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  • NONMETALLIC MATERIALS  (2)
  • 1
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    Polyphenylquinoxalines containing alkylenedioxy groups (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Polyphenylquinoxalines were prepared from the reaction of bis(alpha-diketones) with aromatic bis(ortho-diamines). These polyphenylquinoxalines have lower glass transition temperatures and melt viscosities and consequently better processability than known polyphenylquinoxalines. The properties of these polyphenylquinoxalines (tensile strength, modulus, elongation, adhesive strength, fracture energy, and solvent resistance) are comparable with the properties of known polyphenylquinoxalines.
    Keywords: NONMETALLIC MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Synthesis and characterization of processable polyimides with enhanced thermal stability (1987)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Many of the emerging applications of polymers on space vehicles require materials with outstanding thermal stability. These polymers must also be readily processable in order to facilitate their use. The syntheses and polymerization of a cardo dianhydride were investigated. This monomer was prepared via the reaction of N-methyl 4-nitrophthalimide with a cardo diol. Polyimides containing oxyalkylene linkages were studied. The effects of two additional structural modifications on the polymers' properties were investigated. The effects of carrying out the preparation of poly(amic acid)s under non-equilibrium conditions were examined. Approaches that were investigated included the in-situ neutralization of the generated amic acid and its in-situ esterification.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA-CR-181447 , NAS 1.26:181447
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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