Polymers: Stereochemical Studies and Chiral Materials

聚合物：立体化学研究和手性材料

• 批准号: 9975471
• 负责人: Mark Green
• 金额: $ 52.5万
• 依托单位: Polytechnic University of New York
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-06-01 至 2004-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9975471&HistoricalAwards=false
• 关键词: Polymers; Stereochemical; Studies; Chiral; Materials

This award is made to Polytechnic University in support of the research of Prof. Mark M. Green by the Advanced Materials Program in the Chemistry Division and the Polymer Program in the Division of Materials Research. The objective of the research is to develop stereochemical approaches for elucidating the nature of polymers and the materials states they form. The material states investigated will be single polymer chains in solution, lyotrophic liquid crystals from concentrated solutions, thermally reversible gels, and the amorphous glassy state. Single chain studies will show how polymers amplify chirality. Liquid crystal studies will probe the mechanism of how nematic states are converted to cholesteric states. Studies with thermally reversible gels will define the responsible aggregate states unique to stiff chains and how to predict and control polymer properties. In all cases, chiral pendant groups attached to the polymers will be used as probes to influence and modify polymer properties.The study of the role of chirality on polymer properties will have both fundamental and technological impact. Chiral amplification in polymers can provide a basis for optical switching, how conversion of liquid crystals between the nematic and twisted nematic states relates to LC display devices, and how the effect of temperature on polymer chirality can be used to optically measure temperature. More broadly, chiral amplification may provide clues to the relationship between circularly polarized light in outer space and the origin of optical activity on earth.

该奖项授予理工大学，以支持化学部先进材料计划和材料研究部聚合物计划对Mark M.Green教授的研究。这项研究的目的是开发立体化学方法来阐明聚合物的性质和它们形成的材料状态。所研究的物质状态将是溶液中的单一聚合物链、浓溶液中的溶致液晶、热可逆凝胶和无定形玻璃态。单链研究将显示聚合物如何放大手性。液晶研究将探索向列态如何转变为胆汁态的机制。对热可逆凝胶的研究将确定刚性链特有的可靠聚集态，以及如何预测和控制聚合物性能。在所有情况下，连接在聚合物上的手性侧基将被用作影响和修饰聚合物性能的探针。手性对聚合物性能的影响的研究将具有基础性和技术性的影响。聚合物中的手性放大可以为光学开关提供基础，液晶在向列态和扭曲向列态之间的转换如何与液晶显示器件有关，以及如何利用温度对聚合物手性的影响来光学测量温度。更广泛地说，手性放大可能提供外层空间圆偏振光与地球光学活动起源之间的关系的线索。