Loss of stability by migration and chemical reaction of Santonox® R in branched polyethylene under anaerobic and aerobic conditions

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

“…For that purpose, two approaches can be envisaged: -Analytical methods: spectroscopic, chromatographic or thermal detection of stabilizer and its by-products [2,3]. The measurement of Oxidation Induction Time by DSC under oxygen is one of most popular methods because of its simplicity [4,5,6]. …”

“…We already obtained promising results in comparable studies for hydroperoxides decomposers [13,14] but it was in case of a major volatile loss so that it is not sure that the stabilizer depletion only due to chemical reaction is accurately simulated. Since Oxidation Induction Time measurement (by Chemiluminescence or DSC) is a commonly employed [4][5][6], we will try to discuss on the reliability of this method for determining the residual quantity of stabilizer in polymer after exposure.…”

Synthesis, characterization, and description of influences on the stabilizing activity of antioxidant-functionalized multi-walled carbon nanotubes

“…Two main mechanisms of stabilizer http://dx.doi.org/10.1016/j.carbon.2014.09.061 0008-6223/Ó 2014 Elsevier Ltd. All rights reserved. loss are distinguished: the first is physical loss, where the AO migrates to the surrounding medium and the second is chemical consumption [13,14]. Examples for physical loss are the contamination of drinking water in water pipeline systems and food through packaging [15,16].…”

“…Billingham reported that physical loss is more important than chemical consumption [13]. Additionally, Gedde et al found that in polyolefin hotwater pipes, oxidation of AOs was negligible compared to migration [14]. One approach used in irradiation cross-linked ultrahigh molecular weight polyethylene parts of endoprostheses is to use Vitamin E as antioxidant.…”

Process efficiency and long‐term performance of α‐tocopherol in film‐blown linear low‐density polyethylene

“…The oxidation started therefore on the surface and continued into the bulk. It has been shown that there is an equal distribution of antioxidants in a whole sample after longer aging times, 31 and this indicates that the surface and bulk are evenly degraded. After aging, PE had higher carbonyl absorbance in the bulk than on the surface.…”