This study aimed to investigate how an ultralow content of a molybdenum disulfide (MoS) two-dimensional particle affects the photodegradation mechanism of polystyrene (PS). Here, an accelerated weathering study was presented on neat polystyrene and its nanocomposites produced with 0.001, 0.002, 0.003 and 0.005 wt% of molybdenum disulfide (MoS) exposed for various irradiation intervals (up to 8 weeks). The polymer photo-transformations were monitored using size exclusion chromatography (SEC), infrared spectroscopy (FTIR), and UV-Vis spectroscopy. The FTIR and UV/Vis results indicate that the PS degradation mechanism was not altered by the presence of MoS particles; however, the degradation reactions were slowed down at higher MoS contents (>0.003%). The SEC results proved the stabilizer effect due to MoS particles, where M¯n, M¯w, and M¯w/M¯n values after 8 weeks were less modified when compared with the neat PS results. The MoS acted as a UV stabilizer, and these two-dimensional particles acted by deactivating the free radicals generated by the PS matrix, even considering the low amount of the filler (<0.005 wt%).
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10180763 | PMC |
| http://dx.doi.org/10.3390/polym15092099 | DOI Listing |
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