Modelling light stabilizers as thermal antioxidants

Polyethylene stabilization against thermal oxidation by a trimethylquinoleine oligomer

“…6b), seem to be characteristic of Hindered Amine Stabilizer. The oxidation rate dependence on stabilizer concentration observed in this work is comparable to the oxidation rate dependence on initial amount of HAS observed by Zeynalov and Allen [16] (in the case of externally initiated thermal oxidation of cumene) and also suggested in the case of PP photo-oxidation by Delprat et al [17], and Kó sa et al [18]. Nevertheless, these features cannot be considered as rigorous evidences for the TMQ assignment.…”

“…t ind /x TMQ values are scattered around 10 000 h % À1 . The maximum rate of carbonyl build-up decreases with the TMQ concentration, that is not the case for phenolic antioxidants, as observed by Zeynalov and Allen [16] for Cyanox UV 2098 (a long chain alkanoate substituted di-tert-butylphenol). It seems reasonable to assume that this is also true for Irganox 1010.…”

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

“…2 and Kinetic curves for carbonyl build-up display the classical quasi-sigmoidal shape. The changes of maximal oxidation rate with the initial stabilizer concentration are significantly lower in case of phenolic antioxidant (for example in PP [23], squalane [39] or cumene [40] consistently with the fact that phenols behave as sacrificial stabilizers i.e. that induction period ends when all stabilizing species are totally consumed) than in the case of HAS where stabilizing by-products remain efficient even after the end of induction period [41] which induces a decrease of maximal oxidation rate when increasing the HAS concentration [39,42].…”

Study of Antioxidant Effectiveness of Kraft Lignin in HDPE

“…A further increase of in the mixture of HDPE made with I1010 is also observed in Figure 4, which was attributed to the antioxidant trade having a less complex structure as compared with the structure of lignin, a property that allows them to be inserted into only part of the polymer surface by having a smaller molecular weight, forming a protective monolayer (as discussed elsewhere [1,[7][8][9]20]), which provides greater in a shorter time.…”

“…This study is related to the temperature dependence and the induction period (IP), which may depend on the Arrhenius equation (as discussed elsewhere [4][5][6][7][8][9]):…”