Radiation Induced Reactions in Organized and Constrained Media

该奖项由有机动力学计划颁发，是对J.Kerry Thomas博士在有组织和受限制的媒体中辐射诱导反应的持续研究的支持。活性中间体将通过光化学或辐射激发，或其他吸附在沸石、二氧化硅或大量聚合物(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)中的吸附物种产生。根据所选择的体系，将产生电子(e-)、空穴(h+)、阳离子、阳离子、阴离子和/或自由基，并通过它们的荧光、磷光和吸收光谱来监测它们的反应性、运动和能量转移特性。这些技术将揭示离子在固体介质中的独特捕获位置，并将监测激发聚合物中的能量和电荷向可溶探针分子的迁移。反应中间体在受限介质中的行为与沸石和二氧化硅中的多相催化有关，并与理解光和辐射诱导聚合物降解的机理有关。高能辐射对聚合物的作用与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有关。

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.