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  • Chemistry  (3)
  • Wiley-Blackwell  (3)
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  • Wiley-Blackwell  (3)
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  • 1
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Acta Polymerica 47 (1996), S. 436-440 
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We report detailed measurements on the thermal conversion of the tetrahydrothiophene prepolymer to poly(p-phenylene vinylene) (PPV) and show the influence of the elimination conditions on the properties of PPV and on light emitting devices (LEDs) prepared in the configuration ITO/PPV/Al. Electroluminescence correlates with a diode behavior in the current - voltage characteristic and can be observed for PPV heated at a minimum temperature of 130°C. Increase of the elimination temperature results in a red-shift of both the photoluminescence and electroluminescence spectra by ≈10 nm, which enables us to control the color of our LEDs in a small range. We have observed that refered to the brightness of the devices the optimum elimination temperature is 160°C, and we show that a further increase of temperature does not improve the properties of PPV- LEDs.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0323-7648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: We report on detailed measurements of the elimination reaction of poly(p-phenylene vinylene) (PPV) prepared by the precursor route. The influence of the temperature on the conversion was investigated by optical absorption measurements. Compared to the elimination reaction in vacuum we find that the temperature necessary for the elimination reaction is remarkably reduced if carried out in a proper exchange gas. As a result, we have prepared the first flexible light emitting diodes (LEDs) of PPV on polymer foil substrates.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
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  • 3
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Biochemical and Microbiological Technology and Engineering 1 (1959), S. 261-271 
    ISSN: 0368-1467
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: During the biosynthetic production of chlortetracycline on a medium with sucrose, soy meal, corn steep extract, sodium chloride, ammonium sulphate, calcium carbonate and beet molasses, the amount of nucleic acids synthesized by the culture and the maximum respiration of the culture is determined by the amount of inorganic phosphate in the original medium. Chlortetracycline production does not start until all the inorganic phosphate has been consumed. The adverse influence of increased amounts of inorganic phosphate upon production of chlortetracycline is more apparent in flasks on a shaking machine than in agitated and aerated fermentation tanks with higher oxygen transfer numbers.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Limitation Availability
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