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Since the discovery of Ziegler-Natta catalyst,much attention is paid to the development of efficient catalysts for olefin polymerization and copolymerization in both basic research and industrial applications.In the past two decades,single-site non-metallocene catalysts are of great interest due to their elegant capability to promote the olefin polymerization and the copolymerization of ethylene with α-olefins or cycloolefins,allowing access to previously inaccessible polymers.