Mechanistic Investigation of Amidinate-Based Catalysts for Living Ziegler-Natta Polymerization

这个无机、生物无机和有机金属化学项目的奖项支持马里兰大学帕克分校的Lawrence Sita对酰胺基烯烃聚合催化剂的研究。如环戊二烯基二甲基乙酰氨基酸锆等化合物被硼酸盐共催化剂活化，以提供一种促进烯烃立体特异性活性齐格勒-纳塔聚合和非共轭二烯活性环聚合的活性物质。设计、合成和评价新的催化剂。动力学分析将探讨详细的机制，包括识别控制生长的聚合物链的立体化学的因素。聚烯烃是一大类商业塑料，包括聚乙烯和聚丙烯。嵌段共聚物通常表现出理想的性能，如弹性、结晶性、热塑性和溶解度。这些新型特种塑料用于包装、电子和纺织工业。茂金属和酰胺类催化剂为合成新的有用的聚烯烃提供了途径。

This award in the Inorganic, Bioinorganic and Organometallic Chemistry Program supports Lawrence Sita, University of Maryland College Park, for work on amidinate-based olefin polymerization catalysts. Compounds such as cyclopentadienyl dimethyl zirconium acetamidinate are activated with borate cocatalysts to provide an active species that promotes the stereospecific living Ziegler-Natta polymerization of olefins and the living cyclopolymerization of non-conjugated dienes. New catalysts will be designed, synthesized and evaluated. Kinetic analyses will probe the detailed mechanism, including identification of factors that control the stereochemistry of the growing polymer chain. Polyolefins are a large class of commercial plastics that includes polyethylene and polypropylene. Block copolymers often show desirable properties such as elasticity, crystallinity, thermoplasticity and solubility. These new specialty plastics are used in the packaging, electronics and textile industries. Metallocene and amidinate catalysts provide routes into new and useful polyolefins.