新型后过渡金属催化剂乙烯均聚物和共聚物分子设计裁剪

Later transition metal catalysts have attracted much interest not only because they have single active species and higher activity as the same as metallocene catalysts, but also they can catalyize ethylene copolymerization with vinly polar monomer. According to molecular design conception of catalysts, the rule of ethylene homo- and copolymerization catalyzed by iron- and cobalt-based complexes with different bulky 2,6-bis(imio)pyridyl ligands and nickle- and palladium-based complexes with different bulky diimine ligands activated by modified methylaluminoxanes (mMAO) is investigsted. The influences of ancillary ligands of later transition metal catalysts on ethylene homo- and copolymerization are alsotested. The high-activity and low-cost novel later transition metal catalysts are optimized for ethylene homopolymerization or copolymerization of ethylene with higher alpha-olefin to synthesize linear full density polyethylene. Functional polyethylene new material are also prepared through copolymerization of ethylene with functionalized vinyl monomer (such as acrylate and vinyl acetate) using these novel later transition metal catalysts at normal pressure. The microstructure and properties of resultant polymers are characterized by modern analytical methods. Catalytic activity, molecular weight, molecular weight distribution and miscrostructure of homo- and copolymer depended on polymerization conditions, including polymerization temperature, molar ratio of aluminum and later transition metal and comonomers feed ratio. The resultant polymers were characterized with 13C NMR, FTIR, DSC, GPC, WAXD.

运用催化剂分子设计构思，比较研究具有不同有机主配体或辅助配体的铁（Fe）和钴（Co）系列有机金属络合物与改性的甲基铝氧烷（mMAO）组成的催化剂进行乙烯均聚和共聚合规律。优化出高活性、低费用新型后过渡金属催化剂，能够催化乙烯均聚及乙烯与高级a--烯烃簿酆希铣上咝匀芏染垡蚁怀Ｑ瓜麓呋蚁┯胍蚁┗缘ヌ骞ぞ酆希票感滦凸δ芑垡蚁┎牧稀