Summary
UV-spectra of degraded PVC are put together in a complicated but surveyable way by superposition and deletion of the a-, b-, c-, and d-absorptions of individual polyenes. The existing conception according to which all maxima are based on the most intensive longest-wave d-absorption of a definite polyene sequence could not be confirmed. It has been established that all spectra are showing clearly two additional maxima resulting from a superposition of other polyene absorptions. Thus, counting all maxima for d-absorptions, in the literature a wrong assignment of the UV-maxima to the individual polyenes is reported.
Furtheron, it is shown that the frequency distribution of the polyene sequence length is not influenced by the extent of PVC-degradation, but is mainly depending on the degradation temperature.
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Braun, D., Sonderhof, D. Assignment of UV-absorption maxima of degraded PVC. Polymer Bulletin 14, 39–43 (1985). https://doi.org/10.1007/BF00254913
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DOI: https://doi.org/10.1007/BF00254913