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  • 1
    Electronic Resource
    Electronic Resource
    Untersuchungen zur Matrixmorphologie von phenolharzgebundenen Cellulosepapier-Schichtpreßstoffen (1990)
    Weinheim : Wiley-Blackwell
    Acta Polymerica 41 (1990), S. 273-279 
    Details
    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: By transmission electron microscopy, globular structures were observed on the fracture surface of the phenolic resin matrix. From water diffusion experiments the existence of a layer between the globules with a lower network density can be deduced. When the resin is modified by NBR or by tung oil combined with tricresyl phosphate, two separated phases are indicated by dynamic mechanical analysis, by thermally stimulated depolarization measurements, and by TEM.
    Notes: Auf Matrixbruchflächen werden mittels Transmissionselektronenmikroskopie globulare Strukturen beobachtet. Aus Untersuchungen zur Wasserdiffusion kann auf eine Zwischenschicht mit geringerer Vernetzungsdichte geschlossen werden. Ist die Harzmatrix mit NBR-Kautschuk oder mit Holzöl in Kombination mit Tricresylphosphat modifiziert, so weisen die dynamisch-mechanische Analyse, Messungen der thermisch stimulierten Depolarisation und TEM-Untersuchungen auf zwei separierte Phasen hin.
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/actp.1990.010410503
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Colourless, transparent conductive polymer films with ultrathin networks of organic crystals (1996)
    New York, NY [u.a.] : Wiley-Blackwell
    Advanced Materials for Optics and Electronics 6 (1996), S. 330-334 
    Details
    ISSN: 1057-9257
    Keywords: conductive composites ; organic metals ; BEDO-TTF ; nanocrystals ; polymer composites ; optical properties ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Physics
    Notes: The possibilities of increasing the transparency of conductive organic polymeric composites obtained by growing crystalline conductive networks in situ are discussed and new methods of preparation of practically colourless conductive polymer films are presented. We show that in most cases the colour which appears during the preparation of a conducting composite by reticulate doping is not directly related to the conducting network, which usually consist of relatively well-formed microcrystals, but results instead from the additive molecules present in the polymer matrix as less organised aggregates or a molecularly dispersed phase. By an appropriate choice of preparation conditions or electrochemically one can get rid of the strongly absorbing part of the complex so that the absorption in the visible range can be substantially reduced without losing conductivity and without deterioration of the conductive network.These phenomena are demonstrated on polycarbonate with fine networks of BEDO-TTF iodine and bromine salts obtained by casting or spin coating in order to obtain thin homogeneous films, e.g. to prepare electrodes for electro-optical investigations. Transparent, colourless conductive films 20-2 μm thick (surface resistivity of the order of 103-104 Ω/□) have been obtained and the structure of the conductive networks in these materials, their optical properties in the visible and near-infrared range as well as their electrical properties are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
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