Hydrogen effect on the molecular weight distribution of polymers obtained by polymerization of ethylene and α‐olefins over supported titanium‐magnesium catalysts,Journal of Applied Polymer Science

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Hydrogen effect on the molecular weight distribution of polymers obtained by polymerization of ethylene and α‐olefins over supported titanium‐magnesium catalysts
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-11-15 , DOI: 10.1002/app.50256
Mikhail A. Matsko ₁ , Marina I. Nikolaeva ₁ , Vladimir A. Zakharov _{1,

2}

Affiliation

Comparative data on the molecular weight distribution of polymers obtained by polymerization of ethylene, propylene and 1‐hexene, and copolymerization of ethylene with α‐olefins over the titanium‐magnesium catalysts (TMC) in the absence and presence of hydrogen are presented. In contrast to the ethylene polymerization, in the cases of propylene and 1‐hexene polymerization and copolymerization of ethylene with α‐olefins, the hydrogen addition is characterized by noticeable narrowing of the molecular weight distribution (MWD) due to lower contribution of the MWD component with high molecular weight. This result is an evidence of the increased reactivity of TMC active sites producing high molecular weight poly‐α‐olefins and copolymers of ethylene with α‐olefins in the chain transfer reaction with hydrogen. It is suggested that the increased reactivity of these sites in the transfer reaction with hydrogen appears after the 2,1‐addition of α‐olefin to the growing polymer chain.

中文翻译：

氢对乙烯和α-烯烃在负载钛镁催化剂上聚合得到的聚合物分子量分布的影响

给出了在不存在和存在氢的情况下，通过乙烯，丙烯和1-己烯的聚合以及乙烯与α-烯烃在钛-镁催化剂（TMC）上共聚获得的聚合物分子量分布的比较数据。与乙烯聚合相反，在丙烯和1-己烯聚合以及乙烯与α-烯烃共聚的情况下，由于MWD组分的贡献较低，加氢的特征是分子量分布（MWD）明显变窄具有高分子量。该结果表明，在与氢的链转移反应中，生产高分子量聚α-烯烃和乙烯与α-烯烃的共聚物的TMC活性位的反应性增加。

更新日期：2021-01-18

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