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  • 1
    Electronic Resource
    Electronic Resource
    Biodegradability of photooxidized polyalkylenes (1984)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 29 (1984), S. 2581-2597 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Representative polyolefin films were exposed to UV radiation from light sources having different intensities and spectral distribution including the quartz mercury arc fluorescent lamps, xenon arc, and sunlight. Films exposed were polyethylene, polypropylene, and sensitized polyethylene. The oligomer fractions supported microbial growth, but the high polymers gave minimal or no growth. It was concluded that photooxidative degradation of polyolefins does not per se induce progressive attack by microorganisms. Oligomers present originally in the polymer are augmented by those produced by photooxidation. These oligomers support growth if separated from the polymer matrix. These observations explain some of the contradictory reports in the literature concerning the microbial degradation of sensitized polyolefins.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1984.070290814
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Pressure quenching and chain-extended crystallization of polyethylene (1975)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Physics Edition 13 (1975), S. 1501-1509 
    Details
    ISSN: 0098-1273
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Recent work has shown that so-called chain-extended crystallization of polyethylene is crystallization of the newly discovered hexagonal phase. This hypothesis is supported by experiments on the pressure quenching of molten polyethylene.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1975.180130804
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  • 3
    Electronic Resource
    Electronic Resource
    Hydrogen chain transfer in olefin polymerization with organometallic catalysts (1978)
    New York : Wiley-Blackwell
    Journal of Polymer Science: Polymer Chemistry Edition 16 (1978), S. 2337-2342 
    Details
    ISSN: 0360-6376
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Hydrogen has been shown to be a true chain-transfer agent with some organometallic olefin polymerization catalysts. However, the Mayo equation for chain transfer in free-radical polymerization does not fit quantitative data from organometallic catalysts. There appear to be two reasons for the lack of fit. First, the Mayo equation considers the competition between hydrogen and olefin for the growing chain but does not account for their competitive absorption on the catalyst (coordination with vacant orbitals on the transition metal). Second, some organometallic catalysts gradually absorb hydrogen irreversibly to give a new catalyst species of altered behavior.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1978.170160920
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  • 4
    Electronic Resource
    Electronic Resource
    Molecular weight distribution in polypropylene glycol 2025 (1963)
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A: General Papers 1 (1963), S. 1041-1048 
    Details
    ISSN: 0449-2951
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The new applications of polypropylene glycols as chemical intermediates, particularly in the polyurethane field, have shifted emphasis from purely physical properties, such as density, viscosity, and volatility, to chemical properties, such as hydroxyl content, unsaturation, and molecular weight: Because much interest is also being shown in the uniformity of chain length, i.e., the “molecular purity” of the polypropylene glycol, methods were investigated for measuring this property. A liquid chromatographic procedure has been developed which will yield molecular weight distributions for polypropylene glycols in the 2025 number-average molecular weight range. The results approximate, but do not match, the values obtained by theoretical calculations. Details of the method and a typical distribution curve are presented.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1963.100010317
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  • 5
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    Terrestrial impact melts as analogues for the hematization of Martian surface materials (1993)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Visible and near-IR reflectivity and Mossbauer data were obtained on powders of hydrothermally-altered impact melt sheets from West Clearwater Lake, Manicouagan, and Ries (Polsingen) impact structures. The data support previous interpretations that Martian bright regions spectra can be interpreted by a ferric-bearing phase that has a relatively featureless absorption edge together with some well-crystalline (bulk) hematite to account for the 860 nm hematite band. The data also show that bands at wavelengths longer than 900 nm, which are characteristic of Martian dark regions, occur when both hematite and pyroxene are present. It thus follows that hematization of Mars can be attributed, at least in part, to hydrothermal alterations of impact melt sheets. Impact heating could also form bulk-Hm from nanophase ferric oxides.
    Keywords: GEOPHYSICS
    Type: Lunar and Planetary Inst., Twenty-Fourth Lunar and Planetary Science Conference. Part 2: G-M; p 1015-1016
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 6
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    Combined Backscatter Moessbauer Spectrometer and X Ray Fluorescence analyzer (BaMS/XRF) for planetary surface materials (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: A backscatter Moessbauer spectrometer (BaMS) with included x ray fluorescence (XRF) capability for the Mars Environment Survey (MESUR) Mission, which has been proposed by NASA for 1998, is being developed. The instrument will also be suitable for other planetary missions such as those to the Moon, asteroids, and other solid solar-system objects. The BaMS would be unique for MESUR in providing information about iron mineralogy in rocks, clays, and other surface materials, including relative proportions of iron-bearing minerals. It requires no sample preparation and can identify all the normal oxidation states of iron (3+, 2+, 0). Thus, BaMS is diagnostic for weathering and other soil-forming processes. Backscatter design allows the addition of XRF elemental analysis with little or no modification. The BaMS/XRF instrument complements the thermal analyzer with evolved gas analyzer (TA-EGA) and the alpha-proton x-ray spectrometer (APXS) proposed (along with BaMS) for geochemical analysis on MESUR.
    Keywords: GEOPHYSICS
    Type: Program and Abstracts for Clay Minerals Society 28th Annual Meeting; p 1
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    UV, visible, and near-IR reflectivity data for magnetic soils/rocks from Brazil (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: The objective is to obtain UV, visible, and near-IR reflectivity spectra for several magnetic Brazilian soils/rocks and compare them to corresponding data for Mars to see if these materials satisfy both magnetic and spectral constraints for Mars. Selected physical properties of the magnetic Brazilian soils/rocks are presented. In general, the spectral features resulting from ferric crystal-field transitions are much better defined in the spectra of the magnetic Brazilian soils/rocks than in Martian spectral data. Presumably, this results from a relatively higher proportion of crystalline ferric oxides for the former. The apparent masking of the spectral signature of maghemite by hematite or goethite for the Brazilian samples implies the magnetic and spectral constraints for Mars can be decoupled. That is, maghemite may be present in magnetically-significant but optically-insignificant amounts compared to crystalline hematite.
    Keywords: GEOPHYSICS
    Type: Program and Abstracts for Clay Minerals Society 28th Annual Meeting; p 161
    Format: text
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    NASA TECHNICAL REPORTS
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