Alternative Resting States of Olefin-Polymersization Catalysts - Detection of Relevant Reaction Channels by UV/vis, EPR- and NMR-Spectroscopic Methods

制备新型聚烯烃材料的关键是通过催化剂调整其微观结构-从而调整聚合物性能。新型催化剂提供了例如获得嵌段共聚物的途径。然而，对于单个体系理解相当少的问题是在实际反应条件下，即在大量单体存在下实际存在的不同金属物质的性质。该项目旨在通过调整现有的光谱方法--主要是UV/维斯、EPR和NMR技术--实现这一目标，对选定的基于烯烃和后茂金属的烯烃聚合催化剂中的物种分布（例如静止状态）进行原位鉴定和量化。Mecking教授为特别适合此类研究的新型活性和稳定的后茂金属聚合催化剂贡献了专业知识。Brintzinger教授为该项目带来了他在茂金属反应化学方面的经验，Möller教授将为其方法学方面做出贡献。我们的俄罗斯合作伙伴在Boreskov催化研究所与Brintzinger教授小组的合作，在过去几年中导致了一系列联合出版物，将进一步发展并应用于后茂金属体系。

Key for the preparation of new polyolefin materials is tailoring of their microstructure – and thus of polymer properties – via the catalyst. Novel catalysts provide access e.g. to block copolymers. An issue which is rather poorly understood for individual systems, however, is the nature of the different metal species actually present under realistic reaction conditions, i.e. in the presence of large amounts of monomer. The project aims at in-situ identification and quantification of species distribution, e.g. of resting states, in selected metalloceneand post-metallocene-based olefin-polymerization catalysts by adapting existing spectroscopic methods – mainly UV/vis, EPR and NMR techniques – toward this goal. Prof. Mecking contributes expertise for a novel living and stable post-metallocene polymerization catalyst particularly suited for such studies. Prof. Brintzinger brings to this project his experience in metallocene reaction chemistry, and Prof. Möller will contribute to its methodological side. Cooperation of our Russian partners at the Boreskov Institute of Catalysis with the group of Prof. Brintzinger, which has led to a series of joint publications during the last years, is to be further developed and applied to post-metallocene systems.