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in subjects: "360403 -- Materials-- Polymers & Plastics-- Mechanical Properties-- -1987"  
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Dynamic shear behavior of alumina-filled epoxy

Description: Thin-walled tubular specimens of alumina-filled epoxy were loaded in torsion at a strain rate of approximately 10/sup 3/ s/sup -1/ using a stored-torque Kolsky bar. In addition to measuring the time resolved shear stress and shear strain in the specimen, the axial stress generated by the dilation of the material during shear deformation was also obtained as a function of time. Tests were conducted at room temperature and at -60/sup 0/C. At room temperature, a moderate amount of plastic deformat… more
Date: March 1, 1982
Creator: Costin, L.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Polymers in solar technologies: an R and D strategy

Description: The use of polymers can increase the cost-effectiveness of solar technologies. The potential impact of polymers may be enhanced earlier if R and D is carried out according to a plan. The purpose of this plan is to present a five-year program consisting of 20 tasks categorized into six major problem areas: response to combined stresses; photochemistry; permeability/adhesion; surface properties; mechanical properties; and development of polymers. A budget required for each task is estimated and s… more
Date: July 1, 1980
Creator: Carroll, W.F. & Schissel, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Coaxial extrusion conversion concept for polymeric flat plate solar collectors. Final technical report, September 30, 1978-December 31, 1979

Description: This study investigated materials and processes for fundamental improvements in flat-plate solar collector cost and performance. The goal was to develop a process for direct conversion of inexpensive raw materials into a completed solar collector unit, without labor intensive assembly operations. It was thought that materials carefully matched to the process and end-use environment would substantially reduce collector costs, as compared to conventional industry practice. The project studied the… more
Date: January 1, 1980
Creator: Rhodes, R. O.; Chapman, N. J.; Chao, K. C. & Sorenson, K. F.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

High load bearing flexible urethane foams

Description: The load bearing properties of flexible urethane foam as a function of the formulation variables were investigated. Varying levels of a polystyrene-acrylonitrile-polyol were added to the foam systems to increase the load-bearing capabilities of the resultant materials. The formulation water level and fluorocarbon blowing agent level were also varied to provide flexible urethane foams covering a wide range of density and compressive properties. The compression set/compression deflection properti… more
Date: November 1, 1977
Creator: Parker, B. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Shelf life determination of an epoxy resin by accelerated aging

Description: The objectives of the study reported were to first define the rate and mode of degradation of an epoxy resin at two storage conditions, 4.4/sup 0/C and 25/sup 0/C, by means of a thermally accelerated aging experiment. Then, samples which had been aged the equivalent of at least 10 years at each storage condition would be tested for conformance to the material specifications. The study's results demonstrate that the commercial resin could be acquired and stored for the required 10 to 11 years wi… more
Date: November 1, 1983
Creator: Smith, H.M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Special problems in nuclear instrumentation. Final report for period ending July 31, 1978

Description: The development of special conducting plastics to meet the special needs of radiation dosimetry is reported. The most critical application of the special plastics is in the construction of ionization chambers which provide the best means of accurately measuring absorbed dose and exposure, low-noise signal cables, and electrometers for the ionization chambers are described. (FS)
Date: October 31, 1979
Creator: Spokas, J. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Photovoltaic solar panel resistance to simulated hail. Low-Cost Solar Array Project

Description: As part of the Jet Propulsion Laboratory's Low-Cost Solar Array Project, test methods have been evaluated and procedures developed for testing photovoltaic flat-plate solar cell modules for resistance to impact by hailstones. Testing has included the use of simulated hailstones (frozen ice spheres projected at terminal velocity), steel balls, and other projectile types applied with three loading methods: pneumatic gun, gravity drop, and static loading. Results are presented that compare the adv… more
Date: October 15, 1978
Creator: Moore, D. & Wilson, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Effect of environmental stress on Sylgard 170 silicone elastomer

