The role of quinoid derivatives in the UV-initiated synergistic interaction mechanism of HALS and phenolic antioxidants
Maringer, L; Roiser, L; Wallner, G; Nitsche, D; Buchberger, W
| HERO ID | 4972398 |
|---|---|
| In Press | No |
| Year | 2016 |
| Title | The role of quinoid derivatives in the UV-initiated synergistic interaction mechanism of HALS and phenolic antioxidants |
| Authors | Maringer, L; Roiser, L; Wallner, G; Nitsche, D; Buchberger, W |
| Journal | Polymer Degradation and Stability |
| Volume | 131 |
| Page Numbers | 91-97 |
| Abstract | Within this work, UV-initiated interaction mechanisms between the phenolic antioxidant Irganox 1330 and nine commercially used hindered amine light stabilizers (HALS) were successfully studied using high-performance liquid chromatography (HPLC) coupled to UV and high-resolution mass spectrometric detection (MS). An analytical evaluation of the stabilizer performances in the polypropylene-mimicking solvent squalane revealed that all investigated HALS exhibited a strong synergism when combined with the phenolic antioxidant. Up to now, the synergistic interaction was described as a result of the hydrogen transfer from a hydroxylamine derived from HALS to the oxidized form of a primary antioxidant, whereby the phenol is regenerated. Investigations on degradation products, however, indicated that the proposed interaction mechanism cannot be applied to a sterically hindered phenol such as Irganox 1330. Instead, a completely new stabilization mechanism of phenolic antioxidants in the presence of HALS, involving the formation of quinoid derivatives, was discovered and confirmed by using a model compound. (C) 2016 Elsevier Ltd. All rights reserved. |
| Doi | 10.1016/j.polymdegradstab.2016.07.007 |
| Wosid | WOS:000382408100010 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Keyword | HALS; Phenolic antioxidants; Synergism; UV aging; Quinoid; UV-absorber; High-performance liquid chromatography; Mass spectrometry; NMR |