双(咪唑啉-2-亚胺)吡啶铁、镍配合物引发的烯烃聚合行为

研究了含双(咪唑啉-2-亚胺)吡啶配体的铁、镍配合物在不同温度、不同助催化剂下对烯烃聚合行为的研究。铁配合物经改性甲基铝氧烷(MMAO)的活化对乙烯聚合具有良好的活性,并于60℃达到最高活性为1.68×10~6g PE/mol/h,且在较高的温度下活性并未衰减,所得聚乙烯的数均分子量可高达22万。镍配合物分别在助催化剂MMAO和甲基铝氧烷(MAO)的作用下对降冰片烯均表现出很高的活性,MAO体系的活性最高达7.65×10~7g/mol/h,产物的数均分子量达到50万;MMAO体系的活性虽然比MAO体系低(1.464×10~7g/mol/h),但产物的数均分子量最高可达150万。

Olefin polymerization behavior of Fe,Ni complexes bearing bis(imidazolin-2-imino)pyridine ligand

Olefin polymerization behavior of Fe, Ni complexes bearing bis(imidazolin-2-imino)pyridine ligandin combination with different cocatalyst was studied by changingpolymerization temperature.Fe complex activated by modified methyaluminoxane(MMAO)showed excellent activity for ethylenepolymerization with highest activity of up to 1.68×10.6gPE/mol/h at 60 ℃and didnot decreased significantly at higher temperature.Molecular weight of polyethylene decreased by increasing the polymerization temperature and with a highest value of 220 000.Nickel complex activated by MMAO and methyaluminoxane(MAO), respectively, showed good activity for norbornene polymerization under different polymerization temperature.The MAO system showed high polymerization activity value of 7.65×10.7 g/mol/h toproduce high molecular weight polynorbornene(Mn=500 000), while the MMAO system showed a lower polymerization activity value(1.464×10.7 g/mol/h),butultrahigh molecular weight polynorbornene(Mn=1 500 000) was obtained.