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  • 1
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Based on solvatochromic effects empirical polarity scales for solvents can be derived. Correspondingly, five organic test substances of the donor-acceptor type were added to 21 different film-forming organic polymers and the UV-VIS spectra were evaluated. The absorption maxima of these substances were found to shift bathochrom with increasing polarity of the binding agent. The solvatation in solvents and solid matrices were compared in order to establish relative polarity values of the polymers.
    Notes: Auf der Basis von Solvatochromie-Effekten lassen sich empirische Polaritätsskalen für Lösungsmittel ableiten. In Analogie dazu wurden fünf organische Testsubstanzen vom Donator-Acceptor-Typ in 21 verschiedene filmbildende organische Polymere eingebracht und UV-VIS-spektroskopisch vermessen. Die Absorptionsmaxima dieser Substanzen verschieben sich mit zunehmender Polarität des Bindemittels bathochrom. Die Solvent-Effekte in Lösungsmitteln und in festen Matrizen werden verglichen, um so relative Polymer-Polaritätswerte zu gewinnen.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 7 (1968), S. 360-370 
    ISSN: 0570-0833
    Keywords: Nitrides ; Phosphides ; Arsenides ; Lithium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Ternary phases have been prepared from lithium, another metal, and nitrogen, phosphorus, or arsenic. The ternary compounds, in particular the nitrides, are thermally more stable than the binary compounds. The lithium gives rise to a relatively high polar bonding component. At high temperatures, lithium and the second metal are often randomly distributed among the interstices of the metalloid lattice. The ordering processes that take place with decreasing temperature are investigated by X-ray and magnetic methods and by differential thermal analysis. The phases are classified on a structural basis into seven groups.
    Type of Medium: Electronic Resource
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