Polyethylene stabilization against thermal oxidation by a trimethylquinoleine oligomer

Richaud, Emmanuel; Colin, Xavier; Monchy-Leroy, C.; Audouin, L.; Verdú, J.

doi:10.1016/j.polymdegradstab.2008.11.018

Cited by 15 publications

(12 citation statements)

References 40 publications

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“…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].…”

Section: Oxidation At Solid Statementioning

confidence: 78%

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Richaud¹

2013

European Polymer Journal

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Section: Oxidation At Solid Statementioning

confidence: 78%

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Richaud¹

2013

European Polymer Journal

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“…It has been used for a long time as a heat stabilizer and antioxidant with some anti-flex-crack effect in the rubber industry and in polyolefins [28]. pTMQ is generally more efficient than other common antioxidants in protecting against irradiation aging and thermal oxidation below 150 °C [29]. Abstraction of the hydrogen atom from the -NH group of TMQ according to Reaction (5) is the primary step of the antioxidant action [21].…”

Section: Discussionmentioning

confidence: 99%

Quantitative analysis of changes in antioxidant in crosslinked polyethylene (XLPE) cable insulation material exposed to heat and gamma radiation

Liu

Veysey

Fifield

et al. 2018

Polymer Degradation and Stability

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Quantitative analysis of the antioxidant poly(1,2-dihydro-2,2,4-trimethylquinoline) (pTMQ) was conducted on pristine, thermally-aged, and gamma radiation-aged commercial cross-linked polyethylene-(XLPE-)based cable insulation material aged at temperatures 60, 90, and 115 °C, with gamma radiation exposure dose rates of 0, 120, 300, and 540 Gy/h for 15 days. The quantification of antioxidant was performed using pyrolysis gas chromatography-mass spectrometry (Py-GCMS). Oxidation induction time (OIT) was measured using differential scanning calorimetry (DSC) and correlation was made between the quantified depletion of antioxidant and measured OIT. It was observed that, in the case of isothermal aging, the quantity of antioxidant and OIT decreased with increasing gamma radiation dose. In the case of samples exposed to the same gamma radiation dose, the quantity of antioxidant and OIT were observed to decrease with increasing aging temperature. Depletion in the quantity of antioxidant relative to that in the pristine material ranged from 7 to 93% for differently aged samples. The measured decline in OIT ranged from 0 to 80%. Change in the quantity of antioxidant in the material was observed to follow the same trend as the change in OIT when the samples were aged under various conditions. The observations are explained in terms of the reaction between the antioxidant and free radicals created during exposure of the samples to thermal and gamma radiation. AbstractQuantitative analysis of the antioxidant poly(1,2-dihydro-2,2,4-trimethylquinoline) (pTMQ) was conducted on pristine, thermally-aged, and gamma radiation-aged commercial cross-linked polyethylene-(XLPE-)based cable insulation material aged at temperatures 60, 90, and 115 °C, with gamma radiation exposure dose rates of 0, 120, 300, and 540 Gy/h for 15 days. The quantification of antioxidant was performed using pyrolysis gas chromatography-mass spectrometry (Py-GCMS). Oxidation induction time (OIT) was measured using differential scanning calorimetry (DSC) and correlation was made between the quantified depletion of antioxidant and measured OIT. It was observed that, in the case of isothermal aging, the quantity of antioxidant and OIT decreased with increasing gamma radiation dose. In the case of samples exposed to the same gamma radiation dose, the quantity of antioxidant and OIT were observed to decrease with increasing aging temperature. Depletion in the quantity of antioxidant relative to that in the pristine material ranged from 7 to 93 % for differently aged samples. The measured decline in OIT ranged from 0 to 80 %. Change in the quantity of antioxidant in the material was observed to follow the same trend as the change in OIT when the samples were aged under various conditions, with a correlation coefficient of 0.82. The observations are explained in terms of the reaction between the antioxidant and free radicals created during exposure of the samples to thermal and gamma radiation.

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“…These are typically hydroperoxide decomposers or peroxy radical scavengers such as hindered phenols. This is in contrast to "regenerative" stabilizers such as hindered amine-based ones [27,28].…”

Section: Carbonyl Formationmentioning

confidence: 92%

Modelling of thermal oxidation of phosphite stabilized polyethylene

Djouani

Richaud

Fayolle

et al. 2011

Polymer Degradation and Stability

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Modelling of thermal oxidation of phosphite stabilized polyethylene. Polymer Degradation and Stability, Elsevier, 2011, 96 (7), pp. a b s t r a c tThe thermal oxidation behaviour of polyethylene films stabilized by various weight ratios of organophosphites (Irgafos 168) has been studied at selected temperatures. The duration of the induction period was found to increase proportionally with the stabilizer concentration, even at temperatures as low as 80 C. Particular attention was paid to the phosphiteephosphate conversion during the induction period. A kinetic model, involving volatile and partially soluble hydroperoxide decomposers, was developed in order to simulate these results. With the use of kinetic parameters that can be at least tentatively justified from theoretical considerations, this model gave simulations in reasonable agreement with the experimental observations for stabilizer depletion and carbonyl formation. Of particular note is the fact that, even for non-trivial results such as the shape of the phosphite versus phosphate concentration plots, or phosphate build-up, there was also a quite good agreement.

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Polyethylene stabilization against thermal oxidation by a trimethylquinoleine oligomer

Cited by 15 publications

References 40 publications

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Kinetic modelling of phenols consumption during polyethylene thermal oxidation

Quantitative analysis of changes in antioxidant in crosslinked polyethylene (XLPE) cable insulation material exposed to heat and gamma radiation

Modelling of thermal oxidation of phosphite stabilized polyethylene

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