Homo- and Copolymerizations of Ethylene and Norbornene Using Bis(β-ketoamino) Titanium Catalysts Containing Pyrazolone Rings.

ABSTRACT: A series of bis(β-ketoamino) titanium complexes containing pyrazolone rings (1⁻3) have been synthesized, characterized, and used as precursors for homo- and copolymerization of ethylene and norbornene. The titanium complexes activated with methylaluminoxane (MAO) exhibited good activities for homopolymerization of ethylene (E) to produce linear polyethylenes (PEs). Ethylene⁻norbornene copolymers (E⁻N) were also prepared by these catalysts with moderate activities, and influences of ligand substituents and norbornene addition on copolymer microstructure were studied in detail. Microstructure analysis of the E⁻N copolymers by ¹³C NMR and differential scanning calorimetry (DSC) techniques showed that alternating (ENEN) and isolated (ENEE) norbornene predominately appe

SUBMITTER: Pei L 

PROVIDER: S-EPMC6432339 | biostudies-literature | 2017 Jun

REPOSITORIES: biostudies-literature