Mechanistic Investigations of Olefin Polymerizations and Selective Oligomerizations

烯烃聚合和选择性低聚的机理研究

• 批准号: 0601794
• 负责人: Lawrence Sita
• 金额: $ 45.3万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-03-01 至 2009-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0601794&HistoricalAwards=false
• 关键词: Mechanistic; Investigations; Olefin; Polymerizations; Selective

This award in the Inorganic, Bioinorganic and Organometallic Chemistry program supports research by Professor Lawrence B. Sita at the Univesity of Maryland at College Park to use a monocyclopentadienyl, amidinate ligand combination to impart significant kinetic stability to a variety of early transition metal alkyl complexes bearing beta-hydrogens. The primary objectives are to utilize neutral and cationic group 4 and 5 monocyclopentadienyl, monoamidinate metal alkyl complexes as a means to investigate mechanistic aspects of Ziegler-Natta polymerization and the highly selective trimerization of ethylene and alpha-olefins. This work seeks to determine how intra- and intermolecular dynamic processes can be harnessed to expand the structural and microstructural range of polyolefin materials that can be prepared through the Ziegler-Natta process. The work will test and validate a new paradigm for accessing a wide range of polyolefin microstructures through two-state bimolecular control that is based on degenerative-transfer living Ziegler-Natta polymerization. For the selective oligomerization of alpha-olefins, the proposed studies will contribute to an understanding of the factors that can serve to achieve both higher activities and selectivities in a new generation of catalysts. The broader impact of this work is the potential development of more efficient catalysts and new polyolefin materials that will be beneficial to both the world economy and society. The proposed work will provide an important vehicle by which future generations of undergraduates, graduate students, and postdoctoral researchers can be trained with the promotion of diversity in mind.

无机，生物无机和有机化学计划的这个奖项支持劳伦斯教授B的研究。Sita在College Park的马里兰州大学使用单环杂环化合物、脒基配体组合赋予各种带有β-氢的早期过渡金属烷基络合物显著的动力学稳定性。主要目标是利用中性和阳离子第4和5族单环戊二烯基、单脒基金属烷基配合物作为研究齐格勒-纳塔聚合以及乙烯和α-烯烃高选择性三聚反应机理的手段。 这项工作旨在确定如何利用分子内和分子间的动态过程来扩大可以通过齐格勒-纳塔工艺制备的聚烯烃材料的结构和微观结构范围。 这项工作将测试和验证一种新的范例，用于通过基于简并转移活性齐格勒-纳塔聚合的双态双分子控制来访问各种聚烯烃微结构。对于α-烯烃的选择性低聚，所提出的研究将有助于理解可以在新一代催化剂中实现更高活性和选择性的因素。这项工作的更广泛影响是更有效的催化剂和新的聚烯烃材料的潜在开发，这将有利于世界经济和社会。拟议中的工作将提供一个重要的工具，未来几代的本科生，研究生和博士后研究人员可以在头脑中促进多样性的培训。