成功合成一系列含有不同杂原子的双齿配体及相应的三价钒配合物,并研究了其在烯烃聚合中的催化性能,揭示了催化剂结构中双齿配体与催化性能的内在联系。结果表明,在助催化剂的作用下,该系列钒配合物能高效催化乙烯聚合得到线型聚乙烯,其活性高达7 740 kg/(mol·h)。结合大位阻基团引入的策略,含有S^N两齿配体的配合物C3中表现出最佳的热稳定性,该催化剂在80 ℃的聚合条件下仍能保持较高的催化活性[5 560 kg/(mol·h)]。在乙烯与极性单体的共聚试验中,该系列三价钒催化剂也表现出中等的活性并成功制备相应的共聚物。

A series of bidentate ligands containing different heteroatoms and corresponding trivalent vanadium complexes are successfully synthesized,and their catalytic properties are evaluated in olefin polymerization to disclose the relationship between the catalytic performance and bidentate ligands in complex structure.It is found that under the activation of co-catalyst,all these vanadium complexes can efficiently catalyze ethylene polymerization to prepare linear polyethylene,showing an activity as high as 7 740 kg·(mol·h)^-1.Combined with the addition of bulky ligand in the complex,vanadium complex C3 containing S^N ligand exhibits the best thermal stability.C3 remains moderate activity at 80℃in ethylene polymerization,showing a catalytic activity of 5 560 kg·(mol·h) ^-1.In the copolymerization reaction between ethylene and polar monomers,these trivalent vanadium catalysts also show moderate activity and help to obtain the corresponding copolymers successfully.

张婷婷(1999-),女,硕士生,研究方向为钒配合物催化剂的设计与催化烯烃聚合,2506347112@qq.com