Surface Tension, Viscosity, and Density Measurements of Two Fluorocarbon Solvents, FC-43 and FC-78
Surface tension, viscosity, and density of fluorocarbon solvents as function of temperature
Coney, Thom A.↗
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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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Solvent effect in a sterically controlled synthesis of optically active alpha-amino acids from alpha-keto acids by hydrogenolytic asymmetric transamination.
Solvent effect in catalytic hydrogenation reaction of Schiff bases of alpha-keto acids with optically active alpha-alkylbenzylamine
Harada, K.↗
Effect of salts and organic solvents on the activity of Halobacterium cutirubrum catalase.
Salts and organic solvents effect on halophile Halobacterium cutirubrum catalase, noting enzyme activity inhibition by cation and anion
Lanyi, J. K.↗
Trimethylsilylation of amino acids. Effect of solvents on derivatization using BSTFA
Investigating effects of solvents on derivatization of trimethyl silyls from amino acids
Gehrke, C. W.↗
Aluminum chloride containing solvent systems as organic reactions media - A literature survey
Aluminum chloride containing solvent systems as organic reactions media - literature survey
Source record↗
A permeable rotating-wheel solvent extractor
Column-type device reported employs circular permeable structures of wire mesh screen for extracting solvents from systems with low density differences and low interfacial tensions. Rotating screen wheels of structure fasten to shaft; stationary screen structures are supported by circular bands connected by radial metal arms.
Kahn, D. R.↗
Quantitation of buried contamination by use of solvents
An investigation was made to determine (1) sporicidal properties of amine solvents that solubilize silicon resins, (2) recovery properties of a silicon potting compound (RTV 41) used in spacecraft, and (3) viability of spores during chemical curing of the potting compound. Results show that: (1) spores do remain viable during RTV 41 silicon potting chemical curing, and (2) spore recovery from cured silicon potting compound RTV 41 is very high when silicon rubber is dissolved in butylamine and series dilution with benzene prior to plate curing.
Pappas, S. P.↗
Quantitation of buried contamination by use of solvents
A method for determining the quantity of buried contamination using solvents is presented. A nonsporocidal method with which high spore recoveries are achievable from silicone coatings and potting compounds was developed. An extension of the method to silicon potting compound RTV 60 is reported. It is stated that spores remain viable during chemical curing of silicone potting compounds and more than ninety percent of the spore population is recoverable by amine dissolution and proper plating techniques.
Pappas, S. P.↗
Crystal growth in fused solvent systems
Research is reported on the growth of electronic ceramic single crystals from solution for the future growth of crystals in a microgravity environment. Work included growth from fused or glass solvents and aqueous solutions. Topics discussed include: crystal identification and selection; aqueous solution growth of triglycine sulphate (TGS); and characterization of TGS.
Ulrich, D. R.↗
Crystal growth in fused solvent systems
The successful nucleation of bismuth germanate, B12GeO20 on a high quality seed and the growth of regions of single crystals of the same orientation of the seed are reported. Lead germanate, Pb5Ge3O11 was also identified as a ferroelectric crystal with large electrooptic and nonlinear optic constants. Solvent criteria, solvent/development, and crystal growth are discussed, and recommendations for future studies are included.
Ulrich, D. R.↗
Automated solvent concentrator
Designed for automated drug identification system (AUDRI), device increases concentration by 100. Sample is first filtered, removing particulate contaminants and reducing water content of sample. Sample is extracted from filtered residue by specific solvent. Concentrator provides input material to analysis subsystem.
Griffith, J. S.↗
Diffusion in mixed solvents. III - The heat of mixing parameter and the Soret coefficient
New evidence is presented that for aqueous glycerol solutions, the Soret coefficient of glycerol, sigma sub 1 = D sub 1 T/D sub 1 (where D sub 1 T and D sub 1 are the thermal and self-diffusion coefficients, respectively, of glycerol in aqueous solutions), is an integral part of the heat of mixing parameter. Expressions are presented indicating the importance of the Soret coefficients to correlations for diffusion processes in glycerol water solvents.
