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  • Other Sources  (12)
  • 1
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    Aminophenoxycyclotriphosphazene cured epoxy resins and the composites, laminates, adhesives and structures thereof (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Aminophenoxy cyclotriphosphazenes such as hexakis (4-aminophenoxy) cyclotriphosphazene and tris (4-aminophenoxy)-tris phenoxy cyclotriphosphazene are used as curing agents for epoxy resins. These 1,2-epoxy resins are selected from di- or polyepoxide containing organic moieties of the formula (CH2-CHO-CH2) m-W-R-W- (CH2CH-CH2O)m where R is diphenyl dimethylmethane, diphenylmethane; W is a nitrogen or oxygen atom; and m is 1 when W is oxygen and 2 when W is nitrogen. The resins are cured thermally in stages at between about 110 to 135 C for between about 1 and 10 min, then at between about 175 to 185 C for between 0.5 to 10 hr and post cured at between about 215 and 235 C for between 0.1 and 2 hr. These resins are useful for making fire resistant elevated temperature stable composites, laminates, molded parts, and adhesives and structures, usually for aircraft secondary structures and for spacecraft construction.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 2
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    Process for preparing phthalocyanine polymer from imide containing bisphthalonitrile (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Imide-linked bisphthalonitrile compounds are prepared by combining a dicyano aromatic diamine and an organic dianhydride to produce an amic acid linked bisphthalonitrile compound. The amic acid linked bisphthalonitrile compound is dehydrocyclized to produce the imide-linked bisphthalonitrile compounds. The imide-linked bisphthalonitrile compounds may be polymerized to produce a phythalocyanine polymer by heating the imide-linked bisphthalonitrile compound, either alone or in the presence of a metal powder or a metal salt. These compounds are useful in the coating, laminating and molding arts. The polymers are useful in composite matrix resins where increased fire resistance, toughness and resistance to moisture are required, particularly as secondary structures in aircraft and spacecraft.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 3
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    Vinyl stilbazoles (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers are substantially below the cure temperatures of the bismaleimides alone. Reinforced composites made from the cured copolymers are disclosed as well.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 4
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    Fire and heat resistant laminating resins based on maleimido substituted aromatic cyclotriphosphazene polymer (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: 4-Aminophenoxy cyclotriphosphazenes are reacted with maleic anhydride to produce maleamic acids which are converted to the maleimides. The maleimides are polymerized. By selection of starting materials (e.g., hexakis amino or trisaminophenoxy trisphenoxy cyclotriphosphazenes), selection of molar proportions of reactants, use of mixtures of anhydrides and use of dianhydrides as bridging groups a variety of maleimides and polymers are produced. The polymers have high limiting oxygen indices, high char yields and other useful heat and fire resistant properties making them useful as, for example, impregnants of fabrics.
    Keywords: NONMETALLIC MATERIALS
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  • 5
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    Structural panels (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are disclosed. These vinylpyridines form copolymers with bismaleimides which copolymers have good fire retardancy and decreased brittleness. The cure temperatures of the copolymers are substantially below the cure temperatures of the bismaleimides alone. Reinforced composites made from the cured copolymers are disclosed as well.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 6
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    Process for curing bismaleimide resins (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: This invention relates to vinyl pyridine group containing compounds and oligomers, their advantageous copolymerization with bismaleimide resins, and the formation of reinforced composites based on these copolymers. When vinyl pyridines including vinyl stilbazole materials and vinyl styrylpyridine oligomer materials are admixed with bismaleimides and cured to form copolymers the cure temperatures of the copolymers are substantially below the cure temperatures of the bismaleimides alone.
    Keywords: NONMETALLIC MATERIALS
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    NASA TECHNICAL REPORTS
  • 7
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    Unknown
    Aromatic cyclotriphosphazenes (1988)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Four-Aminophenoxy cyclotriphosphazenes are reacted with maleic anhydride to produce maleamic acids which are converted to the maleimides. The maleimides are polymerized. By selection of starting materials (e.g., hexakis amino or trisaminophenoxy trisphenoxy cyclotrisphosphazenes), selection of molar porportions of reactants, use of mixtures of anhydrides and use of dianhydrides as bridging groups a variety of maleimides and polymers are produced. The polymers have high limiting oxygen indices, high char yields and other useful heat and fire resistant properties making them useful as, for example, impregnants of fabrics.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
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    NASA TECHNICAL REPORTS
  • 8
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    Process for the manufacture of low density bis-maleimide-carbon microballoon composites (1980)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: A process for the preparation of composite laminate structures of glass cloth preimpregnated with polybismaleimide resin and adhered to a polybismaleimide-glass or aromatic polyamide paper honeycomb cell structure filled or partially filled with a syntactic foam consisting of a mixture of bismaleimide resin and carbon microballoons. The carbon microballoons are prepared by pyrolyzing phenolic microballoons and subsequently bonded using a 2% bismaleimide solution. The laminate structures are cured for two hours at 477.degree. K. and are adhered to the honeycomb bismaleimide adhesive using a pressure of 700 kN/m.sup.2 pressure at 450.degree. K. The laminate composite is then post-cured for two hours at 527.degree. K. to produce a composite laminate having a density in the range from about 95 kilograms per cubic meter to 130 kilograms per cubic meter.
    Keywords: Chemistry and Materials (General)
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    NASA TECHNICAL REPORTS
  • 9
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    Toxicity of Pyrolysis Gases from Elastomers (1977)
    In:  CASI
    Details
    Publication Date: 2019-08-14
    Description: The toxicity of the pyrolysis gases from six elastomers was investigated. The elastomers were polyisoprene (natural rubber), styrene-butadiene rubber (SBR), ethylene propylene diene terpolymer (EPDM), acrylonitrile rubber, chlorosulfonated polyethylene rubber, and polychloroprene. The rising temperature and fixed temperature programs produced exactly the same rank order of materials based on time to death. Acryltonitrile rubber exhibited the greatest toxicity under these test conditions; carbon monoxide was not found in sufficient concentrations to be the primary cause of death.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA-TM-78461 , A-7303
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    NASA TECHNICAL REPORTS
  • 10
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    Stronger Fire-Resistant Epoxies (1988)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: New curing agent improves mechanical properties and works at lower temperature. Use of aminophenoxycyclotriphosphazene curing agents yields stronger, more heat- and fire-resistant epoxy resins. Used with solvent if necessary for coating fabrics or casting films.
    Keywords: MATERIALS
    Type: ARC-11548 , NASA Tech Briefs (ISSN 0145-319X); 12; 1; P. 61
    Format: text
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