Journal
MOLECULES
Volume 23, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/molecules23040913
Keywords
poly(vinyl chloride); photostability; Schiff bases; thiadiazole; average molecular weight; quantum yield; irradiation
Funding
- King Saud University
- Deanship of Scientific Research
- Research Chairs
- University of Baghdad
- Al-Nahrain University
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Five Schiff bases containing a thiadiazole moiety have been used as poly(vinyl chloride) photostabilizers at low concentrations. The efficiency of Schiff bases as photostabilizers was investigated using various techniques, for example, the changes in poly(vinyl chloride) infrared spectra, molecular weight, chain scission quantum yield, and surface morphology were monitored upon irradiation with an ultraviolet light. Evidently, all the additives used inhibited poly(vinyl chloride) photodegradation at a significant level. The most efficient Schiff base exhibited a high level of aromaticity and contained a hydroxyl group. It seems possible that such photostabilization could be due to the direct absorption of ultraviolet radiation by the additives. In addition, Schiff bases could act as radical scavengers and proton transfer facilitators to stabilize the polymeric materials.
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