聚合
催化作用
乙烯
化学
单体
摩尔质量
活化能
稀释剂
阳离子聚合
高分子化学
癸烷
铝
氯化物
无机化学
物理化学
有机化学
聚合物
作者
David T. Lynch,Moses O. Jejelowo,Sieghard E. Wanke
标识
DOI:10.1002/cjce.5450690308
摘要
Abstract The influence of different aluminum alkyls (diethylaluminum chloride, triethylaluminum, triisobutylaluminum, tri‐n‐hexylaluminum, tri‐n‐octylaluminum and isoprenylaluminum) on the ethylene polymerization activity of a laboratory prepared high‐activity SiO 2 /MgCl 2 ‐supported TiCl 4 catalyst has been investigated. A slurry reactor (decane diluent) was used for measuring rates of polymerization. The average molar mass, the breadth of the molar mass distribution, the polymerization activity, and the shapes of the activity‐time profiles, were strongly dependent on the nature of the aluminum alkyl. For several of the cocatalysts used, the catalytic activity approached a constant value after a certain amount of time under reaction conditions. In this constant activity region, a first‐order dependence of the polymerization rate on the monomer concentration was found for all of the systems examined. However, the activation energy of the polymerization reaction was found to depend strongly on the type of cocatalyst which was used.
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