New Polymerization Reactions

这个项目是关于新的化学反应的发展，以重复形成sp3-sp3碳-碳键。这些反应的产物，碳骨架聚合物，构成了一些已知的最重要的合成材料。传统的聚合物合成方法包括烯烃聚合。该项目将研究用刘易斯酸性催化剂/引发剂聚合乙烷和重氮烷烃单体的新反应。这些反应一次一个碳地构建碳骨架，并提供了对分子量和多分散性的特殊控制。新的聚合物拓扑结构，不容易通过传统的烯烃聚合，也将研究使用这些新的反应。通过这个奖项，有机和大分子化学项目支持加州大学欧文分校化学系的Kenneth J. Shea教授的研究。Shea教授的研究主要集中在合成和机械有机化学、跨聚合物、功能材料和催化方面。他的研究引起了聚合物科学家的广泛兴趣，可以建立结构/性能关系，合成聚合物增容剂和共混剂，作为分子量校准的标准，以及作为商品塑料的表面改性剂。他的方法也可用于合成聚合物，以测试聚合物物理的基本概念，如拓扑结构对聚合物扩散、熔体行为、结晶和溶液粘度的影响。此外，由于许多烯烃不容易聚合，这些替代的合成方法可以作为一个全新的物质和性质的入口。与主要聚乙烯生产商的合作已经建立，这将导致这些材料的特性的广泛表征。

This project is concerned with the development of new chemical reactions for the repetitive formation of sp3-sp3 carbon-carbon bonds. The products of these reactions, carbon backbone polymers, comprise some of the most important synthetic materials known. Traditional methods for polymer synthesis involve polymerization of alkenes. The project will study new reactions involving the polymerization of ylides and diazoalkane monomers with Lewis acidic catalyst/initiators. These reactions build the carbon backbone one carbon at a time and provide exceptional control over molecular weight and polydispersity. Novel polymer topologies, not readily available by conventional olefin polymerization, will also be studied using these new reactions. With this award, the Organic and Macromolecular Chemistry Program is supporting the research of Professor Kenneth J. Shea of the Department of Chemistry at the University of California, Irvine. Professor Shea's research efforts revolve around synthetic and mechanistic organic chemistry and span polymers, functional materials and catalysis. His research is of broad interest to polymer scientists for establishing structure/property relationships, for synthesizing polymer compatibilizing and blending agents, as standards for molecular weight calibration, and as surface modifiers for commodity plastics. His method can also be used to synthesize polymers for testing fundamental concepts of polymer physics such as the influence of topology on polymer diffusion, melt behavior, crystallization and solution viscosity. In addition, since many olefins do not readily polymerize, these alternative synthetic methods can serve as an entry to completely new substances and properties. Collaborations with the major producers of polyethylene have been established which will lead to extensive characterization of the properties of these materials.