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在从均相稀土Ziegler-Natta催化剂中分离出有双烯聚合活性的Nd-Al双金属配合物的基础上,利用该配合物可在无助催化剂烷基铝存在下单独引发丁二烯聚合的特性,详细研究了活性体、外加烷基铝、单体浓度,温度及时间等变量对聚合的影响;对比了活性体引发聚合与一般Ziegler-Natta催化聚合在一般规律上的异同。以更客观的实验事实论证了烷基铝在聚合过程中的作用,通过聚合产物的GPC测定讨论了活性体聚合中存在的键转移反应,确认外加烷基铝的键转移能力最强。所得结果有助于对稀土催化定向聚合过程的深入了解。
Based on the separation of Nd-Al bimetallic complexes with diolefin polymerization activity from homogeneous rare earth Ziegler-Natta catalysts, this complex can be used to initiate polymerization of butadiene in the absence of a co-catalyst aluminum alkyl The influences of active species, aluminum alkyls, monomer concentration, temperature and time on the polymerization were investigated in detail. The similarities and differences of the general rules of active polymerization and general Ziegler-Natta polymerization were compared. The effect of alkyl aluminum in the polymerization process was demonstrated by more objective experimental results. The key shift reaction in the polymerization of the active polymer was discussed by GPC measurement of the polymerization product, confirming that the bond transfer ability of the external aluminum alkyl was the strongest. The results obtained help to understand the rare earth catalytic polymerization process.