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  • 1985-1989  (10)
  • 1
    Electronic Resource
    Electronic Resource
    The curing of epoxy resins with aminophenoxycyclotriphosphazenes (1986)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 24 (1986), S. 2415-2424 
    Details
    ISSN: 0887-624X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Aminophenoxycyclotriphosphazenes have been used as curing agents for epoxy resins. The thermal curing was performed in stages at 120-125 and 175-180°C followed by postcuring at 225°C to give tough brown polymers. The thermal curing reaction was monitored using FTIR and differential scanning calorimetry. Thermogravimetric analysis of the cured resins has shown thermal stability up to 350-340°C. The char yield obtained in nitrogen at 800°C was about 55-42% and in air at 700°C was about 40-32%. Graphite cloth laminates were prepared. The mechanical properties evaluated were found superior to those of commonly used epoxy resin systems. These resins are useful for making fire- and heat-resistant composites, laminates, molded parts, and adhesives.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1986.080241004
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    Paper (German National Licenses)
    Fulltext
  • 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
    Format: application/pdf
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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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  • 7
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    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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  • 8
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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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  • 9
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    Bismaleimide Copolymer Matrix Resins (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Graphite composites, prepared from 1:1 copolymer of two new bismaleimides based on N,N'-m-phenylene-bis(m-amino-benzamide) structure have mechanical properties superior to those prepared from other bismaleimide-type resins. New heat-resistant composites replace metal in some structural applications. Monomers used to form copolymers with superior mechanical properties prepared by reaction of MMAB with maleic or citraconic anhydride.
    Keywords: MATERIALS
    Type: ARC-11599 , NASA Tech Briefs (ISSN 0145-319X); 11; 9; P. 60
    Format: text
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  • 10
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    Catalytic Layer Makes Aircraft Seats More Fire Retardant (1987)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Specially constructed cushion retards fires in aircraft seats through action of catalytic matrix that cracks flammable gaseous decomposition products to less flammable species. Improved cushion contributes substantially to fire safety without adding significantly to weight or to manufacturing cost. In this fire-blocking covering for an aircraft seat cushion, flammable pyrolysis products cracked to less flammable species by catalytic layer covering foam core of cushion. Aluminum foil holds in pyrolysis vapors to promote catalysis and prevent spread of fire by ignition of released vapors.
    Keywords: MATERIALS
    Type: ARC-11423 , NASA Tech Briefs (ISSN 0145-319X); 11; 5; P. 36
    Format: text
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