Description: Dow Corning Sylgard 170 Silicone Elastomer has been investigated to characterize its response to accelerated thermal aging, radiation exposure, and its behavior under applied compressive forces. Sylgard 170 response to accelerated thermal aging suggests the material properties are not particularly age dependent. Radiation exposures, however, produce significant, monotonic changes in both elongation and hardness with increasing absorbed radiation dose. Elastomer response to an applied compressiv… more
Date: May 1, 1985
Creator: Buckalew, W.H. & Wyant, F.J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Low Temperature Measurement of Thermal and Mechanical Properties of Phenolic Laminate, the Pultruded Polyester Fiberglass and A and B Epoxy Putty

Description: Low temperature measurements were made and are reported of thermal and mechanical properties of phenolic laminate, pultruded polyester fiberglass, and A and B epoxy putty. To determine the modulus, compressive and tensile stress and strain, an Instron machine, a Tinus-Olsen testing machine, a Wheatstone bridge and strain gages were used. (FS)
Date: January 1, 1979
Creator: Wang, S. T.; Kim, S. H.; Kim, N. S.; Cheng, R. S.; Hoffman, J. & Gonczy, J.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

First results from electron-photon damage equivalence studies on a generic ethylene-propylene rubber

Description: As part of a simulator adequacy assessment program, the relative effectiveness of electrons and photons to produce damage in a generic ethylene propylene rubber (EPR) has been investigated. The investigation was limited in extent in that a single EPR material, in three thickness, was exposed to Cobalt-60 photons and three electron beam energies. Basing material damage on changes in the EPR mechanical properties elongation and tensile strength, we observed that EPR damage was a smoothly varying … more
Date: April 1, 1986
Creator: Buckalew, W.H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Accelerated aging tests of liners for uranium mill tailings disposal

Description: This document describes the results of accelerated aging tests to determine the long-term effectiveness of selected impoundment liner materials in a uranium mill tailings environment. The study was sponsored by the US Department of Energy under the Uranium Mill Tailings Remedial Action Project. The study was designed to evaluate the need for, and the performance of, several candidate liners for isolating mill tailings leachate in conformance with proposed Environmental Protection Agency and Nuc… more
Date: November 1, 1981
Creator: Barnes, S. M.; Buelt, J. L. & Hale, V. Q.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of improved gaskets, sealants and cables for use in geothermal well logging equipment. Final summary report

Description: The inventigation of materials which could be used for fabricating elastomeric seals for geothermal well logging equipment is described. The seals were to be made either from a methylphenylcarborane-siloxane base gum stock, or from new fluoroelastomer compounds synthesized at Hughes Aircraft Company. A literature search was made to obtain data on carborane-siloxane polymers, synthesis routes for fluorinated elastomers and high temperature hydrolytic stability tests of elastomers. Information wa… more
Date: October 1, 1978
Creator: Schwartz, S.; Basiulis, D.; Leyden, R. & Landis, A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Development of plastic heat exchangers for ocean thermal energy conversion. Final report, August 1976--December 1978

Description: Materials and processes have been selected and design information obtained for plastic ocean thermal energy conversion (OTEC) heat exchangers as the result of a program comprising five types of laboratory experiments. Tests to evaluate the chemical resistance of seven commercially available thermoplastics to sea water and several possible working fluids were conducted with emphasis placed on compatibility with ammonia. Environmental rupture tests involving exposure of stressed specimens to sea … more
Date: January 1, 1979
Creator: Hart, G.K.; Lee, C.O. & Latour, S.R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Polyethylene solidification of low-level wastes

Description: This topical report describes the results of an investigation on the solidification of low-level radioactive waste in polyethylene. Waste streams selected for this study included those which result from advanced volume reduction technologies (dry evaporator concentrate salts and incinerator ash) and those which remain problematic for solidification using contemporary agents (ion exchange resins). Four types of commercially available low-density polyethylenes were employed which encompass a rang… more
Date: February 1, 1985
Creator: Kalb, P. D. & Colombo, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Creep and thermal effects in aging solids

Description: The purpose of this paper is to describe three constitutive models that have been developed for rocks, concrete and filled polymers to represent creep, thermal, stress, and aging effects. Also described in the paper are how these constitutive models are being used to numerically predict the behavior of solids in such diverse situations as aging creep of concrete structures and creeping mantle convection. In all cases low strain rate, compressive material behavior is the main interest.
Date: January 1, 1983
Creator: Anderson, C. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Waste Form Evaluation Program. Final report

