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in subjects: "Organic Oxygen Compounds"

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Cryogenic compressive properties of basic epoxy resin systems

The compressive properties of short cylindrical samples of many different epoxy resin systems have been measured at ambient temperature and at 77/sup 0/K. These are pure resin systems of known chemistry, without the inorganic fillers or fibrous reinforcements needed in final cryogenic systems. Of course, chemically incorporated modifiers such as flexibilizing resins have been included. This data should make possible inferences about cryogenic properties from molecular structures and provide spe… more

Date: September 1, 1985

Creator: Markley, F.W.; Hoffman, J.A. & Muniz, D.P.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Composite-rim flywheel design

The design of a flywheel which incorporates a circumferentially wound rim is described. The design required the selection of materials and configuration for rim and hub, and a means of attaching the rim to the hub. The method used to fabricate prototype flywheels of this design is discussed.

Date: January 1, 1977

Creator: Reedy, E.D. Jr.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Fundamental studies of catalytic processing of synthetic liquids

This project revolves around understanding the fundamental processes involved in the catalytic removal of harmful oxygenated organics present in coal liquids. We will model the complex type of sulfided Mo catalyst proposed for these reactions with a simple single crystal surfaces that display a controlled range and number of reaction sites and can be extensively characterized by surface science techniques.

Date: April 10, 1990

Creator: Watson, P. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

System for vacuum pouring of epoxy tensile and impact specimens with a study of the behavior of these specimens at 77 K and 293 K

The purpose of the investigation was to establish a suitable technique for vacuum pouring of epoxy test specimens and to study the behavior of these specimens at 77 K and 293 K. A series of tensile and impact tests was conducted using specimens made from the following resins: Epon 828, Epon 871, and Epon curing agent Z. These materials are of general interest to designers of magnets for cryogenic service. Tests of the specimens were carried out at 77 K and 293 K. The 77 K data indicate that ten… more

Date: March 31, 1978

Creator: Fitzpatrick, C.M. & Stoddart, W.C.T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Studies of the surface structures of molecular crystals and of adsorbed molecular monolayers on the (111) crystal faces of platinum and silver by low-energy electron diffraction

The structures of molecular crystal surfaces were investigated for the first time by the use of low-energy electron diffraction (LEED). The experimental results from a variety of molecular crystals were examined and compared as a first step towards understanding the properties of these surfaces on a microscopic level. The method of sample preparation employed, vapor deposition onto metal single-crystal substrates at low temperatures in ultrahigh vacuum, allowed concurrent study of the structure… more

Date: January 1, 1977

Creator: Firment, L.E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Test methods for the dynamic mechanical properties of polymeric materials. Final report

Various test geometries and procedures for the dynamic mechanical analysis of polymers employing a mechanical spectrometer have been evaluated. The methods and materials included in this work are forced torsional pendulum testing of Kevlar/epoxy laminates and rigid urethane foams, oscillatory parallel plate testing to determine the kinetics of the cure of VCE with Hylene MP, oscillatory compressive testing of B-3223 cellular silicone, and oscillatory tensile testing of Silastic E and single Kev… more

Date: June 1, 1980

Creator: Baker, G.K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

GC/MS characterization of condensable tars in the output stream of a stirred fixed-bed gasifier

The output stream of the stirred fixed-bed gasifier at the Morgantown Energy Technology Center was sampled for total entrained material. A major portion of the entrained material, in addition to particles, is condensable tar that is subsequently removed from the process gas by wet scrubbing. Characterization of the entrained materials, specifically the tar, is important to establish contaminant levels and to evaluate performance of downstream cleanup units. Samples of tars were collected from t… more

Date: December 1, 1981

Creator: Lamey, S. C.; McCaskill, K. B. & Smith, R. R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Pretreatment of Kapton-coated cable for epoxy adhesion

Preliminary testing of a new system for protecting bonded strain gages that will be attached to the MFTF magnets indicated falling electrical resistance to ground, attributed to the infiltration of moisture. The most likely infiltration route seemed to be along the Kapton lead cable, which has an outer surface of FEP fluorocarbon resin. Samples of the cable were pretreated with a fluorocarbon etchant, Tetra-Etch, for periods of 10, 25, and 40 s at room temperature, followed by rinsing with demi… more

Date: January 9, 1984

Creator: Carley, J. F.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Computer programs, to determine credible regions for Weibull distribution

Computer software for analyzing life test data with a Weibull distribution is given. The programs calculate and plot the 95, 90, 50 and 5% highest probability density contours and the maximum likelihood estimators on the same frame for all sets of data. They also calculate the maximum likelihood estimator of mean life and conservative 95, 90, 50 and 5% credible intervals on mean life. The programs are used to analyze data on the lifetimes of Kevlar/Epoxy spherical vessels and the results are gi… more

