A Self-Supporting Strategy for Gas-Phase and Slurry-Phase Ethylene Polymerization using Late-Transition-Metal Catalysts.,Angewandte Chemie International Edition

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A Self-Supporting Strategy for Gas-Phase and Slurry-Phase Ethylene Polymerization using Late-Transition-Metal Catalysts.
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2020-05-17 , DOI: 10.1002/anie.202004024
Shengyu Dai _{1,

2} , Changle Chen ₁

Affiliation

The polyolefin industry is dominated by gas‐phase and slurry‐phase polymerization using heterogeneous catalysts. In contrast, academic research is focused on homogeneous systems, especially for late‐transition‐metal catalysts. The heterogenization of homogeneous catalysts is a general strategy to provide catalyst solutions for existing industrial polyolefin synthesis. Herein, we report an alternative, potentially general strategy for using homogeneous late‐transition‐metal catalysts in gas‐phase and slurry‐phase polymerization. In this self‐supporting strategy, catalysts with moderate chain‐walking capabilities produced porous polymer supports during gas‐phase ethylene polymerization. Chain walking, in which the metal center can move up and down the polymer chain during polymerization, ensures that the metal center can travel along the polymer chain to find suitable sites for ethylene enchainment. This strategy enables simple heterogenization of catalysts on solid supports for slurry‐phase polymerization. Most importantly, various branched ultra‐high‐molecular‐weight polyethylenes can be prepared under various polymerization conditions with proper catalyst selection.

中文翻译：

使用后过渡金属催化剂的气相和淤浆相乙烯聚合的自支撑策略。

聚烯烃工业以使用多相催化剂的气相和淤浆相聚合为主导。相反，学术研究集中于均相系统，尤其是对于后过渡金属催化剂。均相催化剂的异质化是为现有的工业聚烯烃合成提供催化剂解决方案的一般策略。在本文中，我们报告了在气相和淤浆相聚合中使用均相晚过渡金属催化剂的另一种可能的通用策略。在这种自支撑策略中，具有适度链行走能力的催化剂在气相乙烯聚合过程中产生了多孔聚合物载体。链行走，其中金属中心可以在聚合过程中上下移动聚合物链，确保金属中心可以沿着聚合物链移动，找到合适的乙烯链位。这种策略可以使催化剂在固相载体上进行简单的杂化，以进行淤浆相聚合。最重要的是，在适当的催化剂选择下，可以在各种聚合条件下制备各种支化的超高分子量聚乙烯。

更新日期：2020-05-17

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