Enhancement on Hemilabile Phosphine-Amide Palladium and Nickel Catalysts for Ethylene (Co)Polymerization with Polar Monomers Using a Cyclizing Strategy |
| |
Authors: | Cui Lei Chu Yu-Kai Liu Da-Jun Han Ying-Feng Mu Hong-Liang Jian Zhong-Bao |
| |
Institution: | 1.State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China ;;2.School of Chemistry and Environmental Engineering, Changchun University of Science and Technology, Changchun, 130022, China ;;3.Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education, College of Chemistry and Materials Science, Northwest University, Xi’an, 710127, China ; |
| |
Abstract: | To address the issue of hemilabile catalyst in olefin polymerization catalysis, a cyclizing strategy was used to construct novel N-bridged phosphine-carbonyl palladium and nickel catalysts, resulting in improvements on ethylene (co)polymerizations. The N-bridged phosphine-carbonyl Pd catalysts (Pd1?Pd5) and Ni catalysts (Ni1?Ni5) bearing five- to eight-membered-ring structures were designed and synthesized. Catalytic performance for ethylene (co)polymerization became better as the size of N-containing bridge increased. The seven-membered-ring bridged catalysts Pd4 and Ni4 exhibited the best performance in terms of catalytic activity, polymer molecular weight and incorporation of acrylates and acrylic acid. The better performance of these catalysts bearing larger-size bridges was tentatively attributed to the methylene-induced higher electron density around nitrogen, which strenghtens the coordination of carbonyl group to metal center, and also to the steric effect offered by this cyclization. This work provides a new strategy to enhance hemilabile polymerization catalysts. |
| |
Keywords: | |
本文献已被 维普 SpringerLink 等数据库收录! |
|