Date: unknown

Creator: Agrawal, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Fireset Materials Aging Study

A thermally-accelerated aging study of 10 selected organic materials used in a fireset has been conducted. The study included both quantitative and qualitative gas analyses as well as the measurement of physical properties before and after accelerated aging. The test plan involved single material aging, as well as pairs and larger groups to look for synergistic interactions. The material types tested were epoxies, polyurethanes, polysulfides, silicones, phenolics, polyolefins, and diallyl phtha… more

Date: July 1, 1982

Creator: Smith, H. M.; Arnold, C. & Bailey, M. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Energies of organic compounds. Technical progress report. [Ketals, orthoesters, norbonyl ketals]

Two automated reaction calorimetry systems were built and tested. The first made use of a quartz thermometer probe as the temperature measuring element. The second was constructed using a thermister which was part of a Wheatstone bridge. The off-balance voltage from the bridge was measured using the 6 1/2 digit digital voltmeter, and transferred to the microprocessor. The one disadvantage of the first system is the relatively large size of the quartz sensor. The calorimeter systems were used to… more

Date: February 19, 1981

Creator: Wiberg, K. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The thermodynamic properties of benzothiazole and benzoxazole

This research program, funded by the Department of Energy, Office of Fossil Energy, Advanced Extraction and Process Technology, provides accurate experimental thermochemical and thermophysical properties for key'' organic diheteroatom-containing compounds present in heavy petroleum feedstocks, and applies the experimental information to thermodynamic analyses of key hydrodesulfurization, hydrodenitrogenation, and hydrodeoxygenation reaction networks. Thermodynamic analyses, based on accurate in… more

Date: August 1, 1991

Creator: Steele, W. V.; Chirico, R. D.; Knipmeyer, S. E. & Nguyen, A.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Radiation effects on insulators for superconducting magnets

In order to determine the radiation stability of electrical insulation that could be used in a superconducting magnet for containment of the plasma in a fusion energy device, 55 specimens of eight types of organic insulation were irradiated to a dose of about 2 x 10/sup 8/ R (2 x 10/sup 6/ J/Kg) at a temperature of 4.8 K in the Low-Temperature Irradiation Facility in the Bulk Shielding Reactor at Oak Ridge National Laboratory. Four of the specimens were monitored for changes in electrical resis… more

Date: January 1, 1978

Creator: Kernohan, R.H.; Coltman, R.R. Jr. & Long, C.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Photochemistry of psoralen-DNA adducts, biological effects of psoralen-DNA adducts, applications of psoralen-DNA photochemistry

This thesis consists of three main parts and totally eight chapters. In Part I, The author will present studies on the photochemistry of psoralen-DNA adducts, specifically, the wavelength dependencies for the photoreversals of thymidine-HMT (4'-hydroxymethyl-4, 5', 8-trimenthylpsoralen) monoadducts and diadduct and the same adducts incorporated in DNA helices and the wavelength dependecies for the photocrossslinking of thymidine-HMT monoadducts in double-stranded helices. In Part II, The author… more

Date: March 1, 1988

Creator: Shi, Yun-bo

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Energies of organic compounds. [Polyoxygenated methanes, ketals, orthoesters, cyclopropane derivatives]

Automatic reaction calorimeters were developed. Enthalpies of hydration or hydrolysis were determined for polyoxygenated methanes, ketals, acetals, orthoesters, and alkenes. Trifluoroacetolysis of alkenes was carried out. Enthalpies of acetolysis and combustion of cyclopropane derivatives were also determined. Molecular mechanics calculations were carried out for ketones and ketals. Charge distribution in organic compounds were studied. 31 references. (DLC)

Date: July 1, 1980

Creator: Wiberg, K. B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Alternate materials of construction for geothermal applications. Progress report No. 13, April--June 1977

A program to determine if non-metallic materials such as polymers, concrete polymer composites, and refractory cements can be utilized as materials of construction in geothermal processes is in progress. To date, several high temperature polymer concrete systems have been formulated, laboratory and field tests performed in brine, flashing brine, and steam at temperatures up to 260/sup 0/C, and economic studies started. Laboratory data for exposure times greater than 2 years are available. Resul… more

Date: June 1, 1977

Creator: Steinberg, M. & Kukacka, L. E.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Mechanical characterization of selected adhesives and bulk materials at liquid nitrogen and room temperatures

