Susanne Beißmann, Klemens Grabmayer, Gernot Wallner, David Nitsche, Wolfgang Buchberger,
"Analytical evaluation of the performance of stabilization systems for polyolefinic materials. Part II: Interactions between hindered amine light stabilizers and thiosynergists"
, in Polymer Degradation and Stability, Vol. 110, ELSEVIER, Seite(n) 509-517, 2014, ISSN: 1873-2321
Original Titel:
Analytical evaluation of the performance of stabilization systems for polyolefinic materials. Part II: Interactions between hindered amine light stabilizers and thiosynergists
Sprache des Titels:
Englisch
Original Kurzfassung:
In the present study, the applicability of high-performance liquid chromatography hyphenated with
highly sophisticated mass spectrometric detection (HPLC-MS) for analysis of hindered amine light stabilizers
(HALS), thiosynergists and their conversion products is demonstrated. Degradation pathways as
well as interactions between these stabilizer groups were successfully studied by analytical evaluation of
model formulations after accelerated aging in the polymer-mimicking solvent squalane. Binary mixtures
including HALS and thiosynergist as well as three component systems additionally including a phenolic
antioxidant were investigated. Results showed that transformation pathways of HALS are highly influenced
by the presence of sulfur-containing compounds and no aminoxyl radicals (typical reactive intermediates
of HALS) were observed in these mixtures. To get an understanding of the effect of this
altered stabilization mechanism on the protection of the polymer, rating of stabilization efficacies was
performed by comparing the amount of degradation products derived from squalane using different
formulations.
Forschungs-