The Systhesis Of Functional Polyolefin Using Late-transition-metal Catalyst

Thanks to the outstanding mechanical property and price advantage,polyolefin has become an indispensable material in the modern life.With the continuous development of the catalysts used in the field of polyolefin,the products of polyolefin become more and more abundant and their performance become more and more excellent,which promotes the development of the whole polyolefin industry.As far as the current market situation is concerned,the demand for polyolefin is still very huge.However,its nonpolarity is one of its greatest drawbacks.By introducing some polar functional groups into polyolefins,many of its performance can be significantly improved,such as surface properties(printability,coating property,etc.),toughness,compatibility,barrier property and so on.Therefore,the research of polyolefin,especially functional polyolefin,occupies an important position in the field of polyolefin.1.We synthesized silicon-functionalized polyolefins through subsequent cobalt-catalyzed dehydrogenative silylation and nickel-catalyzed copolymerization reactions.Specifically,a series of allylsilanes were efficiently generated through the pyridine-diimine cobalt-catalyzed dehydrogenative silylation of a variety of terminal olefins with alkylsilanes.Subsequently,a-diimine nickel-mediated copolymerizations of ethylene with these allylsilanes afforded silicon-functionalized polyolefin materials;high activities,moderate comonomer incorporations,and highmolecular weights were observed during these copolymerization reactions.This provides an alternative polymerization route that uses abundant and inexpensive alkylsilanes.2.In the third part of this article,We designed and synthesized a new series of catalysts with neutral k2-P,N-ligands comprising an imine and a phosphine binding site to explore the effect of ethylene homopolymerization and copolymerization of ethylene/polar monomers.We hope it will provide new ideas for the design of high efficiency metal catalyst uesd in the field of polyolefin.