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  • 1
    Electronic Resource
    Electronic Resource
    Westerville, Ohio : American Ceramics Society
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Unusual droplet microaggregates are observed in TeO2-rich glasses of the systems TeO2–B2O3, TeO2–GeO2, TeO2–B2O3–GeO2, and TeO2–GeO2–V2O5. A decrease of the TeO2 content is established in the aggregates in comparison with the matrix. Their appearance is related to the process of metastable liquid-phase separation at high viscosity of the melts.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Structural changes are investigated which occur in mixtures of polyethylene with low and high density by radiation with γ-rays. It is established by electron microscopy that up to certain doses the rays cause structuring in the clean polymers and also in the mixtures. At greater radiation doses (10 Mrad) degradation and crazes are obtained. These processes are in direct dependance on the contents of the mixtures and are connected with their crystal structure. By X-ray investigations the change in the crystal structure of the mixture is studied. The destruction of the polymer chains is proved by IR-spectroscopy.
    Notes: Es wurden Strukturänderungen, die in Mischungen aus Polyäthylen mit niederer und hoher Dichte bei Bestrahlung mit γ-Strahlen auftreten, untersucht. Mit Hilfe der Elektronenmikroskopie wurde festgestellt, daß dieγ-Strahlen bis zu bestimmten Dosen eine Strukturierung bei den Reinpolymeren und deren Mischungen hervorrufen. Bei größeren Bestrahlungsdosen (10 Mrad) treten Abbau- und Rißbildungsprozesse auf. Diese Prozesse hängen von der Zusammensetzung der Mischung ab und sind mit der Kristallinität verbunden. Mittels röntgenographischer Untersuchungen wurde die änderung der Kristallinität studiert. Der Abbau der Polymerketten wird mittels IR-Spektroskopie bewiesen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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