Abstract:The synthesis and microstructure of copolymer was investigated. The copolymerization activity influenced by temperature, different protecting groups of polar comonomers and the concentration of comonomer was studied. The incorporation rate of comonomer was analyzed by 1H NMR. There was a large difference in activity of copolymerizing ethylene with polar comonomer which own different protecting groups. The bulky protecting group can result in a higher activity. The concentration of comonomer influence little the activity of copolymerization. The activity of the copolymerization increased with temperature with its highest value at 20℃. Further increasing temperature decreased the catalyst activity. The incorporation rate of comonomer was increasing by temperature at a constant concentration of comonomer. Because the activity of polymerization lowed by temperature, the conversion of comonomer decreased. Besides, the incorporation rate of comonomer increased as the concentration of comonomer.
Key words: the late transition metal catalyst; α-diimine Ni catalyst; hyperbranched polyethylene; polar comonomer; functional;