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DOI	10.1016/j.scib.2021.03.012
	A disubstituted-norbornene-based comonomer strategy to address polar monomer problem
	Xu M.; Chen C.
发表日期	2021
ISSN	20959273
起始页码	1429
结束页码	1436
卷号	66 期号:14
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
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
语种	英语
来源期刊	Science Bulletin
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/207631
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
推荐引用方式 GB/T 7714	Xu M.,Chen C.. A disubstituted-norbornene-based comonomer strategy to address polar monomer problem[J],2021,66(14).
APA	Xu M.,&Chen C..(2021).A disubstituted-norbornene-based comonomer strategy to address polar monomer problem.Science Bulletin,66(14).
MLA	Xu M.,et al."A disubstituted-norbornene-based comonomer strategy to address polar monomer problem".Science Bulletin 66.14(2021).