Ultrahigh activity and broad temperature resistance of amine–imine cobalt precatalysts for butadiene polymerization
作者:Yuan Fu、Jian Tang、Jing Hua
DOI:10.1039/d3dt02460a
日期:——
system. The catalyst also exhibited excellent tolerance towards the ratio of Co/Bd and broad temperature stability. At a ratio of Bd/Co3 = 50 000, the complexes Co1–3 can afford polybutadiene with yields higher than 96% within 2 hours. At −20 °C to 100 °C, the complex Co3 afforded relatively high polymer yields at low catalyst concentrations (Bd/Co3 = 25 000). In addition, all polymers showed a relatively
一系列胺-亚胺钴配合物(Co1-Co7)已被制备和表征。通过单晶X射线衍射测定,配合物Co3、Co4和Co6具有扭曲的四面体几何形状。在倍半氯化乙基铝(EASC)存在下,Co3对丁二烯(Bd)聚合表现出超高活性(高达 7813 kg聚合物mol -1 h -1)。该活性高于迄今为止通过明确的后过渡金属催化体系产生高顺式-1,4聚丁二烯的记录。该催化剂还表现出对 Co/Bd 比例的优异耐受性和宽温度稳定性。当Bd/ Co3 =50 000时,配合物Co1-3可以在2小时内得到聚丁二烯,收率高于96%。在-20 °C 至 100 °C 范围内,复合Co3在低催化剂浓度下提供了相对较高的聚合物产率 (Bd/ Co3 = 25 000)。此外,所有聚合物均表现出相对较高的分子量(高达1.06×10 6 g mol -1)。