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Eingeladener Vortrag
- nein (46)
Chemiluminescence (CL) is a sensitive method of investigating the thermo-oxidative stability of polymers in the early stages of degradation. Therefore, CL measurements were applied to different automotive coatings to evaluate their degradation behavior during artificial weathering. In this work, CL measurements were carried out for different automotive coatings to follow their degradation behavior during artificial weathering. The CL emission depends on sample-specific parameters like stabilizer, matrix, or hardener; experimental parameters like the oxygen partial pressure; and exposure parameters like the duration of weathering. The potential of CL could be demonstrated by classifying materials into categories of good, medium, and low degradation performance at a much earlier stage of weathering exposure than in combination with the usual visual detection of weathering effects.
Thermally stimulated luminescence (TL) can be used to detect damage in the early stages of degradation after artificial weathering, and to analyze the efficiency of stabilizers used in automotive coatings. TL is particularly suitable for this task due to its inherent high sensitivity to structural, morphological, and chemical changes in macromolecular chains. In this work, TL measurements were carried out for different automotive coatings to follow their degradation progression during artificial weathering. The TL results demonstrate high sensitivity to parameters like stabilizers, matrices, hardeners, and weathering time, and provide an opportunity to monitor the early stages of damage in polymers, which therefore reduce the time required for further outdoor weathering tests.
Im Mittelpunkt dieser Arbeit stehen die konjugierten Polymere, die sich durch äußerst interessante elektrooptische Eigenschaften auszeichnen. Die sich daraus ergebenden Anwendungen liegen vor allem auf dem Gebiet der Elektrolumineszenz, z. B. als LED- Materialien. Ein Hauptproblem für die Einsatzfähigkeit ist die Stabilität der konjugierten Polymere. Dabei spielen Oxida-tionsprozesse sowie strukturelle und morphologische Veränderungen eine entscheidende Rolle. Zur Untersuchung der thermooxidativen Stabilität wurde die Chemilumineszenz-Methode (CL) und zum Nachweis der strukturellen und morphologischen Defekte die Thermolumineszenz-Methode (TL) eingesetzt. Um die Stabilität der konjugierten Polymere zu erhöhen, wurden im Rahmen dieser Arbeit zahlreiche Einflussfaktoren auf die thermooxidative Stabilität sowie auf die molekulare Beweglichkeit mit Hilfe der CL und der TL untersucht und diskutiert.
The thermo-oxidative degradation of a polymeric optical cable is investigated by chemiluminescence, The results are reliable and reproducible. Two distinct processes are reported marked by a peak and a plateau behavior versus the time, respectively. Both processes are ruled by thermally activated processes. Beside the dependencies of temperature and time, the influence of absorbed water is discussed. Chemiluminescence is proposed as a promising candidate for a suitable testing method assessing the thermo-oxidative stability of plastic optical fibers and cables. it requires not more than a simple one-day testing procedure and has the advantage that it can be carried out even within the lo cv temperature ranges of the cables' intended use.