Abstract

Data on the effect the concentrations of the monomer, triethylaluminium, and hydrogen on the molecular weight of polyhexene upon 1-hexene polymerization over supported titanium–magnesium catalyst are obtained. The ratios between propagation rate constant and the rate constants of the reactions of polymer chain transfer with monomer, triethylaluminium (AlEt₃), triisobutylaluminium, and hydrogen are calculated. The data allow us to estimate the effect of individual reactions of chain transfer on the polymer’s molecular weight under different polymerization conditions. The data help to select polymerization conditions for obtaining polyhexene of a desired molecular weight. The heterogeneity of active centers is observed in the reaction of chain transfer with hydrogen when using AlEt₃ as co-catalyst, which alters the polymer’s polydispersity when the concentration of hydrogen is varied in the reaction mixture. The molecular weight distribution is analyzed via resolution into Flory components for polyhexene characterized by different polydispersity.

中文翻译：

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高活性负载钛-镁催化剂上1-己烯聚合反应链转移反应的动力学研究

摘要

获得了在负载的钛-镁催化剂上进行1-己烯聚合时，单体，三乙基铝和氢的浓度对聚己烯分子量的影响的数据。计算传播速率常数与聚合物链转移与单体，三乙基铝（AlEt ₃），三异丁基铝和氢的反应的速率常数之间的比率。数据使我们能够估计在不同聚合条件下链转移的各个反应对聚合物分子量的影响。数据有助于选择聚合条件以获得所需分子量的聚己烯。使用AlEt ₃时，在链转移与氢的反应中观察到活性中心的异质性作为助催化剂，当反应混合物中的氢气浓度变化时，它会改变聚合物的多分散性。通过解析成具有不同多分散性的聚己烯的弗洛里组分来分析分子量分布。