Mechanistic Investigations of Olefin Polymerizations and Selective Oligomerizations

烯烃聚合和选择性低聚的机理研究

基本信息

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

项目摘要

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.

该研究奖在马里兰州大学公园的劳伦斯·R·西塔（Lawrence R. 与一阶链生长传播具有竞争力的新型动态和可逆分子过程正在被鉴定并确定为机械控制点，通过这种控制点，只能使用单个催化剂来完成两种限制材料之间不同聚烯级等级的几乎连续体的生产。当与生活协调链转移聚合结合使用时，可以预计可以实现这些新聚苯乙烯材料的实际商业量。受支持的工作进一步提供了一项关键的工具，通过该工具将进行外展活动，以教育公众有关全球聚集线行业和相关研究的当前需求，局限性和影响的教育。进行研究的学生接受了化学的基本和实用性的培训，并准备进入劳动力。我们知道，通过使用乙烯，丙烯和更高的1-烷烃的催化剂来依赖“塑料”材料，从而完全依赖于“塑料”材料。对控制这些催化剂的机械过程的详细研究可以提供新的转型策略，通过这些策略可以大大增加塑料材料的范围，同时大大减少研究和开发周期。