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  • Other Sources  (12)
  • 1
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    Ceramic fibers from Si-B-C polymer precursors (1993)
    In:  Other Sources
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    Publication Date: 2011-08-24
    Description: Non-oxide ceramics such as silicon carbide (SiC), silicon nitride (Si3N4), and silicon borides (SiB4, SiB6) have thermal stability, oxidation resistance, hardness, and varied electrical properties. All these materials can be prepared in a fiber form from a suitable polymer precursor. The above mentioned fibers, when tested over a temperature range from 25 to 1400 C, experience degradation at elevated temperatures. Past work in ceramic materials has shown that the strength of ceramics containing both carbides and borides is sustained at elevated temperatures, with minimum oxidation. The work presented here describes the formation of ceramic fibers containing both elements, boron and silicon, prepared via the polymer precursor route previously reported by the authors, and discusses the fiber mechanical properties that are retained over the temperature range studied.
    Keywords: NONMETALLIC MATERIALS
    Type: SAMPE Quarterly (ISSN 0036-0821); 24; 3; p. 9-14.
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    NASA TECHNICAL REPORTS
  • 2
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    Modification of epoxy-reinforced glass-cloth composites with a perfluorinated alkyl ether elastomer (1984)
    In:  Other Sources
    Details
    Publication Date: 2011-08-18
    Description: A perfluorinated alkyl ether diacyl fluoride prepolymer (molecular weight about 1500) was coreacted with Epon 828 epoxy resin and diamino diphenyl sulfone to obtain an elastomer-toughened, glass-cloth composite. Improvements in flexural toughness, impact resistance, and water resistance, without loss of strength, modulus of elasticity or a lowering of the glass-transition temperature, were realized over those of the unmodified composite. Factors concerning optimization of the process are discussed. Results suggest that a simultaneously interpenetrating polymer network may be formed which gives rise to a measured improvement in composite mechanical properties.
    Keywords: COMPOSITE MATERIALS
    Type: Polymer Composites (ISSN 0272-8397); 5; 198-201
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    NASA TECHNICAL REPORTS
  • 3
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    New bismaleimide matrix resins for graphite fiber composites (1985)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: Two new bismaleimide resins based on the N, N'-m-phenylene-bis(m-amino-benzamide) structure have been synthesized and characterized. The mixtures of the two resins gave better handling, processing, mechanical, and thermal properties in graphite composites than did the individual resins. The mechanical strength of the cured graphite composites prepared from the 1:1 copolymer of the two bismaleimide resins was excellent at both ambient and elevated temperatures. The physical and mechanical properties of the composites from the new bismaleimide matrix resin systems are compared with conventional composites based on epoxy and other bismaleimide systems. The copolymer system provides another method for improving bismaleimide resins.
    Keywords: COMPOSITE MATERIALS
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  • 4
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    New bismaleimide matrix resins for graphite fiber composites (1985)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Two new bismaleimide resins based on the N,N'-m-phenylene-bis(m-amino-benzamide) structure have been synthesized and characterized. The mixtures of the two resins gave better handling, processing, mechanical, and thermal properties in graphite composites than did the individual resins. The mechanical strength of the cured graphite composites prepared from the 1:1 copolymer of the two bismaleimide resins was excellent at both ambient and elevated temperatures. The physical and mechanical properties of the composites from the new bismaleimide matrix resin systems are compared with conventional composites based on epoxy and other bismaleimide systems. The copolymer system provides another method for improving bismaleimide resins.
    Keywords: NONMETALLIC MATERIALS
    Type: SAMPE Journal (ISSN 0091-1062); 21; 11-16
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  • 5
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    Perfluoro (Imidoylamidine) diamidines (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Perfluoroether triazine elastomers having improved properties are prepared from oligomeric imidoylamidines that were in turn, prepared by the process of: (1) reacting a perfluorodinitrile with liquid ammonia to yield a perfluorodiamidine, (2) isolating the perfluorodiamidine, (3) reacting the isolated diamidine with a perfluorodinitrile to yield a perfluoro(imidoylamidine) dinitrile, and then repeating the steps to sequentially grow an oligomer of desired molecular size. The isolated amidine and nitrile intermediates are also disclosed. The elastomers can be fashioned into seals, gaskets, and sealing components and the like.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Format: application/pdf
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  • 6
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    Heat transfer and forces for free-molecule flow on a concave cylindrical surface. (1964)
    In:  Other Sources
    Details
    Publication Date: 2019-05-22
    Description: Heat transfer rate, adiabatic wall temperature and forces exerted for free molecule flow on concave cylindrical surface
    Keywords: GEOPHYSICS
    Type: ASME PAPER 62-WA-181
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  • 7
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    Process for preparing perfluorotriazine elastomers and precursors thereof (1984)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Perfluoroether triazine elastomers having improved properties and utility in seals, gaskets, sealing components and the like are prepared from oligomeric imidoylamidines that have, in turn, been prepared by the process of (1) reacting a perfluorodinitrile with liquid ammonia to yield a perfluorodiamidine, (2) isolating the perfluorodiamidine, (3) reacting the isolated diamidine with a perfluorodinitrile to yield a perfluoror(imidoylamidine) dinitrile, and then repeating step (1), (2), and (3) to sequentially grow an oligomer of desired molecular size. The isolated amidine and nitrile intermediates are also described.
    Keywords: NONMETALLIC MATERIALS
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  • 8
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    Perfluoroalkylene-Ether Triazine Elastomers (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: New process yields product that resists heat and action of oxygen and water. Ring closing step, which gives elastomer its stability, imidoylamidine dinitrile reacts with perfluoroether acide, yielding prepolymer. Prepolymer then treated with ammonia and cured by heating to form polymer. Elastomers are highly resistant to heat, oxidation, and hydrolysis.
    Keywords: MATERIALS
    Type: ARC-11402 , NASA Tech Briefs (ISSN 0145-319X); 8; 1; P. 58
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  • 9
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    Evaluation of Tietjens function in stability calculations. (1966)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Description: Tietjens function reexpressed as ratio of rapidly converging power series of complex argument and used in calculation of critical Reynolds numbers
    Keywords: FLUID MECHANICS
    Type: PHYSICS OF FLUIDS
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  • 10
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    Stability of the developing laminar flow in a parallel-plate channel. (1967)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Hydrodynamic stability of developing laminar flow in entrance region of parallel plate channel investigated using small disturbances theory
    Keywords: FLUID MECHANICS
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