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  • 1
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Nuclear Inst. and Methods in Physics Research, B 91 (1994), S. 659-662 
    ISSN: 0168-583X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Journal of Magnetism and Magnetic Materials 31-34 (1983), S. 937-938 
    ISSN: 0304-8853
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-1536
    Keywords: Adsorption ; γ-Fe2O3 ; dispersibility ; orientation ; packing density ; magnetic coatings ; polymers havingphosphoricacid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Polymers having phosphoric acid groups were prepared as a model binder for magnetic coatings, and the correlation among the adsorption behavior of the polymers ontoγ-Fe2O3 particles and the dispersibility, the orientation, and the packing density ofγ-Fe2O3 particles in the magnetic coatings was investigated. PMMA homopolymer molecules hardly adsorbed onγ-Fe2O3, and the interfacial tension at a water/polymer solution (toluene) interface (γ W/T) was scarcely changed compared with a water/toluene interface. Increasing with the content of polymeric phosphoric acid group, the adsorbance of polymer increased and the interfacial tension (γ W/T) decreased. When the content of polymeric phosphoric acid groups was over 0.4 mol%, the adsorbance of polymer and interfacial tension (γ W/T ) remained constant. When these polymers were used as a binder for magnetic tapes, the dispersibility ofγ-Fe2O3 in the magnetic coatings was improved, increasing with the content of polymeric phosphoric acid group; however, when the content of phosphoric acid group was over 0.2 mol%, its dispersibility decreased abruptly.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0306-042X
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Macroions of lysozyme and polystyrene produced by the electrospraying of dilute solutions of these macromolecules into nitrogen gas at atmospheric pressure have been studied by means of the measurement of their mobilities in nitrogen by means of an ion-drift spectrometer. In the case of polystyrene mainly clusters of negative macroions have been detected and studied, but in the case of lysozyme macroions containing one, two or three positive charges can be identified. The effect of change of solution concentration, temperature and pressure in the ion-drift tube on the data obtained in the case of polystyrene has been observed.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 75 (1964), S. 1-10 
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Es wurde eine Reihe von Versuchen durchgeführt, um die Gültigkeit der Annahme eines einfachen Reihen-Modells für die Berechnung des Elastizitätsmoduls der kristallinen Bereiche in orientierten linearen Polymeren mit Hilfe der röntgenographischen Messungen der Gitterdehnung zu beweisen. Von verschiedenen Proben wie Fäden, Fasern und Filmen von Polyäthylen, Polyvinylalkohol, Polypropylen, Polyoxymethylen und Cellulose wurden die Kraft-Dehnungskurven unter der obigen Annahme konstruiert und die Werte des Moduls miteinander verglichen. Trotz des Unterschiedes zwischen den Mikrostrukturen dieser Proben erhielt man fast den gleichen Gittermodul bei jedem dieser Polymeren. Die großen Unterschiede zwichen den makroskopischen Moduln der Proben hatten keinen Einfluß auf den Gittermodul. Die Gittermoduln von trockenem und mit Wasser gequollenem Polyvinylalkohol oder auch Cellulose unterschieden sich nicht voneinander. Diese Ergebnisse stellen eine starke Stütze für die oben erwähnte Annahme dar.Ferner wird die Dehnungsfähigkeit der verschiedenen Polymer-Moleküle diskutiert.
    Notes: Some experiments were carried out to prove the validity of the assumption of a simple series model for the calculation of the elastic modulus of crystalline regions in oriented linear polymers from X-ray determination of lattice extension. Various specimens such as filaments, fibers, and films were prepared from polyethylene, polyvinyl alcohol, polypropylene, polyoxymethylene and cellulose, stress-strain curves constructed under the assumption of a simple series model; and calculated values of modulus compared. In spite of the differences of microstructures of these specimens, nearly the same value for the lattice modulus was obtained for each polymer. A large difference of specimen moduli had no effect on the lattice modulus. Lattice moduli of dry and water-swollen polyvinyl alcohols or cellulose did not differ from each other. These results are a strong support for the above assumption.Extensibility of various polymer molecules was also discussed.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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