The unextractable organic fraction of the Pueblito de Allende meteorite - Evidence for its indigenous nature
Pueblo de Allemande chondrite unexctractable carbon content using meteorite pyrolysis, obtaining aromatic hydrocarbons
Bauman, A. J.↗
SEARCH · Engineering Papers
Results for “Aromatics”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A new metalation complex for organic synthesis and polymerization reactions
Organometallic complex of N,N,N',N' tetramethyl ethylene diamine /TMEDA/ and lithium acts as metalation intermediate for controlled systhesis of aromatic organic compounds and polymer formation. Complex of TMEDA and lithium aids in preparation of various organic lithium compounds.
Hirshfield, S. M.↗
Coatings from copolymers of tetraphenoxysilane and p,p(1)-biphenol
Resultant resin from copolymers is highly crosslinked and completely aromatic. Procedure develops polyaryoxysilane structure in situ after the substrate has first been coated with a prepolymer. Resins are useful as protective coatings for metals, ceramics, glass, and other materials that accommodate relatively high curing temperatures.
Dunnavant, W. R.↗
Liquid-hydrogen/nuclear-radiation resistant seals
Seal employs aromatic heterocyclic polymer, polyquinoxaline, and features resin starved laminate consisting of alternate layers of woven glass fabric and polymer film. Design gives gasket a mechanical spring characteristic, eliminating cold flow and resulting in elastic recovery when gasket is unloaded.
Van Auken, R.↗
Azine polymers and process for preparing the same Patent
Synthesis of azine polymers for heat shields by azine-aromatic aldehyde reaction
Dalelio, G. F.↗
Radiation-induced preparation of antimony from solutions of antimony/III/ chloride in organic liquids
Electron irradiation induced separation of Sb from SbCl3 solutions in anhydrous alcohols, ethers, ketones, acids, ethers, and aromatic hydrocarbons
Marsik, S. J.↗
Carbon K emission spectra of some simple organic compounds
Organic compounds carbon K emission spectra, using light element X ray spectrometer for aliphatic, aromatic and partly ionic substances spectral analysis
Koster, A. S.↗
Water purification by reverse osmosis using heterocyclic polymer membranes
Pyrrone (polyimidazopyrrolone) polymers are a new class of thermally stable, radiation and chemical resistant aromatic-heterocyclic polymers featuring a greater chemical and mechanical durability than cellulose acetate.
Scott, H.↗
Composite seals for liquid hydrogen and nuclear radiation environments.
Description of plastic composite seals for service in a liquid-hydrogen and nuclear-radiation environment. The radiation-resistant aromatic heterocyclic class of polymers, including polyimide, polybenzimidazole, and polyquinoxaline, were evaluated for this application. The seal developed is based on a design involving a resin-starved laminate consisting of alternating layers of woven glass fabric and polymer film. This design imparts a mechanical spring characteristic to the seal, resulting in essentially complete elastic recovery when unloaded, and eliminates cold flow. Encapsulating techniques employing the polyquinoxaline polymer were developed which rendered the seal impervious to liquid hydrogen. The seals were tested before and after gamma irradiation up to 10 to the 10th ergs/g. Load/deflection and leakage tests were performed over a temperature range from -423 through +500 F.
Van Auken, R. L.↗
High-resolution mass spectrometry of nitrogenous compounds of the Colorado Green River formation oil shale.
Basic nitrogenous compounds isolated from extracts of Green River Formation oil shale were analyzed. The major homologous constituents found were the compositional types - namely, quinolines, tetrahydrequinolines with minor amounts of pyridines and indoles series and traces of more aromatized nitrogen compounds. These results are correlated with nitrogen compounds isolated from Green River Formation retort oil and are a survey of the unaltered nitrogen compounds indigeneous to the shale.
Simoneit, B. R.↗
Origin of organic matter in early solar system. VI - Catalytic synthesis of nitriles, nitrogen bases and porphyrin-like pigments.
A variety of nitrogen compounds have been synthesized by a static Fischer-Tropsch type reaction from CO, D2 and ND3, with Ni-Fe and Al2O3 catalysts. In this reaction, the gas is heated to 500-700 C for about 0.5 hr, and then cycled through lower temperatures (100-400 C) for 1-14 days. Products were analyzed by mass spectrometry in conjunction with gas chromatography and other chromatographic techniques. Compounds produced include alkyl cyanides, pyrroles, porphyrin-like compounds, guanidines, hydantoin, uracil and its derivatives, thymine, adenine, guanine, xanthine, melamine, as well as alkanes, alkenes and aromatic hydrocarbons. Such reactions may have been involved in the production of interstellar molecules, organic compounds in meteorites, and prebiotic organic matter on planets.