Description: This report presents data that can be used to assess the acceptability of polyethylene and modified sulfur cement waste forms to meet the requirements of 10 CFR 61. The waste streams selected for this study include dry evaporator concentrate salts and incinerator ash as representative wastes which result from advanced volume reduction technologies and ion exchange resins which remain problematic for solidification using commercially available matrix materials. Property evaluation tests such as … more
Date: September 1, 1985
Creator: Franz, E.M. & Colombo, P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Modified sulfur cement solidification of low-level wastes

Description: This topical report describes the results of an investigation on the solidification of low-level radioactive wastes in modified sulfur cement. The work was performed as part of the Waste Form Evaluation Program, sponsored by the US Department of Energy's Low-Level Waste Management Program. Modified sulfur cement is a thermoplastic material developed by the US Bureau of Mines. Processing of waste and binder was accomplished by means of both a single-screw extruder and a dual-action mixing vessel… more
Date: October 1, 1985
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Properties of radioactive wastes and waste containers. [Marlex CL-100]

Description: Major tasks in this NRC-sponsored program include: (1) an evaluation of the acceptability of low-level solidified wastes with respect to minimizing radionuclide releases after burial; and (2) an assessment of the influence of pertinent environmental stresses on the performance of high-integrity radwaste container (HIC) materials. The waste form performance task involves studies on small-scale laboratory specimens to predict and extrapolate: (1) leachability for extended time periods; (2) leach … more
Date: January 1, 1984
Creator: Arora, H.S. & Dayal, R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Field performance assessment of synthetic liners for uranium tailings ponds: a status report

Description: The objective of this study is to provide a database to support US Nuclear Regulatory Commission (NRC) licensing of uranium tailings leachate isolation impoundments. This objective is being accomplished by determining the effectiveness of design, installation, and quality assurance practices associated with uranium mill tailings impoundments with flexible membrane liners. The program includes testing of chemical resistance and physical performance of liners, leak detection systems, and seam ins… more
Date: March 1, 1984
Creator: Mitchell, D.H. & Spanner, G.E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of Kevlar-49 yarn

Description: A study was made to determine the variability in Dupont's 380-denier Kevlar-49 yarn. Both in-spool and spool-to-spool variations in tensile strength, cross-sectional area, and chemical composition were determined for one lot of material.
Date: July 1, 1978
Creator: Thompson, W. F.; Powell, G. L. & Lever, W. E.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Evaluation of ceramic and polymeric materials for use in engineered barrier systems

Description: Ceramic materials evaluated in the screening studies were Al/sub 2/O/sub 3/ (99.8%), mullite, vitreous silica, BaTiO/sub 3/, CaTiO/sub 3/, CaZrO/sub 3/, CaTiSiO/sub 5/, TiO/sub 2/, ZrSiO/sub 4/, basalt, Pyroceram 9617, and Marcor code 9658 machinable glass ceramic. One grade of graphite (Toyotanso IB-11) was also evaluated. Demineralized water, a synthetic Hanford groundwater, and a synthetic NaCl brine solution were used in the screening tests. Demineralized water was used in all five of the l… more
Date: January 1, 1980
Creator: Fullam, H.T. & Skiens, W.E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Effect of cure temperature and isocyanate index on the softening point of rigid polyurethane foam

Description: Thermomechanical and mechanical spectrometry analyses were used to determine the influence of the cure temperature and the isocyanate index on the softening temperature of molded, rigid urethane foam. Foams were formulated from both polyether and polyester polyols, molded to a density of 350 kg/m/sup 3/, and cured at various temperatures. Test results indicate that an increase in the cure temperature produces an increase in the softening temperature of the foam until a maximum value is achieved… more
Date: August 1, 1977
Creator: Neet, T. E.; Parker, B. G. & Smith, C. H.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Evaluation of polymers for fast neutron personnel dosimetry by the electrochemical etching technique

Description: Four plastics have been evaluated as potential fast neutron dosimeters, namely cellulose acetate, cellulose triacetate, cellulose acetobutyrate and polycarbonate. The technique of nuclear track registration in the plastics was used as the method of dosimetry.
Date: December 1, 1978
Creator: Johnson, S. A.; Ziemer, P. L.; Gammage, R. B. & Thorngate, J. H.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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