zhao, Wang Cun, Martin van Meurs, Zhu Yinghuai, Effendi Widjaja, Jozel Tan, Narayan S. Hosmane, and John A. Maguire

Subjects
Ethylene, Ligand, Organic Chemistry, Tantalum, chemistry.chemical_element, Characterization (materials science), Catalysis, Inorganic Chemistry, chemistry.chemical_compound, Polymerization, chemistry, Polymer chemistry, Carborane, Physical and Theoretical Chemistry
Abstract

Tetramethyldisilazane-bridged closo-carborane compounds, [(closo-1-R-1,2-C2B10H10)Me2Si]2NH (R = Me (1), Ph (2)), and their tantalum complexes, [(closo-2-R-2,3-C2B10H10)Me2Si]2N]Ta(V) (R = Me (3), Ph (4)), have been prepared and characterized. Compounds 3 and 4 were found to be active catalysts for the polymerization of ethylene in the presence of the cocatalyst MAO to produce two morphologically different polyethylenes with high molecular weight.

Published
2008

2. Highly active self-assembled group-IV-metal multinuclear catalysts for ethylene polymerization.

Author

Luo, He-Kuan, Wang, Cun, Rusli, Wendy, Li, Chuan-Zhao, Widjaja, Effendi, Wong, Pui-Kwan, Stubbs, Ludger Paul, and Van Meurs, Martin

Subjects
*MOLECULAR self-assembly, *METAL catalysts, *ETHYLENE, *POLYMERIZATION, *POLYETHYLENE, *PHENOXIDES
Abstract

Group-IV metals play an important role in the production of practical catalysts for polyethylene industry. To develop new highly active catalysts, we designed a new self-assembly strategy that leads to a new family of group-IV-metal multinuclear catalysts with bis-phenoxy-imine ligands. These multinuclear catalysts are formed via three bridging strategies, by linking the imine-N, the 4-position of phenolate, or the mixed linking strategy. The coordination environment of the catalysts was investigated with far-IR and Raman. The multiple imine-H shift found in 1 H NMR revealed that the multinuclear catalysts are typical multi-site catalysts comprising of different coordination geometries. All the multinuclear catalysts were more active and stable, and produced polyethylene of higher MW than the corresponding mono-nuclear catalysts. The bridging spacer has an evident effect on catalytic activity, stability, polymer MW and incorporation rate of propylene into the polyethylene backbone. [ABSTRACT FROM AUTHOR]

Published
2015
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