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  • 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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  • 2
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    New phosphorus-containing bisimide resins (1984)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: Phosphorus-based flame retardants have been effectively used in a wide variety of polymeric materials. Such additives, however, may either influence the decomposition reaction in polymers or lack durability due to a tendency to be leached out by solvents. Attention is given to the synthesis, characterization, thermal stability and degradation mechanisms of bisimide resins, and an evaluation is conducted of the flammability and mechanical properties of graphite cloth-reinforced laminates fabricated from one of the six phosphorus-containing bisimide resins considered.
    Keywords: NONMETALLIC MATERIALS
    Type: IN: Contemporary topics in polymer science. Volume 4. New York; 115-139
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  • 3
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    Kinetic study of polymerization/curing of filament-wound composite epoxy resin systems with aromatic diamines (1986)
    In:  Other Sources
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    Publication Date: 2011-08-19
    Description: The kinetics of polymerization/curing of a filament-wound composite epoxy resin consisting of an 80/20 DGEBA/DGEBD blend and an MDA/m-PDA blend (Tonox 60/40) was studied at various temperatures and at amine epoxy ratios between 1.1 and 4.4 by means of Fourier-transform (FT) IR and bulk viscosity measurements. The activation energy for the polymerization/curing reaction using an amine/epoxy ratio of 1.1 was 11.9 kcal/mole, in agreement with a previous value. The FT-IR conversion-time plots were fitted to a kinetic expression containing two rate constants with activation energies of 13.7 and 10.0 kcal/mole. The bulk viscosity followed the Williams et al. (1955) equation, with a Di Benedetto (1965) expression for the glass transition temperature.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Applied Polymer Science (ISSN 0021-8995); 32; 5215-522
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  • 4
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    Correlation between stimulated scattering processes and laser-induced damage in crystalline quartz (1977)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: The results of a systematic series of experiments to uncover possible correlation between laser-induced stimulated-Brillouin-scattering (SBS) phonons and damage in quartz are presented. Such correlation is confirmed and the various thresholds are established. The anomalous transmission factor under phonon generation is found to decay exponentially as predicted with increasing incident laser power. The LF SBS phonon is also demonstrated to be a sensitive probe for precatastrophic damage.
    Keywords: NONMETALLIC MATERIALS
    Type: Electronics Letters; 13; Apr. 14
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  • 5
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    Plasma etching of poly/N,N'-/p,p'- oxydiphenylene/pyromellitimide/ film and photo/thermal degradation of etched and unetched film (1979)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Keywords: NONMETALLIC MATERIALS
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  • 6
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    Perspective on thermal barrier coatings for industrial gas turbine applications (1995)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Thermal Barrier Coatings (TBC's) have been used in high thrust aircraft engines for many years, and have proved to be very effective in allowing higher turbine inlet temperatures. TBC life requirements for aircraft engines are typically less than those required in industrial gas turbines. The use of TBC's for industrial gas turbines can increase if durability and longer service life can be successfully demonstrated. This paper will describe current and future applications of TBC's in industrial gas turbine engines. Early testing and applications of TBC's will also be reviewed. This paper focuses on the key factors that are expected to influence utilization of TBC's in advanced industrial gas turbine engines. It is anticipated that reliable, durable and high effective coating systems will be produced that will ultimately improve engine efficiency and performance.
    Keywords: NONMETALLIC MATERIALS
    Type: NASA. Lewis Research Center, Thermal Barrier Coating Workshop; p 19
    Format: application/pdf
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  • 7
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    Nuclear magnetic resonance study of thermal oxidation of polyisoprene (1975)
    In:  Other Sources
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    Publication Date: 2011-08-16
    Description: An investigation was conducted concerning the microstructural changes occurring in cis- and trans-1,4-polyisoprenes during uncatalized thermal oxidation in the solid phase. The investigation made use of approaches based on proton and carbon-13 NMR spectroscopy. The oxidation of squalene and dihydromyrcene in the liquid phase was also studied. The studies provide the first NMR spectroscopic evidence for the presence of epoxy and peroxide, hydroperoxide, and alcohol groups within the oxidized polyisoprene chain.
    Keywords: NONMETALLIC MATERIALS
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  • 8
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    Characterization of cured polystyrylpyridine by model compounds (1981)
    In:  Other Sources
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    Publication Date: 2011-08-18
    Description: The crosslinking or curing reaction of polystyrylpyridine (PSP) has been studied by means of thermal reactions of its model compounds. Compounds 2,6-distyrylpyridine, 4-stilbazole, and deuterated 4-stilbazole were pyrolyzed at 200-325 C both in air and under vacuum in a sealed tube. The major pyrolysis products were diarylethane and stilbene, and were characterized by gas chromatography-mass spectrometry. Major dimeric products were naphthalene or quinoline derivatives. Mechanisms for the pyrolysis are suggested, and a crosslinked structure for cured PSP is proposed based on the thermal reaction products of model compounds.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Applied Polymer Science; 26; 1981
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  • 9
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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: NONMETALLIC MATERIALS
    Type: SAMPE Journal (ISSN 0091-1062); 21; 11-16
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  • 10
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    Boron-carbon-silicon polymers and ceramic and a process for the production thereof (1992)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The present invention relates to a process for the production of an organoborosilicon preceramic polymer. The polymer is prepared by the reaction of vinylsilane or vinlymethylsilanes (acetylene)silane or acetylene alkyl silanes and borane or borane derivatives. The prepolymer form is pyrolyzed to produce a ceramic article useful in high temperature (e.g., aerospace) or extreme environmental applications.
    Keywords: NONMETALLIC MATERIALS
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