| Polyolefin material is one of the high polymer materials with large market demand,which plays an important role in our daily life.Polyolefin materials have attracted people’s attention because of their good mechanical strength,low permanent deformation after compression,and chemical corrosion resistance.However,the development of polyolefin materials is closely related to the development of new catalysts.The structure of catalysts can determine the microstructure of polyolefin polymers and thus affect the macroscopic properties of polyolefin materials.In the history of olefin polymerization,late-transition metal catalysts often show excellent catalytic performance in the polymerization of polycyclic olefin due to their stable properties and effective catalytic performance.Bidentate and tridentate late-transition metal catalysts have been widely used in olefin polymerization.In this paper,a series of bidentate and tridentate late-transition palladium/nickel catalysts were synthesized and applied to the polymerization of norbornene.1.A series of amine tridentate Pd/Ni catalysts containing benzimidazole groups were synthesized and their activities in catalytic polymerization of norbornene were investigated.These catalysts show good catalytic activity(up to 2.35×106 g mol-1 h-1)in the presence of only a small amount of cocatalyst during the polymerization of norbornene.The influence of catalyst structure change on catalytic activity was investigated by modifying the structure of catalyst.2.A series of imine bidentate Pd/Ni catalysts containing benzimidazole groups were prepared.and applied to catalyze the polymerization of norbornene,and the catalytic performance of bidentate metal catalysts was investigated.It was found that the series of catalysts had catalytic activity for the polymerization of norbornene,with the highest conversion rate of 92.3%and the highest catalytic activity of 9.2×105 g mol-1 h-1. |
