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  • NONMETALLIC MATERIALS  (3)
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  • 1
    facet.materialart.
    Unknown
    Radio-frequency electrical properties of some neat and metal-doped polyimides (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: As the size and complexity of aerospace systems increase, the uses of polymers are also expected to increase. Polyimides constitute one promising generic class of polymeric materials. They retain good mechanical and physical properties at higher temperatures and absorb less moisture than do the epoxies, which are the polymers most frequently used in present aerospace systems. The properties of these polyimide materials are, therefore, of considerable interest to the aerospace community. Of particular importance are the electrical properties because these properties relate to both electrical and structural applications.
    Keywords: NONMETALLIC MATERIALS
    Type: Studies of Molecular Properties of Polymeric Materials: Aerospace Environmental Effects on Three Linear Polymers; p 35-36
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Studies of molecular properties of polymeric materials: Aerospace environmental effects on three linear polymers (1985)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The development of crystal handling techniques for reflection infrared spectroscopy and methods for the fabrication and testing of tensile specimens are discussed. Data from mechanical, ac and dc electrical, and electron paramagnetic resonance studies conducted to determine the effects of 0.1-MeV and 1.0-MeV electron radiation on Mylar, Kapton, Ultem, and metal-doped Ultem are presented. Total doses ranging from 1 X 10 to the 8 rads to 1 X 10 to the 10 rads and dose rates from 5 X 10 to the 7 rads/hr to 1 X 10 to the 9 rads/hr were employed. The results of a study on the effects of aircraft service-environment fluids on Ultem are also reported. The weights and mechanical properties of Ultem were evaluated before and after exposure to water, JP4, Skydrol, an antifreeze, and a paint stripper.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-TM-87532 , NAS 1.15:87532
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Mechanism of electrical conductivity in an irradiated polyimide (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: A polyimide was exposed to 1.0 MeV electron radiation. The radiation-induced radical density and dc conductivity were measured at various post-irradiation times. The radiation-induced radical density was found to be correlated to the increased dc conductivity through a hopping model of conductivity. The post-irradiation radical species were identified.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Physics and Chemistry of Solids (ISSN 0022-3697); 50; 7 19
    Format: text
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    NASA TECHNICAL REPORTS
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