Carapellucci, P. A.↗
EXXON donor solvent coal liquefaction process
A solvent coal liquefaction process to produce low-sulfur liquid products from a wide range of coals is described. An integrated program of laboratory and engineering research and development in conjunction with operation of a 250 T/D pilot plant is discussed.
Epperly, W. R.↗
Carbon, hydrogen and nitrogen isotopes in solvent-extractable organic matter from carbonaceous chondrites
CCl4 and CH3OH solvent extractions were performed on the Murray, Murchison, Orgueil and Renazzo carbonaceous chondrites. Delta-D values of +300-+500% are found in the case of the CH3OH-soluble organic matter. The combined C, H and N isotope data makes it unlikely that the CH3OH-soluble components are derivable from, or simply related to, the insoluble organic polymer found in the same meteorites. A relation between the event that formed hydrous minerals in CI1 and CM2 meteorites and the introduction of water- and methanol-soluble organic compounds is suggested. Organic matter soluble in CCl4 has no N, and delta-C-13 values are lower than for CH3OH-soluble phases. It is concluded that there either are large isotopic fractionations for carbon and hydrogen between different soluble organic phases, or the less polar components are partially of terrestrial origin.
Becker, R. H.↗
Kinetics of the reactions of the acid anhydrides with aromatic amines in aprotic solvents
Work has revealed that diamine derivatives of diphenylmethane (IV), diphenyl ether (V), benzophenone (IV), fluorene (VII), and fluorenone (VIII) polymerizations with pyromellitic dianhydride in DMA were dependent on the basicity of the amine compound. The correlation between the basicity of the amine and its reactivity with phthalic anhydride was determined. Basicity measurements were made by potentiometric titration of each amine in an acetonitrile-water solvent system, from which the pKa of the amine could be determined. Reactivity was defined in terms of the second order rate constant derived form spectrophotometric examination of the reaction between each amine and phthalic anhydride in DMA. This reaction was expected to proceed in either one (for a monoamine) or two (for a diamine) stages.
Sugg, E.↗
Solvent resistant thermoplastic aromatic poly(imidesulfone) and process for preparing same
A process for preparing a thermoplastic poly(imidesulfone) is disclosed. This resulting material has thermoplastic properties which are generally associated with polysulfones but not polyimides, and solvent resistance which is generally associated with polyimides but not polysulfones. This system is processable in the 250 to 350 C range for molding, adhesive and laminating applications. This unique thermoplastic poly(imidesulfone) is obtained by incorporating an aromatic sulfone moiety into the backbone of an aromatic linear polyimide by dissolving a quantity of a 3,3',4,4'-benzophenonetetracarboxylic dianhydride (BTDA) in a solution of 3,3'-diaminodiphenylsulfone and bis(2-methoxyethyl)ether, precipitating the reactant product in water, filtering and drying the recovered poly(amide-acid sulfone) and converting it to the poly(imidesulfone) by heating.
St.clair, T. L.↗
Development of an impact- and solvent-resistant thermoplastic composite matrix
Synthesis, moldability and chloroform, acetone and tricresyl phosphate resistance of 16 polymer compositions are described. These aliphatic heterocyclic polymers include polyimides, polybenzimidazoles, and N-arylenepolybenzimidazoles. A solution condensation (cresol) method to prepare imidized aliphaic polyimides is described. Two polyimides and one polybenzimidazole demonstrate no crazing or cracking during 500 hr exposure to the cited solvents under stress. Modification of one aliphatic polyimide with several aromatic amines suggests that m-phenylenediamine is singular in its behavior to improve the chloroform resistance of that class of polyimides.
Delano, C. B.↗
Solvent-Resistant, Thermally Stable Poly(Carbonate-Imides)
New polymers and copolymers based on polyimide backbone with carbonate moieties exhibit high temperature capability. Because of carbonate unit, many of these materials also exhibit high order or crystallinity. All of new imidecontaining polymers insensitive to acetone. New poly (carbonate-imide) exhibits significantly increased temperature resistance and shows less sensitivity to solvents than commercial polycarbonates.
St. Clair, T. L.↗