"Supported Ziegler-Natta catalysts from MgCl2·nROH precursors and its catalytic behaviors for diene copolymerization"

Abstract

The precursor MgCl2 · nROH of supported Ziegler Natta catalyst was prepared by chemical activation method, and different pre catalysts TiCl4/MgCl2 (C-Cat) were prepared by loading TiCl4. At the same time, the pre catalysts TiCl4/MgCl2 (P-Cat) and C-Cat were prepared by physical grinding method for comparison, and the copolymerization behavior of butadiene isoprene catalyzed by different pre catalysts was further studied. Research has found that the precursor particles prepared with n-propanol have a rougher surface and a larger specific surface area (51.5 m2/g). They exhibit high catalytic efficiency (6238 g/g) in catalyzing the copolymerization of butadiene and isoprene, which is 32.8% higher than the P-Cat catalytic efficiency. The Ziegler Natta pre catalysts prepared by different activation methods all exhibit high trans-1,4- structure oriented polymerization characteristics, with a trans-1,4- structure mole fraction of isoprene segments greater than 94%

Keywords

• ziegler natta catalyst， magnesium chloride，butadiene isoprene copolymerization，chemical activation，catalytic efficiency，