Summary
The photostabilizing effect of a hindered piperidine derivative was studied in the photooxidation of polypropylene films by following the formation of carbonyl and hydroperoxide groups, as well as the change of concentration of the stabilizer. This additive — the tetramethylpiperidine sebacate — proved to be more effective than hydroxybenzophenone, hydroxybenztriazole or a sulphur containing nickel complex, since no oxidation products were formed after irradiation with 20O Mlxh dose.
Addition of the piperidine derivative together with hydroxybenztriazole or with the organic nickel complex was less effective than with hydroxybenzophenone. In latter case concentration of both stabilizers under irradiation decreased at a slower rate than in the case of separate application. The effect of Cyasorb UV 531 and Tinuvin 770 was additive and the spontaneous rupture of the samples took place only after a long period of irradiation (∼ 250 Mlxh).
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Bálint, G., Kelen, T., Tüdös, F. et al. Effect of hindered piperidine derivatives on polypropylene photooxidation. Polymer Bulletin 1, 647–652 (1979). https://doi.org/10.1007/BF00254145
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DOI: https://doi.org/10.1007/BF00254145