Polyolefin is the most important product of petrochemical industry,and majorly related to polyethylene,meanwhileα-olefins are not only co-monomer in co-polymerization but also basic substance for fine-chemical industry.Therefore the national ethylene industry represents the technical development of petrochemical industry.Regarding the newly developing process in ethylene industry,late-transition metal precatalysts achieve highly activities in oligomerization and polymerization,in which the resultant polyeth...