DOI: 10.1016/j.scib.2021.03.012
论文题名: A disubstituted-norbornene-based comonomer strategy to address polar monomer problem
作者: Xu M. ; Chen C.
刊名: Science Bulletin
ISSN: 20959273
出版年: 2021
卷: 66, 期: 14 起始页码: 1429
结束页码: 1436
语种: 英语
中文关键词: Norbornene
; Olefin polymerization
; Palladium
; Polar monomer
; Polyolefin
英文关键词: Catalysts
; Copolymerization
; Ethylene
; Molecular weight
; Palladium
; Phosphorus compounds
; Comonomer incorporation
; Comonomers
; Copolymerisation
; Metal centres
; Metal-catalyzed
; Norbornenes
; Olefins polymerizations
; Polar comonomers
; Polar groups
; Polar monomer
; Monomers
英文摘要: The transition-metal-catalyzed copolymerization of olefins with polar comonomers is a direct strategy to access polar-functionalized polyolefins in an economical manner. Due to the intrinsic poisoning effect of polar groups towards Lewis acidic metal centers and the drastic reactivity differences of polar comonomers versus non-polar olefins, it is challenging to develop catalysts that provide the desired polymer molecular weight, comonomer incorporation, and activity. In this contribution, we tackle this issue from a comonomer perspective using 5,6-disubstituted norbornenes, which are highly versatile, easily accessible, inexpensive, and capable of introducing two functional groups in a single insertion. More importantly, they are only mildly poisoning due to the presence of long spacers between double bonds and polar groups, and are not prone to β-hydride elimination due to their cyclic structures. As strong π-donors, they can competitively bind to metal centers versus olefins. Indeed, phosphine-sulfonate palladium catalysts can catalyze the copolymerization of ethylene with 5,6-disubstituted norbornenes and simultaneously achieve a high polymerization activity, copolymer molecular weight, and comonomer incorporation. The practicality of this system was demonstrated by studying the properties of the resulting polymers, copolymerization in hydrocarbon solvents or in bulk, recovery/utilization of unreacted comonomer, molecular weight modulation, and large-scale synthesis. © 2021 Science China Press Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/170465
Appears in Collections: 气候变化与战略
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作者单位: Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei, 230026, China
Recommended Citation:
Xu M.,Chen C.. A disubstituted-norbornene-based comonomer strategy to address polar monomer problem[J]. Science Bulletin,2021-01-01,66(14)