This paper presents the results of a series of mechanical tests on selected adhesives and bulk materials. The materials tested are of general interest to designers of magnets for cryogenic service and include several epoxies, a varnish, a B-stage glass cloth, insulation papers, and commercially available fiber-reinforced composites. These tests were performed at room temperature (293 K) and at liquid nitrogen temperature (77 K). The tests include both simple tension tests and lap shear tests wi… more

Date: January 1, 1977

Creator: Fitzpatrick, C.M. & Stoddart, W.C.T.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Time-dependent properties of fiber composites for energy-storage flywheels

Time-dependent deformation and time-dependent strength are being characterized for several candidate polymeric composites for flywheels. This presentation highlights the motivation and the philosophy of the characterization adopted by the authors in establishing the ongoing programs at LLL. This overview is intended to provide a basis for inferring the type of enginering data being generated for different aspects of flywheel design. The details of these data can be obtained from the published r… more

Date: October 25, 1977

Creator: Wu, E.M. & Penn, L.S.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

/sup 1/H, /sup 19/F and /sup 11/B nuclear magnetic resonance characterization of BF/sub 3/:amine catalysts used in the cure of C fiber-epoxy prepregs

The chemical composition of commercial BF/sub 3/:amine complexes are variable and contain BF/sub 4//sup -/ and BF/sub 3/(OH)/sup -/ salts together with other unidentified highly reactive species. The BF/sub 3/:amine complexes, which are susceptible to hydrolysis, also partially convert to the BF/sub 4//sup -/ salt (i.e. BF/sub 4//sup -/NH/sub 3//sup +/C/sub 2/H/sub 5/) upon heating. This salt formation is accelerated in dimethyl sulfoxide solution and in the presence of the epoxides that are pr… more

Date: December 1, 1983

Creator: Happe, J.A.; Morgan, R.J. & Walkup, C.M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Prediction of long-term failure in Kevlar 49 composites

Creep rupture data in Kevlar 49 epoxy usually exhibit considerable scatter: the coefficient of variation (CV) about the mean failure time at a given stress exceeds 100%. Quasi-static strength data, in contrast, shows little scatter: <4% CV for pressure vessels and <10% for impregnated strands. In this paper analysis of existing creep rupture data on Kevlar epoxy vessels at four storage pressures has produced an interesting and useful result. It was found that a significant portion of the scatte… more

Date: January 1, 1982

Creator: Gerstle, F.P. Jr.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Molecular beams studies of the energetics and dynamics of elementary chemical reactions

Quantum mechanical effects on the angular distribution of HF products from the F + H/sub 2/ reaction were studied using crossed atomic and molecular beams with a rotatable mass spectrometer detector and time-of-flight velocity analysis. Measurement of the singlet-triplet splitting of CH/sub 2/ from the recoil velocities of fragments from ketene photodissociation in a molecular beam is also reported. Partial center-of-mass angular distributions, and velocity flux contour maps have been derived f… more

Date: May 1, 1982

Creator: Hayden, C.C.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Coal surface control for advanced fine coal flotation

The primary objective in the scope of this research project is to develop advanced flotation methods for coal cleaning in order to achieve near total pyritic-sulfur removal at 90% Btu recovery, using coal samples procured from three major US coal seams. Concomitantly, the ash content of these coals is to be reduced to 6% or less. Investigation of mechanisms for the control of coal and pyrite surfaces prior to fine coal flotation is the main aspect of the project objectives. The results of this … more

Date: July 30, 1991

Creator: Fuerstenau, D. W.; Sastry, K. V. S.; Hanson, J. S.; Diao, J.; De, A.; Sotillo, F. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Kevlar 49-Epoxy insulator

Kevlar 49-Epoxy composite structural insulators were fabricated from two and three dimensionally reinforced material. The insulator configuration was that of a cylindrical cup having both external and internal threads. Electrical and mechanical property data was obtained for test samples of both materials. Relatively little difference in electrical properties was obtained for the two materials; however, the mechanical properties varied markedly. The transverse strength of the two dimensionally … more

Date: January 1, 1978

Creator: Ericksen, R.H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Deploymerization of coal by direct solvent attack. Semi-annual report, April 1, 1983-August 31, 1983

The depolymerization of Illinois No. 6 coal by a series of solvents having different basecities (pK/sub a/) and nucleophilicities (Swain-Scott nu values) showed no dependence on either the basicity of nucleophilicity of the solvents. As expected, the conversion decreases as the temperature of the reaction is reduced, but the lower the reaction temperature, the higher the percentage of amine incorporation becomes in the products. 5 tables.

Date: September 15, 1983

Creator: Larsen, J. W. & Mohammadi, M.

Item Type: Report

Partner: UNT Libraries Government Documents Department