Radiation Induced Reactions in Organized and Constrained Media

有组织和受限介质中的辐射诱发反应

• 批准号: 9509811
• 负责人: J. Kerry Thomas
• 金额: $ 9.5万
• 依托单位: University of Notre Dame
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-06-15 至 1997-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9509811&HistoricalAwards=false
• 关键词: Radiation; Induced; Reactions; Organized; Constrained

This award is made in the Organic Dynamics Program is support of Dr. J. Kerry Thomas' continuing research on radiation-induced reactions in organized and constrained media. Reactive intermediates will be generated by photochemical or radiation excitation of pyrene or other adsorbed species trapped in zeolites, silica, or a host of polymers such as polystyrene, polyethylene, polymethyl methacrylate, polyacrylonitrile, polyvinyl chloride and polyvinyl alcohol. Depending on the system selected, electrons (e-), holes (h+), cations, cation-radicals, anions, and/or free radicals will be generated, and their reactivity, motion, and energy-transfer properties monitored by their fluorescence, phosphorescence, and absorption spectra. These techniques will reveal unique trapping sites for ions in solid media and will monitor migration of energy and charge in excited polymers, to soluble probe molecules. The behavior of reactive intermediates in constrained media is relevant to heterogeneous catalysis in the case of zeolites and silica, and to understanding the mechanism of light and radiation- induced degradation of polymers. The action of high-energy radiation on polymers relates to the use of polymers in microelectronics and the use of radiation processing in nanolithography.

这个奖项是在有机动力学计划是支持博士J.克里托马斯'继续研究辐射诱导反应的组织和约束媒体。 反应性中间体将通过芘或捕获在沸石、二氧化硅或许多聚合物如聚苯乙烯、聚乙烯、聚甲基丙烯酸甲酯、聚丙烯腈、聚氯乙烯和聚乙烯醇中的其它吸附物质的光化学或辐射激发而产生。 取决于所选的系统，将产生电子（e-）、空穴（h+）、阳离子、阳离子自由基、阴离子和/或自由基，并且通过它们的荧光、磷光和吸收光谱监测它们的反应性、运动和能量转移性质。 这些技术将揭示固体介质中离子的独特捕获位点，并将监测激发聚合物中能量和电荷向可溶性探针分子的迁移。 活性中间体在受限介质中的行为与沸石和二氧化硅的多相催化有关，并且与理解聚合物的光和辐射诱导降解的机理有关。 高能辐射对聚合物的作用涉及聚合物在微电子学中的使用以及辐射处理在纳米光刻中的使用。