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  • 1
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    Unknown
    Kinetic study of polymerization/curing of filament-wound composite epoxy resin systems with aromatic diamines (1986)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Photosensitized oxidation of unsaturated polymers (1980)
    In:  Other Sources
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    Publication Date: 2011-08-17
    Description: A review of the photosensitized oxidation of singlet oxygenation of unsaturated hydrocarbon polymers and of their model compounds is presented. The cis and trans forms of 1,4-polyisoprene, 1,4-polybutadiene and 1,2-poly(1,4-hexadiene) are studied, and their microstructural changes which occur on reaction with (IO2) in solution were investigated by infrared, (H-1) and (C-13) NMR spectroscopy. The polymers yielded allylic hydroperoxides with shifted double bonds according to the 'ene' mechanism of simple olefins. It was shown that single oxygenation of unsaturated polymers is similar to their low molecular weight analogs, and that the differences are due to secondary processes affecting the (IO2)-reacted polymers.
    Keywords: NONMETALLIC MATERIALS
    Type: Pure and Applied Chemistry; 52; 1980
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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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    NASA TECHNICAL REPORTS
  • 4
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    Nuclear magnetic resonance study of thermal oxidation of polyisoprene (1975)
    In:  Other Sources
    Details
    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
    Format: text
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    NASA TECHNICAL REPORTS
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