Radiation Induced Reactions in Organized and Constrained Media

该奖项是在有机动力学项目中颁发的，以支持J. Kerry Thomas博士对有组织和受限介质中辐射诱导反应的持续研究。活性中间体将通过光化学或辐射激发产生芘或其他吸附在沸石、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）中的物质。根据所选择的系统，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，并通过其荧光、磷光和吸收光谱监测其反应性、运动和能量转移特性。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非均相催化有关，并有助于理解光和辐射诱导聚合物降解的机制。高能辐射对聚合物的作用涉及到聚合物在微电子学中的应用以及辐射加工在纳米光刻中的应用。

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.