Ethylene polymerization by Phenyl sulfide bridged dinuclear titanocene complex/MAO

摘要

The phenyl sulfide bridged metallocene complex [(C_5H_5)Cl_2TiC_5H_4CH_2(C_6H_(4-p))]_2S has been synthesized by treating the dilithium salts of the phenyl sulfide bridged cyclopentadienyl ligand with two equivalents of C_5H_5TiCl_3 and characterized by HMNR and elemental analysis. After activation with methylaluminoxane (MAO), the complex was highly active catalysts for homogeneous ethylene polymerization in toluene. The influence of the molar ratio [MAO]/[Cat], the catalyst concentration, time and temperature have been studied systematically. The highest catalytic activity of 1 is up to 8.30×10~5 g PE/mol·Cat·h. Rising the polymerization temperature decreases the catalytic activity for 1. High temperature gel permeation chromatography (HT-GPC) proves the production of polyethylene with a broad molecular weight distribution (MWD), which is reached 10.11.