Hayatsu, R.↗
Organic matter in meteorites.
The meteorites known as carbonaceous chondrites contain organic compounds. These compounds were subjected to detailed analyses which indicate an abiotic origin. Results for the Murchison meteorite are compared with the Murray meteorite, another carbonaceous chondrite. A combined gas chromatography and mass spectroscopy technique was used for the analysis. Results showed a similarity between the two chondrites, in that at least 18 amino acids were present in both, and nine of these could be separated into the D and L forms, present in equal abundance for each amino acid. The amino acids in the Murchison meteorite were found to be optically inactive. At least 23 aromatic hydrocarbons were revealed in the Murchison meteorite by the combined chromatography-spectroscopy technique. The meteorite contained all possible isomers of amino acids with two and three carbon atoms, and all but two of the isomers of amino acids with four carbon atoms. This distribution suggests a random synthesis of the amino acids, rather than a selective synthesis by organisms.
Lawless, J. G.↗
Development and characterization of lubricants for use near nuclear reactors in space vehicles
The synthesis and evaluation program was conducted to develop wide-temperature range lubricants suitable for use in space vehicles particularly in the vicinity of nuclear reactors. Synthetic approaches resulted in nonpolymeric, large molecular weight materials, all based on some combination of siloxane and aromatic groups. Evaluation of these materials indicated that certain tetramethyl and hexamethyl disiloxanes containing phenyl thiophenyl substituents are extremely promising with respect to radiation stability, wide temperature range, good lubricity, oxidation resistance and additive acceptance. The synthesis of fluids is discussed, and the equipment and methods used in evaluation are described, some of which were designed to evaluate micro-quantities of the synthesized lubricants.
Robinson, G. L.↗
Odor intensity and characterization of jet exhaust and chemical analytical measurements
Odor and chemical analyses were carried out on the exhaust samples from a J-57 combustor can operated over a range of inlet conditions, and with several fuel types and nozzle modifications. The odor characteristics and total intensity of odor for each exhaust were determined over a range of dilutions to allow for a least squares determination of the intensity at 1,000 to 1 dilutions. Analytical measures included the concentration of total hydrocarbons and the concentrations of aromatic organic species and oxygenated organic species from collected samples which were taken concurrently. A correlation was found between the concentration of the odorous oxygenated fraction and the total intensity of aroma. Inlet operating conditions and nozzle modifications which increase the efficiency of combustion as measured by exhaust gas analyses reduce the odor intensity and the quantity of oxygenates in the exhaust. The type of fuel burned altered the intensity of odor in relation to the quantity of oxygenates produced and, in some instances, changed the odor character.
Kendall, D. A.↗
Thermally resistant polymers for fuel tank sealants
Imide-linked perfluoroalkylene ether polymers, that were developed for the high temperature fuel tank sealant application, are discussed. Modifications of polymer structure and properties were realized through use of a new aromatic dianhydride intermediate containing an ether-linked perfluoroalkylene segment. Tests of thermal, oxidative and hydrolytic stability, fuel resistance, and adhesion are discussed along with tensile strength and elongation results. Efforts to effect a low temperature condensation of amic acid prepolymer to form imide links inside are described.
Webster, J. A.↗
Preparation of alkali metal dispersions
A method is described for producing alkali metal dispersions of high purity. The dispersions are prepared by varying the equilibrium solubility of the alkali metal in a suitable organic solvent in the presence of aromatic hydrocarbons. The equilibrium variation is produced by temperature change. The size of the particles is controlled by controlling the rate of temperature change.
Rembaum, A.↗
Polymerizable disilanols having in-chain perfluoroalkyl groups
Disilanols containing in-chain perfluoroalkyl and aromatic groups and the process by which they were prepared are discussed. The disilanols, when reacted with a diaminosilane and cured, produce polymeric material resistant to hydrocarbon fuels and stable at elevated temperatures.
Patterson, W. J.↗
Odor intensity and characterization studies of exhaust from a turbojet engine combustor
Sensory odor tests of the exhaust from a turbojet combustor operating at simulated idle conditions were made by a human panel sniffing diluted exhaust gas. Simultaneously, samples of undiluted exhaust gas were collected on adsorbent substrates, subsequently removed by solvent flushing, and analyzed chemically by liquid chromatographic methods. The concentrations of the principal malodorous species, the aromatic (unburned fuel-related) and the oxygenated (partially burned fuel) fractions, as determined chromatographically, correlated well with the intensity of the odor as determined by sniffing. Odor intensity increased as combustion efficiency decreased. Combustor modifications which increased combustion efficiency decreased odor intensity.
Butze, H. F.↗