Synthesis of ultrahigh-molecular-weight ethylene/1-octene copolymers with salalen titanium(iv) complexes activated by methyaluminoxane.

ABSTRACT: Two salalen titanium(iv) complexes ((H-salalen)TiCl₂ and (F-salalen)TiCl₂) containing hydrogen and fluorine respectively on the phenolate ring close to the imine were synthesized for the copolymerization of ethylene with 1-octene to prepare poly(ethylene-co-1-octene) in the presence of methylaluminoxane (MAO). The (F-salalen)TiCl₂/MAO showed higher catalytic activity and better copolymer characteristics such as a higher molecular weight, narrower molecular weight distribution, and higher 1-octene incorporation than (H-salalen)TiCl₂/MAO, which revealed that the electron-withdrawing conjugated effect introduced by fluorine substituents led to improvements on catalytic performance and thermal stability. The influences of copolymerization cond

SUBMITTER: Zou B 

PROVIDER: S-EPMC9010129 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature