Evaluation of long‐term performance of antioxidants using prooxidants instead of thermal acceleration

Abstract

Evaluation of stabilization efficiencies of different antioxidants in polymers at low temperature and relatively short time was performed using incorporation of a prooxidant for catalytic oxidation. Comparisons were made between polypropylene films stabilized with primary antioxidants (Irganox 1076, Irganox 1010, and α‐tocopherol), with or without the prooxidant manganese stearate at different temperatures. A faster degradation was obtained in the presence of a prooxidant than without it. The relative efficiency of the antioxidants at prooxidant acceleration correlated better to low temperature long‐term test than at the thermal acceleration. The results were affected by initial differences in the amounts of the antioxidants present after the processing of the films. These differences were corrected for by a recalculation using microwave‐assisted extraction (MAE) and high performance liquid chromatography analysis from the exponential decrease in the amount of antioxidant in the films. The fastest comparison of the antioxidants efficiency was obtained from oxidation induction times, using total luminescence intensity measurements, but reliable results could also be obtained from the time to apparent failure. © 2005 Wiley Periodicals,Inc. J Polym Sci Part A: Polym Chem 43: 4537–4546, 2005

Accelerating the degradation of polyolefins through additives and blending

“…33,63 Different kinds of metal ion complexes were referenced in a recent review article. 1 Stearate complexes of transition metals, such as zinc stearate, 59,64 CoSt, 65,66 manganese stearate (MnSt), 67 titanium stearate, 63 and chromium stearate, or alkaline earth metals, such as magnesium stearate 68 and calcium stearate (CaSt), 64,67,69 have been studied widely. Some inorganic degradation agents recently used in polyolefins are presented in Table I.…”

Chitosan conjugated with deoxycholic acid and gallic acid: A novel biopolymer‐based additive antioxidant for polyethylene

“…12,13 Its long-term performance in the polymer product, as compared to those of synthetic antioxidants (e.g., Irganox 1076), are points to be overcome. 14,15 Polymer-based stabilizers bring higher thermal stability, more resistance to extraction, and lower toxicity as compared to the small molecules. For example, Ranogajec and Mišak 16 prepared UV-protector (2-hydroxy-4-(3-methacryloxy-2-hydroxy-propoxy) benzophenone)-grafted polyethylene to increase the persistence of the stabilizer in the polymer matrix.…”

Migration Studies and Endocrine Disrupting Activities: Chemical Safety of Cosmetic Plastic Packaging

“…C1 or 2,4-di-tert-butylphenol (2,4 DTBP), C2 or 7,9-di-tert-butyl1-oxaspiro(4,5)deca-6,9diene-2,8-dione (7,9 DTBO), and C7 or 3,5-di tert-butyl-4-hydroxybenzaldehyde (3,5 DTBH) were NIAS likely coming from the degradation of antioxidants such as Irgafos 168 for C1 [44] or Irganox 1010 for C2 and C3 [39,45]. 2,4 DTBP was detected as an extractable or leachable NIAS in several studies, associated with PP and PE [46,47], but also with PET and HDPE materials [48,49]. Previous studies found high concentrations of 2,4-DTBP in food packaging materials [41].…”