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  • 1980-1984  (6)
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Year
  • 1
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    Unknown
    Effects of intermediate-energy electrons on mechanical and molecular properties of a polyetherimide (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: An experiment, using 100-keV electrons and 10 to the 9th -rad doses, was conducted on Ultem polyetherimide film. Mechanical, electron paramagnetic resonance, and infrared spectroscopic data suggested that the radiation produced crosslinking and embrittlement of the material.
    Keywords: NONMETALLIC MATERIALS
    Type: IEEE Transactions on Nuclear Science (ISSN 0018-9499); NS-31; 1293-129
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Property changes of a graphite/epoxy composite exposed to nonionizing space parameters (1980)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A study has been made of the changes in the mass, thickness and flexural properties of initially wet and dry specimens of graphite/epoxy composite material due to the equivalent of eight weeks of exposure to nonionizing space environmental parameters. The parameters were near and middle solar UV irradiance, high vacuum, and temperature. The flexural properties were not affected by the exposures. Changes occurred to the mass, dimensions, and surface morphology of the specimens which varied with individual and combined parameter exposures. The combined UV and elevated thermal environment had synergistic effects on the properties of the specimens.
    Keywords: COMPOSITE MATERIALS
    Type: Journal of Composite Materials; 14; Oct. 198
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Infrared spectroscopic analysis of the effects of simulated space radiation on a polyimide (1981)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: Infrared spectroscopic techniques have been used to study the effects of electron radiation on the polyimide PMDA-p,p-prime- ODA. The radiation exposures were made at various dose rates, for a total dose approximately equal to that for 30 years of exposure to electron radiation in geosynchronous earth orbit. At high dose rates the major effect was probably the formation of a polyisoimide or a charged quaternary amine, and at the low dose rates the effect was a reduction in the amount or aromatic ether linkage. In addition, the effects of dose rate for a small total dose were studied. Elevated temperatures occurred at high dose rates and were, in part, probably the cause of the radiation product. The data suggest that dose rates for accelerated simulations of the space environment should not exceed 100,000 rads/sec.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    The effects of electron and gamma radiation on epoxy-based materials (1982)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: Specimens of graphite/epoxy composites and epoxy resins were exposed to electron and gamma radiation, followed by mechanical property and fundamental measurements. Measurement techniques included: scanning electron microscopy, X-ray diffraction analysis, and electron spin resonance spectroscopic analysis. Results indicate little or no change in flexural properties of miniature specimens of a graphite/epoxy composite and no change in failure mode at the fiber-resin interface and in the crystallinity of the fiber and the resin. Some doubt in the observation of stable flexural properties is cast by electron paramagnetic resonance spectra of a relatively large number of radiation-generated radicals. These generally lead to a change in cross-linking and in chain-scissioning which should alter mechanical properties.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Large Space Systems Technol., 1981; p 27-36
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 5
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    Advanced materials for space (1980)
    In:  CASI
    Details
    Publication Date: 2016-06-07
    Description: The principal thrust of the LSST program is to develop the materials technology required for confident design of large space systems such as antennas and platforms. Areas of research in the FY-79 program include evaluation of polysulfones, measurement of the coefficient of thermal expansion of low expansion composite laminates, thermal cycling effects, and cable technology. The development of new long thermal control coatings and adhesives for use in space is discussed. The determination of radiation damage mechanisms of resin matrix composites and the formulation of new polymer matrices that are inherently more stable in the space environment are examined.
    Keywords: LAUNCH VEHICLES AND SPACE VEHICLES
    Type: Large Space Systems Technol., 1979; p 485-504
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Low-energy electron effects on tensile modulus and infrared transmission properties of a polypyromellitimide film (1981)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Infrared (IR) spectroscopy and tensile modulus testing were used to evaluate the importance of experimental procedure on changes in properties of pyromellitic dianhydride-p,p prime-oxydianiline film exposed to electron radiation. The radiation exposures were accelerated, approximate equivalents to the total dose expected for a 30 year mission in geosynchronous Earth orbit. The change in the tensile modulus depends more on the dose rate and the time interval between exposure and testing than on total dose. The IR data vary with both total dose and dose rate. A threshold dose rate exists below which reversible radiation effects on the IR spectra occur. Above the threshold dose rate, irreversible effects occur with the appearance of a new band. Post-irradiation and in situ IR absorption bands are significantly different. It is suggested that the electron radiation induced metastable, excites molecular states.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-81977 , L-13935
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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