Methylaluminoxane (MAO) is known as a versatile activator of transition metal catalysts for coordination polymerization reactions, even though its precise structure and the origin of its activation properties have not been fully investigated. Considering that MAO exists as a counter anion that can interact with cationic metal species in a polymerization medium, the ability to impart structural modifications to MAO would provide a new direction for controlling the polymerization behavior. Here, the modification, the composition control, and a new preparation method of MAO will be summarized, as well as the application of modified MAO for the synthesis of stereoblock polydienes. Methylaluminoxane (MAO) activates various transition metal catalysts for coordination polymerization reactions and exists as a counter anion that can interact with cationic metal species in a polymerization medium. The structural modifications to MAO would therefore provide a new direction for controlling the polymerization behavior. In this review, our recent work about the modification, the composition control, and a new preparation method of MAO is summarized. The application of modified MAO for the synthesis of stereoblock polydienes is also described.

中文翻译：

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通过甲基铝氧烷 (MAO) 的改性精确控制配位聚合

甲基铝氧烷 (MAO) 被认为是用于配位聚合反应的过渡金属催化剂的通用活化剂，尽管其精确的结构及其活化性能的起源尚未得到充分研究。考虑到 MAO 作为抗衡阴离子存在，可以与聚合介质中的阳离子金属物质相互作用，赋予 MAO 结构修饰的能力将为控制聚合行为提供新的方向。在这里，将总结MAO的改性、组成控制和新的制备方法，以及改性MAO在立体嵌段聚二烯合成中的应用。甲基铝氧烷 (MAO) 可激活用于配位聚合反应的各种过渡金属催化剂，并作为抗衡阴离子存在，可与聚合介质中的阳离子金属物质相互作用。因此，对 MAO 的结构修饰将为控制聚合行为提供新的方向。在这篇综述中，我们总结了我们最近在 MAO 的改性、组成控制和新制备方法方面的工作。还描述了改性 MAO 在立体嵌段聚二烯合成中的应用。