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  • 1
    Electronic Resource
    Electronic Resource
    Liquid crystalline polymers (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 735-741 
    Details
    ISSN: 1572-8943
    Keywords: copolyethers ; DSC analysis ; oxetane ; phase-transfer catalysis ; thermo-optometry ; thermotropic liquid crystalline polymers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The suitabilities of thermo-optometry and differential scanning calorimetry for the characterization of certain copolyethers were compared. Under certain conditions, such polymers do not exhibit the endotherm signal corresponding to the solid/liquid crystalline transition in the DSC curves. Thermo-optometry provides evidence of these phase transitions into the liquid crystalline state, and is a very useful additional method.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01981808
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  • 2
    Electronic Resource
    Electronic Resource
    New azomethine-urethanic compounds (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 238 (1996), S. 119-127 
    Details
    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: Durch Umsetzung von 2,2′-[Methylenbis(nitrilomethylidyn)]diphenol mit Toluylen-2,4-diisocyanat und Phenylisocyanat wurden neue Azomethin-Urethanverbindungen hergestellt, nämlich ein Polymeres bzw. dessen Modellverbindung. Die Produkte wurden mittels Elementaranalyse, IR- und NMR-Spektroskopie sowie Thermogravimetrie, DSC und Viskosimetrie charakterisiert. Beim Erhitzen dieser Verbindungen finden Umlagerungen statt, wobei sowohl Additions- als auch Kondensationsreaktionen ablaufen können, die zur Bildung thermostabiler Produkte, wahrscheinlich mit Hexahydrotriazin-Strukturen, führen.
    Notes: New azomethine-urethanic compounds were synthesized, starting from 2,2′-[methylenebis(nitrilomethylidyne)]diphenol and phenylisocyanate for the model compound and tolylene-2,4-diisocyanate for the polymer. The products were characterized by elemental analysis, IR and NMR spectroscopy as well as thermogravimetry, DSC and viscosimetry. Through heating, these compounds suffer chemical modification, both addition and condensation reactions being possible. Thermogravimetric studies have evidenced the formation of thermostable products, possibly due to hexahydrotriazinic structures resulted from the thermal treatment.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052380111
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Electrochemical polymerization of some monomers with schiff's base structure. A voltammetric study (1996)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 239 (1996), S. 1-12 
    Details
    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: Die elektrochemische Polymerisation von Pyrrol-2-aldehyd-azin, 2,2′-[1,4-Phenylenbis(nitrilomethylidyn)]dipyrrol und 2,2′-[1,4-Biphenylylenbis(nitrilomethylidyn)]dipyrrol läuft als anodische Fällungspolymerisation ab. Monomere und Polymere wurden voltammetrisch unter Verwendung von Platin- und “Paste-carbon”-Elektroden untersucht. Die Ergebnisse stimmen mit MO-Berechnungen überein, wobei die Reaktivität der Monomeren nach Hückel abgeschätzt wurde.
    Notes: The electrochemical polymerization of some Schiff's base-type monomers like pyrrole-2-aldehyde azine, N,N′-di(2-pyrrolylmethylene)-1,4-diaminobenzeneSystematic name: 2,2′-[1,4-phenylenebis(nitrilomethylidyne)]dipyrrole., and N,N′-di(2-pyrrolylmethylene)-4,4′-diaminobiphenylSystematic name: 2,2′-[4,4′-biphenylylenebis(nitrilomethylidyne)]dipyrrole. proceeds as a precipitating polymerization to the anodic compartment. The voltammetric study of monomers and polymers using Pt electrodes and paste-carbon electrodes were carried out. The results are in agreement with the MO calculations using the Hückel approximation for evaluating of the reactivity of the monomers.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1996.052390101
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    Paper (German National Licenses)
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