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  • 1
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    Synthesis of a new class of highly fluorinated aliphatic diisocyanates (1971)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Synthesis is basis for preparation of polyurethanes that are compatible with liquid oxygen. The two step process preparation from fluorocarbon diacid fluorides is explained in text.
    Keywords: MATERIALS
    Type: MFS-20883
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Rapid Annealing Of Amorphous Hydrogenated Carbon (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Report describes experiments to determine effects of rapid annealing on films of amorphous hydrogenated carbon. Study represents first efforts to provide information for applications of a-C:H films where rapid thermal processing required. Major finding, annealing causes abrupt increase in absorption and concomitant decrease in optical band gap. Most of change occurs during first 20 s, continues during longer annealing times. Extend of change increases with annealing temperature. Researchers hypothesize abrupt initial change caused by loss of hydrogen, while gradual subsequent change due to polymerization of remaining carbon into crystallites or sheets of graphite. Optical band gaps of unannealed specimens on silicon substrates lower than those of specimens on quartz substrates.
    Keywords: MATERIALS
    Type: LEW-14664 , NASA Tech Briefs (ISSN 0145-319X); 13; 7; P. 58
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Amorphous Insulator Films With Controllable Properties (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: In experiments described in report, amorphous hydrogenated carbon films grown at room temperature by low-frequency plasma deposition, using methane or butane gas. Films have unique array of useful properties; (a) adhere to wide variety of materials; (b) contain only carbon and hydrogen; (c) smooth and free of pinholes; (d) resistant to attack by moisture and chemicals; and (e) have high electric-breakdown strength and electrical resistivity. Two of optical properties and hardness of this film controlled by deposition conditions. Amorphous a-C:H and BN films used for hermetic sealing and protection of optical, electronic, magnetic, or delicate mechanical systems, and for semiconductor field dielectrics.
    Keywords: MATERIALS
    Type: LEW-14370 , NASA Tech Briefs (ISSN 0145-319X); 11; 9; P. 64
    Format: text
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    NASA TECHNICAL REPORTS
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