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: 0848293
• 负责人: Lawrence Sita
• 金额: $ 48.9万
• 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: 2009
• 资助国家: 美国
• 起止时间: 2009-03-01 至 2012-02-29
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0848293&HistoricalAwards=false
• 关键词: Mechanistic; Investigations; Olefin; Polymerizations; Selective

This Research award in the Inorganic, Bioinorganic and Organometallic Chemistry program supports work by Professor Lawrence R. Sita at the University of Maryland, College Park to investigate mechanisms for the coordination polymerization and selective oligomerization of 1-alkenes as mediated by molecularly-well-defined transition metal complexes. Novel dynamic and reversible bimolecular processes that are competitive with first-order chain-growth propagation are being identified and established as mechanistic control points by which the production of a near continuum of different polyolefin grades between two limiting materials can be accomplished using only a single catalyst. When combined with living coordination chain-transfer polymerization, it is anticipated that practical commercial volumes of these new polyolefin materials can be realized. The supported work further provides a critical vehicle through which outreach activities will be conducted to educate the general public regarding the current needs, limitations, and impact of the global polyolefins industry and related research. Students conducting the studies receive training in both fundamental and practical apsects of chemistry and will be well prepared to enter the workforce.Civilization and the quality of life as we know it is wholly dependent upon "plastic" materials prepared through the coordination polymerization of ethene, propene, and higher 1-alkene using catalysts that are largely discovered in empirical fashion. Detailed investigations of mechanistic processes that govern these catalysts can provide new and transformational strategies by which the range of plastic materials can be greatly increased while dramatically reducing the research and development cycle.

这个无机、生物无机和有机金属化学项目的研究奖支持马里兰大学帕克分校的Lawrence R. Sita教授的研究工作，研究由分子定义明确的过渡金属配合物介导的1-烯烃的配位聚合和选择性低聚化机制。与一阶链生长传播相竞争的新型动态可逆双分子过程正在被确定并建立为机械控制点，通过该控制点，两种极限材料之间几乎连续的不同聚烯烃等级的生产可以只用一种催化剂完成。当与活配位链转移聚合相结合时，这些新型聚烯烃材料有望实现实际的商业批量生产。所支持的工作进一步提供了一个重要的工具，通过它将开展外联活动，教育公众了解全球聚烯烃工业和有关研究的当前需求、限制和影响。进行研究的学生接受化学基础和实践方面的培训，为进入劳动力市场做好充分准备。正如我们所知，文明和生活质量完全依赖于乙烯、丙烯和1-烯烃配位聚合所制备的“塑料”材料，这些材料使用的催化剂大部分是在经验中发现的。对控制这些催化剂的机理过程的详细研究可以提供新的和转型的策略，通过这些策略，塑料材料的范围可以大大增加，同时大大缩短研究和开发周期。