Synthesis of γ -Acyloxy Ethers as Internal Electron Donors in Ziegler-Natta Catalysts for the Polymerization of Propene

摘要

High activity Ziegler-Natta solid catalysts for the polymerization of propene were made from components including titanium tetrachloride, magnesium chloride and Lewis base called an internal electron donor. In polymerization, the solid catalysts were used in combination with an aluminium alkyl co-catalyst and an external donor. It was reported that al,3-diether (such as 9,9-bis(methoxymethyl) fluorine) or a phthalate (such as diisobutyl phthalate), was used as an internal donor in a Ziegler-Natta catalyst for the polymerization of olefins. But the internal donor with both groups of ether and ester has not been reported yet. We synthesized γ-acyloxy ethers (Ⅳ)with both groups of ether and ester, and a fluorene fragment in the molecular structures, and found that γ-acyloxy ethers were also effective as the internal donors.