Abstract

A series of previously synthesized homoleptic and heteroleptic complexes of zirconium and hafnium were used for the polymerization of ethylene. Upon activation with methylaluminoxane, all the complexes serve as pre-catalysts for the polymerization of ethylene. The effects of polymerization time, reaction temperature, solvents, and methylaluminoxane to catalyst ratio on the polyethylene yield were investigated. The catalyst activity depends on the coordination environment of the metals. The highest activity obtained was 5.91 × 10⁴ g of polyethylene/[(mol of catalyst) h] under the optimized conditions of hexane as a solvent, reaction time and temperature of 30 min and 50°C respectively, and MAO to catalyst ratio of 1000 : 1.

中文翻译：

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带有Salen配体的锆和Ha络合物用于乙烯的聚合

摘要

一系列先前合成的锆和ha的均化和杂化络合物用于乙烯的聚合。在用甲基铝氧烷活化后，所有配合物均作为乙烯聚合的前催化剂。研究了聚合时间，反应温度，溶剂以及甲基铝氧烷与催化剂的比例对聚乙烯收率的影响。催化剂活性取决于金属的配位环境。在己烷作为溶剂，反应时间和温度分别为30分钟和50°C，MAO与催化剂比为30的最佳条件下，获得的最高活性为5.91×10 ⁴ g聚乙烯/ [（催化剂的摩尔数）h]。 1000：1。