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  • Polymer and Materials Science  (1)
  • materials synthesis  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Research Needs Assessment on Nanostructured Catalysts (1997)
    Springer
    Journal of electroceramics 1 (1997), S. 219-238 
    Details
    ISSN: 1573-8663
    Keywords: nanocrystal ; nanoporous ; molecular sieve ; catalysis ; materials synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Nanocrystalline and nanoporous materials with uniquecharacteristics have attracted a great deal of research interest in the pastdecade. This paper discusses the latest advances in nanostructure processingwhich enable us to better control surface area, cluster size, grainmorphology, pore structure, component dispersion, phase distribution, anddefect concentration to engineer advanced catalysts with significantlyimproved reactivity and selectivity. Areas deserving further research toexplore and realize the full potential of nanostructured catalytic materialsare presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009931726749
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation and characterization of cyclic poly(oxypropylene) (1997)
    Weinheim : Wiley-Blackwell
    Macromolecular Rapid Communications 18 (1997), S. 1085-1093 
    Details
    ISSN: 1022-1336
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Poly(propylene glycol) [α-hydro-ω-hydroxypoly(oxypropylene)] of number-average molar mass M̄n ≈ 2000 g · mol-1 (PPG2000) was cyclised with high conversion (ca. 75%) by reaction with dichloromethane in the presence of powdered KOH. The cyclic product was separated from chain extended polymer by preparative GPC, giving an overall yield of polymer (M̄n ≈ 2000 g · mol-1, narrow molar mass distribution) in excess of 50%. Characterisation by analytical GPC and 13C NMR spectroscopy confirmed cyclisation. DEPT and 1H-coupled NMR spectra were used to show that the links in cyclic poly(oxypropylene) were 77% single acetal, 12% double acetal and 11% triple acetal (or higher). This complexity probably results from competitive reaction with water introduced with KOH.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/marc.1997.030181212
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