新型多核苊二亚胺镍配合物复合负载催化剂催化乙烯聚合

制备了两种多核苊二亚胺镍配合物N imL1C l2m和N imL2C l2m,并将其负载于M gC l2和S iO2上制备复合载体催化剂,与通用烷基铝组成新的催化体系催化乙烯聚合。研究结果表明,在A lE t2C l为助催化剂的条件下,两种多核苊二亚胺镍配合物能高效催化乙烯进行聚合,制得不同支链的各种支化聚乙烯;聚合条件对乙烯聚合活性和产物性能有较大的影响。制得产物的支链使聚乙烯的熔融峰变宽,并且支化度越高,熔融峰越宽。

Nickel Acenaphthenediimine Complexs Supported on MgCl2/SiO2 for Preparing Branched Polyethylene

In this thesis,two kinds of nickle acenaphthenediimine complexes Ni_mL_1Cl_(2m) and Ni_mL_2Cl_(2m) were successfully prepared.Then they were supported on MgCl_2 and silica with AlEt_2Cl as cocatalyst to form novel catalysts,and subsequently initiated the polymerizations of ethylene.Results show that nickel acenaphthenediimine complexes can be activated and then initiated the polymerization of ethylene.Moreover,pronounced effects on the catalytic activity of polymerization can also be noticed when the other polymerization conditions varied.Branches distribution of polyethylenes was investigated by()~(13)C-NMR spectroscopy,and methyl,ethyl,propyl, butyl,amyl and long branches were found on the backbone of polyethylenes.DSC results show that the melting peak of branched polyethylene broadens with the increase of branching degree.