论文部分内容阅读
A new polymer-supported metallocene catalyst has been prepared. The polymer- supported metallocene displayed considerably high activity in ethylene polymerization, the highest being 3.62(107gPE/molZr(h, the molecular weight of the polyethylene produced was Mn = 1.29(105, about 3-4 times those of corresponding homogeneous zirconocenes. The polymer- supported metallocene keeps the characteristics of homogeneous metallocene catalysts, and offers some features,such as adaptable to gas phase and slurry processes; easy to prepare in low cost; relatively high activity and lower MAO/Zr ratio; lower inorganic residues in the polyolefins as compared to cases of SiO2, Al2O3 or MgCl2; unitary active structure, no complex surface as with SiO2; good control of morphology of the resulting polymer.
The polymer-supported metallocene catalyst exhibited considerably high activity in ethylene polymerization, the highest being 3.62 (107 gPE / mol Zr (h, the molecular weight of the polyethylene produced was Mn = 1.29 (105, about 3-4 times those of corresponding homogeneous zirconocenes. The polymer- supported metallocene keeps the characteristics of homogeneous metallocene catalysts, and offers some features, such as adaptable to gas phase and slurry processes; easy to prepare in low cost; relatively high activity and lower MAO / Zr ratio; lower inorganic residues in the polyolefins as compared to cases of SiO2, Al2O3 or MgCl2; unitary active structures, no complex surface as with SiO2; good control of morphology of the resulting polymer.