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首页> 美国政府科技报告 >NMR Investigations of Liquid Propellant Systems Consisting of Alkyl- and Hydroxylammonium Nitrates. Part 2. Measurement of Carbon-13 Spin-Lattice Relaxation Times and Activation Energies for Molecular Motion in Model Liquid Propel
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NMR Investigations of Liquid Propellant Systems Consisting of Alkyl- and Hydroxylammonium Nitrates. Part 2. Measurement of Carbon-13 Spin-Lattice Relaxation Times and Activation Energies for Molecular Motion in Model Liquid Propel

机译：由烷基 - 和羟基硝酸铵组成的液体推进剂系统的NmR研究。第二部分：模型液体推进器中碳-13自旋 - 晶格弛豫时间和分子运动活化能的测量

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Carbon-13 spin-lattice relaxation times and nuclear Overhauser enhancements were measured in four alkylammonium nitrates, isopropyl-, triethanol-, trimeth trimethyl-, and n-butylammonium nitrates. The relaxation mechanism in these compounds was found to be predominantly by dipolar interactions with attached protons. The relaxation times increase with temperature, as expected, but were found to be essentially independent of concentrations. the alkylammonium ions give rise to consistently shorter relaxation times than the corresponding free alkylamines. Attempts are made to interpret these results in terms of ion pairing, ion clustering, molecular associations, and reorientations. The carbon-13 data lead to the conclusion that it is essential to study the nitrogen spin-lattice relaxations at the charge sites in the alkyl- and hydroxylammonium nitrates to get a better understanding of the motional dynamics, solvation effects, and ion clustering phenomena. Studies with nitrogen-15 labeled compounds are proposed.

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