Polymerization of ethylene using a series of binuclear and a mononuclear Ni (II)-based catalysts
作者:Mostafa Khoshsefat、Gholam Hossein Zohuri、Navid Ramezanian、Saeid Ahmadjo、Meisam Haghpanah
DOI:10.1002/pola.28186
日期:2016.9.15
A novel series of homo‐, bi‐, and mononuclear Ni(II)‐based catalysts (BNCn n = 1–4, MNC4) were used for ethylene polymerization. The optimum conditions for the catalyst BNC4 (the highest catalytic activity) was obtained at [Al]/[Ni]=2000/1, Tp = 42 °C, and tp = 20 min that was 1073 g PE/mmol Ni h. In theoretical study, steric and electronic effects of substituents and diimine backbone led to prominent
一种新颖的均聚物系列,双环的,和单核的Ni(II)为基础的催化剂(BNC Ñ Ñ = 1-4,MNC 4)用于乙烯聚合。在[Al] / [Ni] = 2000/1,T p = 42°C和t p = 20 min的条件下获得了催化剂BNC 4的最佳条件(最高催化活性),其为1073 g PE / mmol Ni H。在理论研究中,取代基和二亚胺主链的空间和电子效应导致对催化剂行为的显着影响。最高的M V是由BNC 4聚合产生的; 但是,最高不饱和度是从BNC 1获得的。GPC分析显示MWD较宽(PDI = 17.8)。结构相似的BNC 1和BNC 2在DSC热谱图中显示宽峰,而具有更多电子效应的BNC 3和BNC 4在宽肩上显示峰。单体压力的增加表明BNC 4的活性增强,同时在DSC热谱图中观察到一个肩峰到一个峰,并观察到所得聚合物的形态均匀。©2016 Wiley Periodicals,Inc