writer：Li Liu,1,2 Xu Zhang,1,2 Heng Liu,2 Xuequan Zhang,2 Guangping Sun,1 Hexin Zhang2
keywords：catalysts; rubber; X-ray
source：期刊
specific source：J. Appl. Polym. Sci. 2014, 131, 40511.
Issue time：2014年
A series of cationic nickel(II) compounds with various counter ions ([BF4]–, [CF3SO3]–) and N-bearing ligands (1,10-phenanthroline, benzimidazole and terpyridine) were synthesized. The simple compound, Ni(Phen)2Cl2, was prepared as a reference compound. All title compounds were characterized by elemental analysis, and infrared spectra analyses and compounds, some specific ones, were further examined by X-ray crystallographic analysis. Upon treatment with ethylaluminum sesquichloride, these nickel(II) compounds exhibited high activities (up to 88.5%/4 h) for butadiene polymerization and afforded liquid polybutadiene (Mw < 30,000) with a high cis-content (up to 92.1%). Various polymerization conditions were investigated in detail, and it was found that less steric hindrance of the ligands enhanced the catalytic activities of the nickel(II) compounds.