Introducing electron-donating substituents on ligand backbone of α-diimine nickel complex and the effects on catalyst thermal stability in ethylene polymerization
作者:Feng He、Dan Wang、Baiyu Jiang、Zhen Zhang、Zhenmei Cheng、Zhisheng Fu、Qisheng Zhang、Zhiqiang Fan
DOI:10.1016/j.ica.2018.08.048
日期:2019.2
between the electron-rich ligand and the nickel center should be the main reasons for longer catalyst lifetime and enhanced thermal stability of Cat.1. The production of polyethylene with higher molecular weight by Cat.1 can be explained by its larger kp value and more stable transition state for ethylene insertion than for chain transfer reaction due to the electron-donating ligand. Overall, the results
The invention provides a polymer of formula I:
wherein A, B, D, E, R
1
, and R
2
have any of the values defined in the specification, as well as electrical devices comprising such polymers.