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Rational design of nickel catalysts containing N-acylated imidazolin-2-imine ligand for ethylene copolymerization with polar monomer
Journal of Catalysis ( IF 7.3 ) Pub Date : 2020-01-31 , DOI: 10.1016/j.jcat.2020.01.009
Yanqing Li , Hailong Cheng , Ru Xiao , Zhengguo Cai

By taking advantage of electronic influence of ligand design, the novel neutral nickel complexes bearing strong electron-donating N-acylated imidazolin-2-imine ligand were synthesized and characterized. The nickel catalysts conducted ethylene polymerization with high activity and good thermal stability, affording semicrystalline polyethylene with short chain branches (32–46/1000 C atoms). The complex Ni2 bearing adamantyl substituent on the imidazoline ligand showed higher activity than phenyl substituted complex Ni1, and highest activity was observed at 60 °C (up to ~106 g⋅mol−1⋅h−1). Most importantly, the catalysts were also effective for the copolymerization of ethylene and 5-hexenyl acetate with moderate activity (~105 g⋅mol−1⋅h−1). The microstructure analyses by the 13C NMR spectroscopy indicated that the 5-hexenyl acetate was successfully incorporated into the polyethylene main chain with reasonable comonomer content.



中文翻译:

N-酰化咪唑啉-2-亚胺配体的镍催化剂用于乙烯与极性单体共聚的镍催化剂的合理设计

利用配体设计的电子影响,合成并表征了具有强给电子性N-酰化的咪唑啉-2-亚胺配体的新型中性镍配合物。镍催化剂以高活性和良好的热稳定性进行了乙烯聚合,提供了具有短链分支(32-46 / 1000 C原子)的半结晶聚乙烯。复杂NI2对咪唑啉轴承金刚烷基取代基的配体显示出比苯基取代的复杂更高的活性NI1,并在60℃下(最高被观察到〜最高活性10 6  g⋅mol -1 ⋅h -1)。最重要的是,该催化剂对于具有中等活性(〜10 5  g·mol -1 -1 h -1)的乙烯和乙酸5-己烯基酯的共聚也是有效的。13 C NMR光谱的显微结构分析表明,乙酸5-己烯基酯已成功地掺入到具有合理共聚单体含量的聚乙烯主链中。

更新日期:2020-01-31
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