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  • Electronic Resource  (2)
  • 1970-1974  (2)
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  • Electronic Resource  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    A new approach to the determination of crystallinity of polymers by X-ray diffraction (1973)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 6 (1973), S. 225-230 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: A new X-ray diffraction method for the determination of crystallinity of polymers is reported. A probability function is used to express the intensity distribution of an amorphous halo. The intensity of the halo buried under any crystalline peak can be calculated by this function. An amorphous-standard-addition method was used to determine crystallinity. A linear relationship between intensity and concentration is derived theoretically and applied to polyethylene terephthalate. No previous chemical or structural information about the polymer is necessary for this method. Very good agreement between X-ray data and density measurements were obtained. This method is rapid, practical and suitable for routine analysis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889873008514
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Vacuum sublimation and crystallography of quinacridones (1971)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 4 (1971), S. 506-511 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Quinacridones are pigments of outstanding light, heat and chemical fastness. Single crystals of linear unsubstituted quinacridone and 4,11-dichloroquinacridone were grown by the vacuum sublimation method at about 425°C and 390°C respectively under a vacuum of 0.3 torr. The sublimation products are always γ-form quinacridone and β-form 4,11-dichloroquinacridone no matter what respective polymorphic forms are used as the starting material. Exothermic effects at transition temperatures were observed for both materials on heating by TGA and DSC techniques. The space groups and unit-cell dimensions were determined by the precession method. The powder patterns are indexed by single-crystal data. The size, shape, and orientation of the molecules as well as the general structure features are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889871007544
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
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