Promoting Ethylene (co)Polymerization in Aliphatic Hydrocarbon Solvents Using tert-Butyl Substituted Nickel Catalysts

• 作者: Ao Chen Daohong Liao Changle Chen
• 来源期刊: 中国化学（英文版）
• 年，卷（期）: 2022,（2）
• 所属期刊栏目: Concise Reports
• 页码范围: 215-222
• 页数: 8页
• 语种: 英文
• DOI: 10.1002/cjoc.202100642

摘要

In the past few decades,the development of high-performance catalysts has been a key driving force and a center of research efforts in the field of olefin polymerization.However,a major discrepancy exists between industrial researches which utilize aliphatic hy-drocarbon solvents,and academic researches which predominantly focus the catalytic properties in aromatic solvents.In this con-tribution,a novel diaryl-methyl aniline bearing eight tert-butyl groups was prepared and subsequently transformed to four different kinds of imine-type ligands.The corresponding nickel complexes as well as their counterparts derived from diphenyl-methyl aniline without the tert-butyl groups were prepared and investigated in ethylene polymerization.The multiple tert-butyl groups enable great solubility of the metal complexes in aliphatic hydrocarbon solvents,leading to similar polymerization properties comparing with aromatic solvents.In contrast,their counterparts without tert-butyl groups demonstrate significant solvent effect.Moreover,the ligand electronic and steric effects induced by the tert-butyl groups lead to nickel catalysts with great thermal stability (up to 140℃) and capabilities of generating high molecular weight polymer and copolymer products.This tert-butyl strategy can be potentially applied to many different polymerization catalyst systems and help to bridge academic studies with practical applications.