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  • COMPOSITE MATERIALS  (3)
  • Ionization potential  (1)
  • 1
    Electronic Resource
    Electronic Resource
    A study of hydrogen bond strengths of neutral water clusters (H2O) n using modified MNDO (1986)
    Springer
    Theoretical chemistry accounts 70 (1986), S. 3-10 
    Details
    ISSN: 1432-2234
    Keywords: I-MNDO ; MNDO ; Hydrogen bond ; Ionization potential ; Water clusters ; Water dimer ; Electronic polarizability ; Parametrization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Semi-empirical molecular orbital methods proposed up to now seriously fail to describe hydrogen bonded systems associated with (H2O) n . A new scheme of parametrization using a semi-empirical method is proposed. We tested hydrogen bonding associated with the water clusters (H2O) n . The results are found to be close to ab initio Hartree-Fock quality, indicating a good promise for studying hydrogen-bonding systems other than O-H...O moiety.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00531146
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    Paper (German National Licenses)
    Fulltext
  • 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
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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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: COMPOSITE MATERIALS
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Vinylstyrylpyridine-modified bismaleimide composite resins (1984)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Vinylstilbazole (vinylstyrylpyridine) and vinylpolystyrylpyridine was prepared for the purpose of modifying bismaleimide composite resins. Cure studies of resin systems were investigated by differential scanning calorimetry. The vinylstyrylpyridine-modified bismaleimide composite resins were found to have lower cure and gel temperatures, and shorter cure times than the corresponding unmodified composite resins. The resin systems were reinforced with commercially available satin-weave carbon cloth fabricated by hot melt (or solvent) techniques. Thermal stability, flammability, moisture absorption, and mechanical properties of the composites (such as flexural strength, modulus, tensile and short beam shear strength) were determined. Composite laminates showed substantial improvements in both processability and mechanical properties compared to the bismaleimide control systems.
    Keywords: COMPOSITE MATERIALS
    Type: Technology vectors; Apr 03, 1984 - Apr 05, 1984; Reno, NV
    Format: text
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    NASA TECHNICAL REPORTS
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