芳氧亚胺锆络合物的合成及其催化乙烯聚合

Synthesis of Bis(phenoxy-imine) Zirconium Complex and its Application in Ethylene Polymerization

摘要:

合成了水杨醛亚胺配体1和芳氧基亚胺二氯化锆络合物2，用MS、1H NMR和13C NMR表征了配体及络合物。在甲基铝氧烷（MAO）助催化下，2成功催化乙烯聚合。在50 oC、0.9 MPa乙烯压力，2在甲苯中的催化活性为53.5 kg-PE/mmol.Zr.h，所得聚合物为超高分子量聚乙烯，粘均分子量达3.3 x 106 g/mol。当使用正己烷作溶剂时，催化所得聚合物分子量提高至4.1 x 106 g/mol。

Abstract:

Salicylaldehyde imine ligand (1) and bis(phenoxy-imine) zirconium dichloride complex (2) have been synthesized. Both ligand and complex were characterized by mass spectrum, 1H NMR and 13C NMR. In the presence of MAO as a cocatalyst, the complex 2 was capable to catalyze ethylene polymerization. 2 displayed ethylene polymerization activity of 53.5 kg of PE/mmol of Zr.h at 50 oC and 0.9 MPa pressure in toluene, resulting in ultra-high molecular weight polyethylene with a viscosity average molecular weight value of 3.3x106 g/mol. The introduction of n-hexane as reaction solvent could further increase the molecular weight of obtained polymer to 4.1x106 g/mol.